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GitHub - mjansson/rpmalloc: Public domain cross platform lock free thread caching 16-byte aligned memory allocator implemented in C
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0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"github_copilot","context":"product","tag":"link","label":"github_copilot_link_product_navbar"}" href="https://github.com/features/copilot"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" 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0 0 1 0 1.5h-.5a.75.75 0 0 1-.75-.75Z"></path> </svg> <div> <div class="color-fg-default h4">Codespaces</div> Instant dev environments </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"issues","context":"product","tag":"link","label":"issues_link_product_navbar"}" href="https://github.com/features/issues"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-issue-opened color-fg-subtle mr-3"> <path d="M12 1c6.075 0 11 4.925 11 11s-4.925 11-11 11S1 18.075 1 12 5.925 1 12 1ZM2.5 12a9.5 9.5 0 0 0 9.5 9.5 9.5 9.5 0 0 0 9.5-9.5A9.5 9.5 0 0 0 12 2.5 9.5 9.5 0 0 0 2.5 12Zm9.5 2a2 2 0 1 1-.001-3.999A2 2 0 0 1 12 14Z"></path> </svg> <div> <div class="color-fg-default h4">Issues</div> Plan and track work </div> </a></li> <li> <a 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0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"github_skills","context":"product","tag":"link","label":"github_skills_link_product_navbar"}" href="https://skills.github.com"> GitHub Skills <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 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</div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button 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seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" 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General Purpose Memory Allocator\u003c/h1\u003e\u003ca id=\"user-content-rpmalloc---general-purpose-memory-allocator\" class=\"anchor\" aria-label=\"Permalink: rpmalloc - General Purpose Memory Allocator\" href=\"#rpmalloc---general-purpose-memory-allocator\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis library provides a public domain cross platform lock free thread caching 16-byte aligned memory allocator implemented in C. The latest source code is always available at \u003ca href=\"https://github.com/mjansson/rpmalloc\"\u003ehttps://github.com/mjansson/rpmalloc\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCreated by Mattias Jansson (\u003ca href=\"https://twitter.com/maniccoder\" rel=\"nofollow\"\u003e@maniccoder\u003c/a\u003e) - Discord server for discussions at \u003ca href=\"https://discord.gg/M8BwTQrt6c\" rel=\"nofollow\"\u003ehttps://discord.gg/M8BwTQrt6c\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePlatforms currently supported:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eWindows\u003c/li\u003e\n\u003cli\u003eLinux\u003c/li\u003e\n\u003cli\u003eMacOS\u003c/li\u003e\n\u003cli\u003eiOS\u003c/li\u003e\n\u003cli\u003eAndroid\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe code should be easily portable to any platform with atomic operations and an mmap-style virtual memory management API. The API used to map/unmap memory pages can be configured in runtime to a custom implementation and mapping granularity/size.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis library is put in the public domain; you can redistribute it and/or modify it without any restrictions. Or, if you choose, you can use it under the MIT license.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePerformance\u003c/h1\u003e\u003ca id=\"user-content-performance\" class=\"anchor\" aria-label=\"Permalink: Performance\" href=\"#performance\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe believe rpmalloc is faster than most popular memory allocators like tcmalloc, hoard, ptmalloc3 and others without causing extra allocated memory overhead in the thread caches compared to these allocators. We also believe the implementation to be easier to read and modify compared to these allocators, as it is a single source file of ~2200 lines of C code. All allocations have a natural 16-byte alignment.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eContained in a parallel repository is a benchmark utility that performs interleaved unaligned allocations and deallocations (both in-thread and cross-thread) in multiple threads. It measures number of memory operations performed per CPU second, as well as memory overhead by comparing the virtual memory mapped with the number of bytes requested in allocation calls. The setup of number of thread, cross-thread deallocation rate and allocation size limits is configured by command line arguments.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/mjansson/rpmalloc-benchmark\"\u003ehttps://github.com/mjansson/rpmalloc-benchmark\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBelow is an example performance comparison chart of rpmalloc and other popular allocator implementations, with default configurations used.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://camo.githubusercontent.com/6900574878fd378a4914f91e8414c9c8d8e698ad819edde31aa2a12a38249e3a/68747470733a2f2f646f63732e676f6f676c652e636f6d2f7370726561647368656574732f642f314e574e756172317a3075504342356956535f43733668536f3278506b546d5a66304b736757535f46625f342f70756263686172743f6f69643d33303130313738373726666f726d61743d696d616765\"\u003e\u003cimg src=\"https://camo.githubusercontent.com/6900574878fd378a4914f91e8414c9c8d8e698ad819edde31aa2a12a38249e3a/68747470733a2f2f646f63732e676f6f676c652e636f6d2f7370726561647368656574732f642f314e574e756172317a3075504342356956535f43733668536f3278506b546d5a66304b736757535f46625f342f70756263686172743f6f69643d33303130313738373726666f726d61743d696d616765\" alt=\"Ubuntu 16.10, random [16, 8000] bytes, 8 cores\" data-canonical-src=\"https://docs.google.com/spreadsheets/d/1NWNuar1z0uPCB5iVS_Cs6hSo2xPkTmZf0KsgWS_Fb_4/pubchart?oid=301017877\u0026amp;format=image\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe benchmark producing these numbers were run on an Ubuntu 16.10 machine with 8 logical cores (4 physical, HT). The actual numbers are not to be interpreted as absolute performance figures, but rather as relative comparisons between the different allocators. For additional benchmark results, see the \u003ca href=\"/mjansson/rpmalloc/blob/develop/BENCHMARKS.md\"\u003eBENCHMARKS\u003c/a\u003e file.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eConfiguration of the thread and global caches can be important depending on your use pattern. See \u003ca href=\"/mjansson/rpmalloc/blob/develop/CACHE.md\"\u003eCACHE\u003c/a\u003e for a case study and some comments/guidelines.