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メモリ一貫性 - Wikipedia
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id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="サイト"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="目次" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">目次</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">非表示</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">ページ先頭</div> </a> </li> <li id="toc-関連項目" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#関連項目"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>関連項目</span> </div> </a> <ul id="toc-関連項目-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="目次" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="目次の表示・非表示を切り替え" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">目次の表示・非表示を切り替え</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">メモリ一貫性</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="特定の記事の別の言語版に移動します。 利用可能な言語5件" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-5" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">5の言語版</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Memory_coherence" title="英語: Memory coherence" lang="en" hreflang="en" data-title="Memory coherence" data-language-autonym="English" data-language-local-name="英語" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B3%D0%B5%D1%80%D0%B5%D0%BD%D1%82%D0%BD%D0%BE%D1%81%D1%82%D1%8C_%D0%BF%D0%B0%D0%BC%D1%8F%D1%82%D0%B8" title="ロシア語: Когерентность памяти" lang="ru" hreflang="ru" data-title="Когерентность памяти" data-language-autonym="Русский" data-language-local-name="ロシア語" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9A%D0%BE%D1%85%D0%B5%D1%80%D0%B5%D0%BD%D1%82%D0%BD%D0%BE%D1%81%D1%82_%D0%BC%D0%B5%D0%BC%D0%BE%D1%80%D0%B8%D1%98%D0%B5" title="セルビア語: Кохерентност меморије" lang="sr" hreflang="sr" data-title="Кохерентност меморије" data-language-autonym="Српски / srpski" data-language-local-name="セルビア語" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Bellek_tutarl%C4%B1l%C4%B1%C4%9F%C4%B1" title="トルコ語: Bellek tutarlılığı" lang="tr" hreflang="tr" data-title="Bellek tutarlılığı" data-language-autonym="Türkçe" data-language-local-name="トルコ語" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9A%D0%BE%D0%B3%D0%B5%D1%80%D0%B5%D0%BD%D1%86%D1%96%D1%8F_%D0%BF%D0%B0%D0%BC%27%D1%8F%D1%82%D1%96" title="ウクライナ語: Когеренція пам'яті" lang="uk" hreflang="uk" data-title="Когеренція пам'яті" data-language-autonym="Українська" data-language-local-name="ウクライナ語" class="interlanguage-link-target"><span>Українська</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q4226071#sitelinks-wikipedia" title="言語間リンクを編集" class="wbc-editpage">リンクを編集</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="名前空間"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7" title="本文を閲覧 [c]" accesskey="c"><span>ページ</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E3%83%8E%E3%83%BC%E3%83%88:%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=edit&redlink=1" rel="discussion" class="new" title="「本文ページについての議論」 (存在しないページ) [t]" accesskey="t"><span>ノート</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="別の言語に切り替える" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">日本語</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="表示"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7"><span>閲覧</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=edit" title="このページのソースコードを編集する [e]" accesskey="e"><span>編集</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=history" title="このページの過去の版 [h]" accesskey="h"><span>履歴表示</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="ページツール"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="ツール" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">ツール</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">ツール</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">非表示</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="その他の操作" > <div class="vector-menu-heading"> 操作 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7"><span>閲覧</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=edit" title="このページのソースコードを編集する [e]" accesskey="e"><span>編集</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=history"><span>履歴表示</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> 全般 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E3%83%AA%E3%83%B3%E3%82%AF%E5%85%83/%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7" title="ここにリンクしている全ウィキページの一覧 [j]" accesskey="j"><span>リンク元</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E9%96%A2%E9%80%A3%E3%83%9A%E3%83%BC%E3%82%B8%E3%81%AE%E6%9B%B4%E6%96%B0%E7%8A%B6%E6%B3%81/%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7" rel="nofollow" title="このページからリンクしているページの最近の更新 [k]" accesskey="k"><span>関連ページの更新状況</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Wikipedia:%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E3%81%AE%E3%82%A2%E3%83%83%E3%83%97%E3%83%AD%E3%83%BC%E3%83%89" title="ファイルをアップロードする [u]" accesskey="u"><span>ファイルをアップロード</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E7%89%B9%E5%88%A5%E3%83%9A%E3%83%BC%E3%82%B8%E4%B8%80%E8%A6%A7" title="特別ページの一覧 [q]" accesskey="q"><span>特別ページ</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&oldid=96267480" title="このページのこの版への固定リンク"><span>この版への固定リンク</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=info" title="このページについての詳細情報"><span>ページ情報</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%81%93%E3%81%AE%E3%83%9A%E3%83%BC%E3%82%B8%E3%82%92%E5%BC%95%E7%94%A8&page=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&id=96267480&wpFormIdentifier=titleform" title="このページの引用方法"><span>このページを引用</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:UrlShortener&url=https%3A%2F%2Fja.wikipedia.org%2Fwiki%2F%25E3%2583%25A1%25E3%2583%25A2%25E3%2583%25AA%25E4%25B8%2580%25E8%25B2%25AB%25E6%2580%25A7"><span>短縮URLを取得する</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:QrCode&url=https%3A%2F%2Fja.wikipedia.org%2Fwiki%2F%25E3%2583%25A1%25E3%2583%25A2%25E3%2583%25AA%25E4%25B8%2580%25E8%25B2%25AB%25E6%2580%25A7"><span>QRコードをダウンロード</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> 印刷/書き出し </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%83%96%E3%83%83%E3%82%AF&bookcmd=book_creator&referer=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7"><span>ブックの新規作成</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:DownloadAsPdf&page=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=show-download-screen"><span>PDF 形式でダウンロード</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&printable=yes" title="このページの印刷用ページ [p]" accesskey="p"><span>印刷用バージョン</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> 他のプロジェクト </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q4226071" title="関連付けられたデータリポジトリ項目へのリンク [g]" accesskey="g"><span>ウィキデータ項目</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="ページツール"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="表示"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">表示</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">非表示</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">出典: フリー百科事典『ウィキペディア(Wikipedia)』</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ja" dir="ltr"><style 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decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/75px-Question_book-4.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/100px-Question_book-4.svg.png 2x" data-file-width="262" data-file-height="204" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span"><b>この記事は<a href="/wiki/Wikipedia:%E6%A4%9C%E8%A8%BC%E5%8F%AF%E8%83%BD%E6%80%A7" title="Wikipedia:検証可能性">検証可能</a>な<a href="/wiki/Wikipedia:%E4%BF%A1%E9%A0%BC%E3%81%A7%E3%81%8D%E3%82%8B%E6%83%85%E5%A0%B1%E6%BA%90" title="Wikipedia:信頼できる情報源">参考文献や出典</a>が全く示されていないか、不十分です。</b><span class="hide-when-compact"> <a href="/wiki/Wikipedia:%E5%87%BA%E5%85%B8%E3%82%92%E6%98%8E%E8%A8%98%E3%81%99%E3%82%8B" title="Wikipedia:出典を明記する">出典を追加</a>して記事の信頼性向上にご協力ください。<small>(<a href="/wiki/Template:%E5%87%BA%E5%85%B8%E3%81%AE%E6%98%8E%E8%A8%98/doc" title="Template:出典の明記/doc">このテンプレートの使い方</a>)</small><br /><small><span class="plainlinks">出典検索<a href="/wiki/Template:Find_sources_mainspace" title="Template:Find sources mainspace"><sup>?</sup></a>: <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&as_eq=wikipedia&q=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22&num=50">"メモリ一貫性"</a> – <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&q=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22&tbm=nws">ニュース</a> <b>·</b> <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&tbs=bks:1&q=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22">書籍</a> <b>·</b> <a rel="nofollow" class="external text" href="//scholar.google.co.jp/scholar?num=100&hl=ja&q=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22">スカラー</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ci.nii.ac.jp/opensearch/search?lang=ja&q=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22&range=2&count=200&sortorder=1&type=0">CiNii</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstage.jst.go.jp/result/global/-char/ja?globalSearchKey=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22">J-STAGE</a> <b>·</b> <a rel="nofollow" class="external text" href="https://ndlsearch.ndl.go.jp/api/openurl?any=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22">NDL</a> <b>·</b> <a rel="nofollow" class="external text" href="https://dlib.jp/?q=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22">dlib.jp</a> <b>·</b> <a rel="nofollow" class="external text" href="https://jpsearch.go.jp/csearch/jps-cross?csid=jps-cross&keyword=%22%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7%22">ジャパンサーチ</a> <b>·</b> <a rel="nofollow" class="external text" href="https://wikipedialibrary.wmflabs.org/partners/">TWL</a></span></small></span> <span class="date-container"><i>(<span class="date"><span title="2023年1月4日 (水) 12:00 (UTC)">2023年1月</span></span>)</i></span></div></td></tr></tbody></table> <p><b>メモリ一貫性</b>(メモリいっかんせい、<a href="/wiki/%E8%8B%B1%E8%AA%9E" title="英語">英</a>: <span lang="en">Memory coherence</span>)とは、2つ以上の<a href="/wiki/CPU" title="CPU">プロセッサ</a>をそなえ<a href="/wiki/%E8%A8%98%E6%86%B6%E8%A3%85%E7%BD%AE" title="記憶装置">記憶装置</a>を共有するコンピュータにおいて、各プロセッサが読み書きするメモリのデータが不整合をきたさないという特質である。メモリ一貫性は、そうした<a href="/wiki/%E3%82%B3%E3%83%B3%E3%83%94%E3%83%A5%E3%83%BC%E3%82%BF" title="コンピュータ">コンピュータシステム</a>の設計に影響を与える問題である。 </p><p>コンピュータシステムは永続記憶域からメモリにデータを読み出し、データに何らかの操作を施し(例えば二つの数値を加算するなど)、その結果を永続記憶域に書き戻すことにより動作する。プロセッサが一つのシステム(廉価な<a href="/wiki/%E3%83%91%E3%83%BC%E3%82%BD%E3%83%8A%E3%83%AB%E3%82%B3%E3%83%B3%E3%83%94%E3%83%A5%E3%83%BC%E3%82%BF" title="パーソナルコンピュータ">パーソナルコンピュータ</a>など) ではデータの読み書