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRequired functions\u003c/h1\u003e\u003ca id=\"user-content-required-functions\" class=\"anchor\" aria-label=\"Permalink: Required functions\" href=\"#required-functions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBefore calling any other function in the API, you \u003cstrong\u003eMUST\u003c/strong\u003e call the initialization function, either \u003cstrong\u003erpmalloc_initialize\u003c/strong\u003e or \u003cstrong\u003erpmalloc_initialize_config\u003c/strong\u003e, or you will get undefined behaviour when calling other rpmalloc entry point.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBefore terminating your use of the allocator, you \u003cstrong\u003eSHOULD\u003c/strong\u003e call \u003cstrong\u003erpmalloc_finalize\u003c/strong\u003e in order to release caches and unmap virtual memory, as well as prepare the allocator for global scope cleanup at process exit or dynamic library unload depending on your use case.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsing\u003c/h1\u003e\u003ca id=\"user-content-using\" class=\"anchor\" aria-label=\"Permalink: Using\" href=\"#using\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe easiest way to use the library is simply adding \u003cstrong\u003erpmalloc.[h|c]\u003c/strong\u003e to your project and compile them along with your sources. The allocator is complete self contained, you are not required to call the init/fini functions from your own code, but can do so in order to initialize and finalize the allocator in specific places or provide your own hooks and/or configuration:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003erpmalloc_initialize\u003c/strong\u003e : Call at process start to initialize the allocator\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003erpmalloc_initialize_config\u003c/strong\u003e : Optional entry point to call at process start to initialize the allocator with a custom memory mapping backend, memory page size and mapping granularity.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003erpmalloc_finalize\u003c/strong\u003e: Call at process exit to finalize the allocator\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003erpmalloc_thread_initialize\u003c/strong\u003e: Call at each thread start to initialize the thread local data for the allocator\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003erpmalloc_thread_finalize\u003c/strong\u003e: Call at each thread exit to finalize and release thread cache back to global cache\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003erpmalloc_config\u003c/strong\u003e: Get the current runtime configuration of the allocator\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThen simply use the \u003cstrong\u003erpmalloc\u003c/strong\u003e/\u003cstrong\u003erpfree\u003c/strong\u003e and the other malloc style replacement functions. Remember all allocations are 16-byte aligned, so no need to call the explicit rpmemalign/rpaligned_alloc/rpposix_memalign functions unless you need greater alignment, they are simply wrappers to make it easier to replace in existing code.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you wish to override the standard library malloc family of functions and have automatic initialization/finalization of process and threads, define \u003cstrong\u003eENABLE_OVERRIDE\u003c/strong\u003e to non-zero (default is 1) which will include the \u003ccode\u003emalloc.c\u003c/code\u003e file in compilation of \u003cstrong\u003erpmalloc.c\u003c/strong\u003e, and then rebuild the library or your project where you added the rpmalloc source. If you compile rpmalloc as a separate library you must make the linker use the override symbols from the library by referencing at least one symbol. The easiest way is to simply include \u003ccode\u003erpmalloc.h\u003c/code\u003e in at least one source file and call \u003ccode\u003erpmalloc_linker_reference\u003c/code\u003e somewhere - it's a dummy empty function. For C++ overrides you have to \u003ccode\u003e#include \u0026lt;rpnew.h\u0026gt;\u003c/code\u003e in at least one source file. The list of libc entry points replaced may not be complete, use libc/stdc++ replacement only as a convenience for testing the library on an existing code base, not a final solution.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor explicit first class heaps, see the \u003cem\u003e\u003cem\u003erpmalloc_heap\u003c/em\u003e*\u003c/em\u003e_ API under \u003ca href=\"#first-class-heaps\"\u003efirst class heaps\u003c/a\u003e section, requiring \u003cstrong\u003eRPMALLOC_FIRST_CLASS_HEAPS\u003c/strong\u003e to be defined to 1 - default is 0, as it imposes a very slight performance hit in deallocation path from an extra conditinal instruction.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding\u003c/h1\u003e\u003ca id=\"user-content-building\" class=\"anchor\" aria-label=\"Permalink: Building\" href=\"#building\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo compile as a static library run the configure python script which generates a Ninja build script, then build using ninja. The ninja build produces both a static and a dynamic library named \u003ccode\u003erpmalloc\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBy default the dynamic library can be used with \u003ccode\u003eLD_PRELOAD\u003c/code\u003e/\u003ccode\u003eDYLD_INSERT_LIBRARIES\u003c/code\u003e to inject in a preexisting binary, replacing any malloc/free family of function calls (when \u003cstrong\u003eENABLE_OVERRIDE\u003c/strong\u003e is defined to 1). This is only implemented for Linux and macOS targets. The list of libc entry points replaced may not be complete, use preloading as a convenience for testing the library on an existing binary, not a final solution.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe latest stable release is available in the master branch. For latest development code, use the develop branch.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConfiguration options\u003c/h1\u003e\u003ca id=\"user-content-configuration-options\" class=\"anchor\" aria-label=\"Permalink: Configuration options\" href=\"#configuration-options\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eDetailed statistics are available if \u003cstrong\u003eENABLE_STATISTICS\u003c/strong\u003e is defined to 1 (default is 0, or disabled), either on compile command line or by setting the value in \u003ccode\u003erpmalloc.c\u003c/code\u003e. This will cause a slight overhead in runtime to collect statistics for each memory operation, and will also add 4 bytes overhead per allocation to track sizes.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eInteger safety checks on all calls are enabled if \u003cstrong\u003eENABLE_VALIDATE_ARGS\u003c/strong\u003e is defined to 1 (default is 0, or disabled), either on compile command line or by setting the value in \u003ccode\u003erpmalloc.c\u003c/code\u003e. If enabled, size arguments to the global entry points are verified not to cause integer overflows in calculations.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAsserts are enabled if \u003cstrong\u003eENABLE_ASSERTS\u003c/strong\u003e is defined to 1 (default is 0, or disabled), either on compile command line or by setting the value in \u003ccode\u003erpmalloc.c\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo include \u003cstrong\u003emalloc.c\u003c/strong\u003e in compilation and provide overrides of standard library malloc entry points define \u003cstrong\u003eENABLE_OVERRIDE\u003c/strong\u003e to 1 (this is the default).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo enable support for first class heaps, define \u003cstrong\u003eRPMALLOC_FIRST_CLASS_HEAPS\u003c/strong\u003e to 1 (this is the default).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eHuge pages\u003c/h1\u003e\u003ca id=\"user-content-huge-pages\" class=\"anchor\" aria-label=\"Permalink: Huge pages\" href=\"#huge-pages\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe allocator has support for huge/large pages on Windows, Linux and MacOS. To enable it, pass a non-zero value in the config value \u003ccode\u003eenable_huge_pages\u003c/code\u003e when initializing the allocator with \u003ccode\u003erpmalloc_initialize_config\u003c/code\u003e. If the system does not support huge pages it will be automatically disabled. You can query the status by looking at \u003ccode\u003eenable_huge_pages\u003c/code\u003e in the config returned from a call to \u003ccode\u003erpmalloc_config\u003c/code\u003e after initialization is done.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eQuick overview\u003c/h1\u003e\u003ca id=\"user-content-quick-overview\" class=\"anchor\" aria-label=\"Permalink: Quick overview\" href=\"#quick-overview\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe allocator uses separate heaps for each thread and partitions memory blocks according to a preconfigured set of size classes, up to 8MiB. Huge blocks above this limit are mapped and unmapped directly. Blocks are allocated from a \u003ccode\u003epage\u003c/code\u003e of multiple blocks, all of the same size class. Each \u003ccode\u003epage\u003c/code\u003e is one of three page types, small, medium or large. Each \u003ccode\u003epage\u003c/code\u003e belongs to an even larger \u003ccode\u003espan\u003c/code\u003e of pages, each of the same page type.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eImplementation details\u003c/h1\u003e\u003ca id=\"user-content-implementation-details\" class=\"anchor\" aria-label=\"Permalink: Implementation details\" href=\"#implementation-details\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe allocator is based on a fixed page alignment per page type, and 16 byte block alignment within the page. On Windows this the page alignment is automatically guaranteed up to 64KiB by the VirtualAlloc granularity, and on mmap systems it is achieved by oversizing the mapping and aligning the returned virtual memory address to the required boundaries. By aligning to a fixed size the free operation can locate the header of the memory page without having to do a table lookup by simply masking out the low bits of the address (for 64KiB this would be the low 16 bits).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMemory blocks are divided into the three page types. Small pages have blocks in [0, 4096] bytes, medium blocks (4096, 262144] bytes, and large blocks (262144, 8388608] bytes. The three page types are further divided in block size classes, where small block sizes have a fixed granularity and interval of 16 bytes, and medium and large blocks have a variable interval to limit overhead to a fixed ratio.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eEach span belongs to a single heap that owns all containing blocks to are allocated/free. To avoid locks, each span is completely owned by the allocating thread, and all cross-thread deallocations will be deferred to the owner thread through a separate free list per span.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMemory mapping\u003c/h1\u003e\u003ca id=\"user-content-memory-mapping\" class=\"anchor\" aria-label=\"Permalink: Memory mapping\" href=\"#memory-mapping\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBy default the allocator uses OS APIs to map virtual memory pages as needed, either \u003ccode\u003eVirtualAlloc\u003c/code\u003e on Windows or \u003ccode\u003emmap\u003c/code\u003e on POSIX systems. If you want to use your own custom memory mapping provider you can use \u003cstrong\u003erpmalloc_initialize\u003c/strong\u003e or \u003cstrong\u003erpmalloc_initialize_config\u003c/strong\u003e and pass function pointers to map and unmap virtual memory. These function should reserve and free the requested number of bytes.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe returned memory address from the memory map function MUST be aligned to the system memory page size or the configured page size given during initialization using \u003cstrong\u003erpmalloc_initialize_config\u003c/strong\u003e. Use \u003cstrong\u003erpmalloc_config\u003c/strong\u003e to find the configured system page size for required alignment.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMemory mapping requests are always done in multiples of the memory page size. You can specify a custom page size when initializing rpmalloc with \u003cstrong\u003erpmalloc_initialize_config\u003c/strong\u003e, or pass 0 to let rpmalloc determine the system memory page size using OS APIs. The page size MUST be a power of two.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOn macOS and iOS mmap requests are tagged with tag 240 for easy identification with the vmmap tool.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMemory fragmentation\u003c/h1\u003e\u003ca id=\"user-content-memory-fragmentation\" class=\"anchor\" aria-label=\"Permalink: Memory fragmentation\" href=\"#memory-fragmentation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere is no memory fragmentation by the allocator in the sense that it will not leave unallocated and unusable \"holes\" in the memory pages by calls to allocate and free blocks of different sizes. This is due to the fact that the memory pages allocated for each size class is split up in perfectly aligned blocks which are not reused for a request of a different size. The block freed by a call to \u003ccode\u003erpfree\u003c/code\u003e will always be immediately available for an allocation request within the same size class.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, there is memory fragmentation in the meaning that a request for x bytes followed by a request of y bytes where x and y are at least one size class different in size will return blocks that are at least one memory page apart in virtual address space. Only blocks of the same size will potentially be within the same memory page span.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003erpmalloc keeps an \"active span\" and free list for each size class. This leads to back-to-back allocations will most likely be served from within the same span of memory pages (unless the span runs out of free blocks). The rpmalloc implementation will also use any \"holes\" in memory pages in semi-filled spans before using a completely free span.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFirst class heaps\u003c/h1\u003e\u003ca id=\"user-content-first-class-heaps\" class=\"anchor\" aria-label=\"Permalink: First class heaps\" href=\"#first-class-heaps\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003erpmalloc provides a first class heap type with explicit heap control API. Heaps are maintained with calls to \u003cstrong\u003erpmalloc_heap_acquire\u003c/strong\u003e and \u003cstrong\u003erpmalloc_heap_release\u003c/strong\u003e and allocations/frees are done with \u003cstrong\u003erpmalloc_heap_alloc\u003c/strong\u003e and \u003cstrong\u003erpmalloc_heap_free\u003c/strong\u003e. See the \u003ccode\u003erpmalloc.h\u003c/code\u003e documentation for the full list of functions in the heap API. The main use case of explicit heap control is to scope allocations in a heap and release everything with a single call to \u003cstrong\u003erpmalloc_heap_free_all\u003c/strong\u003e without having to maintain ownership of memory blocks. Note that the heap API is not thread-safe, the caller must make sure that each heap is only used in a single thread at any given time.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProducer-consumer scenario\u003c/h1\u003e\u003ca id=\"user-content-producer-consumer-scenario\" class=\"anchor\" aria-label=\"Permalink: Producer-consumer scenario\" href=\"#producer-consumer-scenario\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCompared to the some other allocators, rpmalloc does not suffer as much from a producer-consumer thread scenario where one thread allocates memory blocks and another thread frees the blocks. In some allocators the free blocks need to traverse both the thread cache of the thread doing the free operations as well as the global cache before being reused in the allocating thread. In rpmalloc the freed blocks will be reused as soon as the allocating thread needs to get new spans from the thread cache. This enables faster release of completely freed memory pages as blocks in a memory page will not be aliased between different owning threads.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBest case scenarios\u003c/h1\u003e\u003ca id=\"user-content-best-case-scenarios\" class=\"anchor\" aria-label=\"Permalink: Best case scenarios\" href=\"#best-case-scenarios\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThreads that keep ownership of allocated memory blocks within the thread and free the blocks from the same thread will have optimal performance.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThreads that have allocation patterns where the difference in memory usage high and low water marks fit within the thread cache thresholds in the allocator will never touch the global cache except during thread init/fini and have optimal performance. Tweaking the cache limits can be done on a per-size-class basis.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWorst case scenarios\u003c/h1\u003e\u003ca id=\"user-content-worst-case-scenarios\" class=\"anchor\" aria-label=\"Permalink: Worst case scenarios\" href=\"#worst-case-scenarios\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSince each thread cache maps spans of memory pages per size class, a thread that allocates just a few blocks of each size class (16, 32, ...) for many size classes will never fill each bucket, and thus map a lot of memory pages while only using a small fraction of the mapped memory. However, the wasted memory will always be less than 4KiB (or the configured memory page size) per size class as each span is initialized one memory page at a time. The cache for free spans will be reused by all size classes.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThreads that perform a lot of allocations and deallocations in a pattern that have a large difference in high and low water marks, and that difference is larger than the thread cache size, will put a lot of contention on the global cache. What will happen is the thread cache will overflow on each low water mark causing pages to be released to the global cache, then underflow on high water mark causing pages to be re-acquired from the global cache. This can be mitigated by changing the \u003cstrong\u003eMAX_SPAN_CACHE_DIVISOR\u003c/strong\u003e define in the source code (at the cost of higher average memory overhead).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCaveats\u003c/h1\u003e\u003ca id=\"user-content-caveats\" class=\"anchor\" aria-label=\"Permalink: Caveats\" href=\"#caveats\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eVirtualAlloc has an internal granularity of 64KiB. However, mmap lacks this granularity control, and the implementation instead oversizes the memory mapping with configured span size to be able to always return a memory area with the required alignment. Since the extra memory pages are never touched this will not result in extra committed physical memory pages, but rather only increase virtual memory address space.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAll entry points assume the passed values are valid, for example passing an invalid pointer to free would most likely result in a segmentation fault. \u003cstrong\u003eThe library does not try to guard against errors!\u003c/strong\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOther languages\u003c/h1\u003e\u003ca id=\"user-content-other-languages\" class=\"anchor\" aria-label=\"Permalink: Other languages\" href=\"#other-languages\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/repi\"\u003eJohan Andersson\u003c/a\u003e at Embark has created a Rust wrapper available at \u003ca href=\"https://github.com/EmbarkStudios/rpmalloc-rs\"\u003erpmalloc-rs\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/nxrighthere\"\u003eStas Denisov\u003c/a\u003e has created a C# wrapper available at \u003ca href=\"https://github.com/nxrighthere/Rpmalloc-CSharp\"\u003eRpmalloc-CSharp\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h1\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is free and unencumbered software released into the public domain.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAnyone is free to copy, modify, publish, use, compile, sell, or\ndistribute this software, either in source code form or as a compiled\nbinary, for any purpose, commercial or non-commercial, and by any\nmeans.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn jurisdictions that recognize copyright laws, the author or authors\nof this software dedicate any and all copyright interest in the\nsoftware to the public domain. We make this dedication for the benefit\nof the public at large and to the detriment of our heirs and\nsuccessors. We intend this dedication to be an overt act of\nrelinquishment in perpetuity of all present and future rights to this\nsoftware under copyright law.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\nMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.\nIN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR\nOTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,\nARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR\nOTHER DEALINGS IN THE SOFTWARE.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor more information, please refer to \u003ca href=\"http://unlicense.org\" rel=\"nofollow\"\u003ehttp://unlicense.org\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYou can also use this software under the MIT license if public domain is\nnot recognized in your country\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe MIT License (MIT)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCopyright (c) 2017 Mattias Jansson\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe above copyright notice and this permission notice shall be included in\nall copies or substantial portions of the Software.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\nTHE SOFTWARE.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"rpmalloc - General Purpose Memory Allocator","anchor":"rpmalloc---general-purpose-memory-allocator","htmlText":"rpmalloc - General Purpose Memory Allocator"},{"level":1,"text":"Performance","anchor":"performance","htmlText":"Performance"},{"level":1,"text":"Required functions","anchor":"required-functions","htmlText":"Required functions"},{"level":1,"text":"Using","anchor":"using","htmlText":"Using"},{"level":1,"text":"Building","anchor":"building","htmlText":"Building"},{"level":1,"text":"Configuration options","anchor":"configuration-options","htmlText":"Configuration options"},{"level":1,"text":"Huge pages","anchor":"huge-pages","htmlText":"Huge pages"},{"level":1,"text":"Quick overview","anchor":"quick-overview","htmlText":"Quick overview"},{"level":1,"text":"Implementation details","anchor":"implementation-details","htmlText":"Implementation details"},{"level":1,"text":"Memory mapping","anchor":"memory-mapping","htmlText":"Memory mapping"},{"level":1,"text":"Memory fragmentation","anchor":"memory-fragmentation","htmlText":"Memory fragmentation"},{"level":1,"text":"First class heaps","anchor":"first-class-heaps","htmlText":"First class heaps"},{"level":1,"text":"Producer-consumer scenario","anchor":"producer-consumer-scenario","htmlText":"Producer-consumer scenario"},{"level":1,"text":"Best case scenarios","anchor":"best-case-scenarios","htmlText":"Best case scenarios"},{"level":1,"text":"Worst case scenarios","anchor":"worst-case-scenarios","htmlText":"Worst case 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class="octicon octicon-list-unordered" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">rpmalloc - General Purpose Memory Allocator</h1><a id="user-content-rpmalloc---general-purpose-memory-allocator" class="anchor" aria-label="Permalink: rpmalloc - General Purpose Memory Allocator" href="#rpmalloc---general-purpose-memory-allocator"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This library provides a public domain cross platform lock free thread caching 16-byte aligned memory allocator implemented in C. The latest source code is always available at <a href="https://github.com/mjansson/rpmalloc">https://github.com/mjansson/rpmalloc</a></p> <p dir="auto">Created by Mattias Jansson (<a href="https://twitter.com/maniccoder" rel="nofollow">@maniccoder</a>) - Discord server for discussions at <a href="https://discord.gg/M8BwTQrt6c" rel="nofollow">https://discord.gg/M8BwTQrt6c</a></p> <p dir="auto">Platforms currently supported:</p> <ul dir="auto"> <li>Windows</li> <li>Linux</li> <li>MacOS</li> <li>iOS</li> <li>Android</li> </ul> <p dir="auto">The code should be easily portable to any platform with atomic operations and an mmap-style virtual memory management API. The API used to map/unmap memory pages can be configured in runtime to a custom implementation and mapping granularity/size.</p> <p dir="auto">This library is put in the public domain; you can redistribute it and/or modify it without any restrictions. Or, if you choose, you can use it under the MIT license.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Performance</h1><a id="user-content-performance" class="anchor" aria-label="Permalink: Performance" href="#performance"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">We believe rpmalloc is faster than most popular memory allocators like tcmalloc, hoard, ptmalloc3 and others without causing extra allocated memory overhead in the thread caches compared to these allocators. We also believe the implementation to be easier to read and modify compared to these allocators, as it is a single source file of ~2200 lines of C code. All allocations have a natural 16-byte alignment.</p> <p dir="auto">Contained in a parallel repository is a benchmark utility that performs interleaved unaligned allocations and deallocations (both in-thread and cross-thread) in multiple threads. It measures number of memory operations performed per CPU second, as well as memory overhead by comparing the virtual memory mapped with the number of bytes requested in allocation calls. The setup of number of thread, cross-thread deallocation rate and allocation size limits is configured by command line arguments.</p> <p dir="auto"><a href="https://github.com/mjansson/rpmalloc-benchmark">https://github.com/mjansson/rpmalloc-benchmark</a></p> <p dir="auto">Below is an example performance comparison chart of rpmalloc and other popular allocator implementations, with default configurations used.</p> <p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://camo.githubusercontent.com/6900574878fd378a4914f91e8414c9c8d8e698ad819edde31aa2a12a38249e3a/68747470733a2f2f646f63732e676f6f676c652e636f6d2f7370726561647368656574732f642f314e574e756172317a3075504342356956535f43733668536f3278506b546d5a66304b736757535f46625f342f70756263686172743f6f69643d33303130313738373726666f726d61743d696d616765"><img src="https://camo.githubusercontent.com/6900574878fd378a4914f91e8414c9c8d8e698ad819edde31aa2a12a38249e3a/68747470733a2f2f646f63732e676f6f676c652e636f6d2f7370726561647368656574732f642f314e574e756172317a3075504342356956535f43733668536f3278506b546d5a66304b736757535f46625f342f70756263686172743f6f69643d33303130313738373726666f726d61743d696d616765" alt="Ubuntu 16.10, random [16, 8000] bytes, 8 cores" data-canonical-src="https://docs.google.com/spreadsheets/d/1NWNuar1z0uPCB5iVS_Cs6hSo2xPkTmZf0KsgWS_Fb_4/pubchart?oid=301017877&format=image" style="max-width: 100%;"></a></p> <p dir="auto">The benchmark producing these numbers were run on an Ubuntu 16.10 machine with 8 logical cores (4 physical, HT). The actual numbers are not to be interpreted as absolute performance figures, but rather as relative comparisons between the different allocators. For additional benchmark results, see the <a href="/mjansson/rpmalloc/blob/develop/BENCHMARKS.md">BENCHMARKS</a> file.</p> <p dir="auto">Configuration of the thread and global caches can be important depending on your use pattern. See <a href="/mjansson/rpmalloc/blob/develop/CACHE.md">CACHE</a> for a case study and some comments/guidelines.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Required functions</h1><a id="user-content-required-functions" class="anchor" aria-label="Permalink: Required functions" href="#required-functions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Before calling any other function in the API, you <strong>MUST</strong> call the initialization function, either <strong>rpmalloc_initialize</strong> or <strong>rpmalloc_initialize_config</strong>, or you will get undefined behaviour when calling other rpmalloc entry point.</p> <p dir="auto">Before terminating your use of the allocator, you <strong>SHOULD</strong> call <strong>rpmalloc_finalize</strong> in order to release caches and unmap virtual memory, as well as prepare the allocator for global scope cleanup at process exit or dynamic library unload depending on your use case.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Using</h1><a id="user-content-using" class="anchor" aria-label="Permalink: Using" href="#using"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The easiest way to use the library is simply adding <strong>rpmalloc.[h|c]</strong> to your project and compile them along with your sources. The allocator is complete self contained, you are not required to call the init/fini functions from your own code, but can do so in order to initialize and finalize the allocator in specific places or provide your own hooks and/or configuration:</p> <p dir="auto"><strong>rpmalloc_initialize</strong> : Call at process start to initialize the allocator</p> <p dir="auto"><strong>rpmalloc_initialize_config</strong> : Optional entry point to call at process start to initialize the allocator with a custom memory mapping backend, memory page size and mapping granularity.</p> <p dir="auto"><strong>rpmalloc_finalize</strong>: Call at process exit to finalize the allocator</p> <p dir="auto"><strong>rpmalloc_thread_initialize</strong>: Call at each thread start to initialize the thread local data for the allocator</p> <p dir="auto"><strong>rpmalloc_thread_finalize</strong>: Call at each thread exit to finalize and release thread cache back to global cache</p> <p dir="auto"><strong>rpmalloc_config</strong>: Get the current runtime configuration of the allocator</p> <p dir="auto">Then simply use the <strong>rpmalloc</strong>/<strong>rpfree</strong> and the other malloc style replacement functions. Remember all allocations are 16-byte aligned, so no need to call the explicit rpmemalign/rpaligned_alloc/rpposix_memalign functions unless you need greater alignment, they are simply wrappers to make it easier to replace in existing code.</p> <p dir="auto">If you wish to override the standard library malloc family of functions and have automatic initialization/finalization of process and threads, define <strong>ENABLE_OVERRIDE</strong> to non-zero (default is 1) which will include the <code>malloc.c</code> file in compilation of <strong>rpmalloc.c</strong>, and then rebuild the library or your project where you added the rpmalloc source. If you compile rpmalloc as a separate library you must make the linker use the override symbols from the library by referencing at least one symbol. The easiest way is to simply include <code>rpmalloc.h</code> in at least one source file and call <code>rpmalloc_linker_reference</code> somewhere - it's a dummy empty function. For C++ overrides you have to <code>#include <rpnew.h></code> in at least one source file. The list of libc entry points replaced may not be complete, use libc/stdc++ replacement only as a convenience for testing the library on an existing code base, not a final solution.</p> <p dir="auto">For explicit first class heaps, see the <em><em>rpmalloc_heap</em>*</em>_ API under <a href="#first-class-heaps">first class heaps</a> section, requiring <strong>RPMALLOC_FIRST_CLASS_HEAPS</strong> to be defined to 1 - default is 0, as it imposes a very slight performance hit in deallocation path from an extra conditinal instruction.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Building</h1><a id="user-content-building" class="anchor" aria-label="Permalink: Building" href="#building"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To compile as a static library run the configure python script which generates a Ninja build script, then build using ninja. The ninja build produces both a static and a dynamic library named <code>rpmalloc</code>.</p> <p dir="auto">By default the dynamic library can be used with <code>LD_PRELOAD</code>/<code>DYLD_INSERT_LIBRARIES</code> to inject in a preexisting binary, replacing any malloc/free family of function calls (when <strong>ENABLE_OVERRIDE</strong> is defined to 1). This is only implemented for Linux and macOS targets. The list of libc entry points replaced may not be complete, use preloading as a convenience for testing the library on an existing binary, not a final solution.</p> <p dir="auto">The latest stable release is available in the master branch. For latest development code, use the develop branch.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Configuration options</h1><a id="user-content-configuration-options" class="anchor" aria-label="Permalink: Configuration options" href="#configuration-options"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Detailed statistics are available if <strong>ENABLE_STATISTICS</strong> is defined to 1 (default is 0, or disabled), either on compile command line or by setting the value in <code>rpmalloc.c</code>. This will cause a slight overhead in runtime to collect statistics for each memory operation, and will also add 4 bytes overhead per allocation to track sizes.</p> <p dir="auto">Integer safety checks on all calls are enabled if <strong>ENABLE_VALIDATE_ARGS</strong> is defined to 1 (default is 0, or disabled), either on compile command line or by setting the value in <code>rpmalloc.c</code>. If enabled, size arguments to the global entry points are verified not to cause integer overflows in calculations.</p> <p dir="auto">Asserts are enabled if <strong>ENABLE_ASSERTS</strong> is defined to 1 (default is 0, or disabled), either on compile command line or by setting the value in <code>rpmalloc.c</code>.</p> <p dir="auto">To include <strong>malloc.c</strong> in compilation and provide overrides of standard library malloc entry points define <strong>ENABLE_OVERRIDE</strong> to 1 (this is the default).</p> <p dir="auto">To enable support for first class heaps, define <strong>RPMALLOC_FIRST_CLASS_HEAPS</strong> to 1 (this is the default).</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Huge pages</h1><a id="user-content-huge-pages" class="anchor" aria-label="Permalink: Huge pages" href="#huge-pages"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The allocator has support for huge/large pages on Windows, Linux and MacOS. To enable it, pass a non-zero value in the config value <code>enable_huge_pages</code> when initializing the allocator with <code>rpmalloc_initialize_config</code>. If the system does not support huge pages it will be automatically disabled. You can query the status by looking at <code>enable_huge_pages</code> in the config returned from a call to <code>rpmalloc_config</code> after initialization is done.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Quick overview</h1><a id="user-content-quick-overview" class="anchor" aria-label="Permalink: Quick overview" href="#quick-overview"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The allocator uses separate heaps for each thread and partitions memory blocks according to a preconfigured set of size classes, up to 8MiB. Huge blocks above this limit are mapped and unmapped directly. Blocks are allocated from a <code>page</code> of multiple blocks, all of the same size class. Each <code>page</code> is one of three page types, small, medium or large. Each <code>page</code> belongs to an even larger <code>span</code> of pages, each of the same page type.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Implementation details</h1><a id="user-content-implementation-details" class="anchor" aria-label="Permalink: Implementation details" href="#implementation-details"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The allocator is based on a fixed page alignment per page type, and 16 byte block alignment within the page. On Windows this the page alignment is automatically guaranteed up to 64KiB by the VirtualAlloc granularity, and on mmap systems it is achieved by oversizing the mapping and aligning the returned virtual memory address to the required boundaries. By aligning to a fixed size the free operation can locate the header of the memory page without having to do a table lookup by simply masking out the low bits of the address (for 64KiB this would be the low 16 bits).</p> <p dir="auto">Memory blocks are divided into the three page types. Small pages have blocks in [0, 4096] bytes, medium blocks (4096, 262144] bytes, and large blocks (262144, 8388608] bytes. The three page types are further divided in block size classes, where small block sizes have a fixed granularity and interval of 16 bytes, and medium and large blocks have a variable interval to limit overhead to a fixed ratio.</p> <p dir="auto">Each span belongs to a single heap that owns all containing blocks to are allocated/free. To avoid locks, each span is completely owned by the allocating thread, and all cross-thread deallocations will be deferred to the owner thread through a separate free list per span.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Memory mapping</h1><a id="user-content-memory-mapping" class="anchor" aria-label="Permalink: Memory mapping" href="#memory-mapping"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">By default the allocator uses OS APIs to map virtual memory pages as needed, either <code>VirtualAlloc</code> on Windows or <code>mmap</code> on POSIX systems. If you want to use your own custom memory mapping provider you can use <strong>rpmalloc_initialize</strong> or <strong>rpmalloc_initialize_config</strong> and pass function pointers to map and unmap virtual memory. These function should reserve and free the requested number of bytes.</p> <p dir="auto">The returned memory address from the memory map function MUST be aligned to the system memory page size or the configured page size given during initialization using <strong>rpmalloc_initialize_config</strong>. Use <strong>rpmalloc_config</strong> to find the configured system page size for required alignment.</p> <p dir="auto">Memory mapping requests are always done in multiples of the memory page size. You can specify a custom page size when initializing rpmalloc with <strong>rpmalloc_initialize_config</strong>, or pass 0 to let rpmalloc determine the system memory page size using OS APIs. The page size MUST be a power of two.</p> <p dir="auto">On macOS and iOS mmap requests are tagged with tag 240 for easy identification with the vmmap tool.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Memory fragmentation</h1><a id="user-content-memory-fragmentation" class="anchor" aria-label="Permalink: Memory fragmentation" href="#memory-fragmentation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">There is no memory fragmentation by the allocator in the sense that it will not leave unallocated and unusable "holes" in the memory pages by calls to allocate and free blocks of different sizes. This is due to the fact that the memory pages allocated for each size class is split up in perfectly aligned blocks which are not reused for a request of a different size. The block freed by a call to <code>rpfree</code> will always be immediately available for an allocation request within the same size class.</p> <p dir="auto">However, there is memory fragmentation in the meaning that a request for x bytes followed by a request of y bytes where x and y are at least one size class different in size will return blocks that are at least one memory page apart in virtual address space. Only blocks of the same size will potentially be within the same memory page span.</p> <p dir="auto">rpmalloc keeps an "active span" and free list for each size class. This leads to back-to-back allocations will most likely be served from within the same span of memory pages (unless the span runs out of free blocks). The rpmalloc implementation will also use any "holes" in memory pages in semi-filled spans before using a completely free span.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">First class heaps</h1><a id="user-content-first-class-heaps" class="anchor" aria-label="Permalink: First class heaps" href="#first-class-heaps"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">rpmalloc provides a first class heap type with explicit heap control API. Heaps are maintained with calls to <strong>rpmalloc_heap_acquire</strong> and <strong>rpmalloc_heap_release</strong> and allocations/frees are done with <strong>rpmalloc_heap_alloc</strong> and <strong>rpmalloc_heap_free</strong>. See the <code>rpmalloc.h</code> documentation for the full list of functions in the heap API. The main use case of explicit heap control is to scope allocations in a heap and release everything with a single call to <strong>rpmalloc_heap_free_all</strong> without having to maintain ownership of memory blocks. Note that the heap API is not thread-safe, the caller must make sure that each heap is only used in a single thread at any given time.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Producer-consumer scenario</h1><a id="user-content-producer-consumer-scenario" class="anchor" aria-label="Permalink: Producer-consumer scenario" href="#producer-consumer-scenario"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Compared to the some other allocators, rpmalloc does not suffer as much from a producer-consumer thread scenario where one thread allocates memory blocks and another thread frees the blocks. In some allocators the free blocks need to traverse both the thread cache of the thread doing the free operations as well as the global cache before being reused in the allocating thread. In rpmalloc the freed blocks will be reused as soon as the allocating thread needs to get new spans from the thread cache. This enables faster release of completely freed memory pages as blocks in a memory page will not be aliased between different owning threads.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Best case scenarios</h1><a id="user-content-best-case-scenarios" class="anchor" aria-label="Permalink: Best case scenarios" href="#best-case-scenarios"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Threads that keep ownership of allocated memory blocks within the thread and free the blocks from the same thread will have optimal performance.</p> <p dir="auto">Threads that have allocation patterns where the difference in memory usage high and low water marks fit within the thread cache thresholds in the allocator will never touch the global cache except during thread init/fini and have optimal performance. Tweaking the cache limits can be done on a per-size-class basis.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Worst case scenarios</h1><a id="user-content-worst-case-scenarios" class="anchor" aria-label="Permalink: Worst case scenarios" href="#worst-case-scenarios"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Since each thread cache maps spans of memory pages per size class, a thread that allocates just a few blocks of each size class (16, 32, ...) for many size classes will never fill each bucket, and thus map a lot of memory pages while only using a small fraction of the mapped memory. However, the wasted memory will always be less than 4KiB (or the configured memory page size) per size class as each span is initialized one memory page at a time. The cache for free spans will be reused by all size classes.</p> <p dir="auto">Threads that perform a lot of allocations and deallocations in a pattern that have a large difference in high and low water marks, and that difference is larger than the thread cache size, will put a lot of contention on the global cache. What will happen is the thread cache will overflow on each low water mark causing pages to be released to the global cache, then underflow on high water mark causing pages to be re-acquired from the global cache. This can be mitigated by changing the <strong>MAX_SPAN_CACHE_DIVISOR</strong> define in the source code (at the cost of higher average memory overhead).</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Caveats</h1><a id="user-content-caveats" class="anchor" aria-label="Permalink: Caveats" href="#caveats"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">VirtualAlloc has an internal granularity of 64KiB. However, mmap lacks this granularity control, and the implementation instead oversizes the memory mapping with configured span size to be able to always return a memory area with the required alignment. Since the extra memory pages are never touched this will not result in extra committed physical memory pages, but rather only increase virtual memory address space.</p> <p dir="auto">All entry points assume the passed values are valid, for example passing an invalid pointer to free would most likely result in a segmentation fault. <strong>The library does not try to guard against errors!</strong>.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Other languages</h1><a id="user-content-other-languages" class="anchor" aria-label="Permalink: Other languages" href="#other-languages"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://github.com/repi">Johan Andersson</a> at Embark has created a Rust wrapper available at <a href="https://github.com/EmbarkStudios/rpmalloc-rs">rpmalloc-rs</a></p> <p dir="auto"><a href="https://github.com/nxrighthere">Stas Denisov</a> has created a C# wrapper available at <a href="https://github.com/nxrighthere/Rpmalloc-CSharp">Rpmalloc-CSharp</a></p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">License</h1><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is free and unencumbered software released into the public domain.</p> <p dir="auto">Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.</p> <p dir="auto">In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.</p> <p dir="auto">THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</p> <p dir="auto">For more information, please refer to <a href="http://unlicense.org" rel="nofollow">http://unlicense.org</a></p> <p dir="auto">You can also use this software under the MIT license if public domain is not recognized in your country</p> <p dir="auto">The MIT License (MIT)</p> <p dir="auto">Copyright (c) 2017 Mattias Jansson</p> <p dir="auto">Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:</p> <p dir="auto">The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.</p> <p dir="auto">THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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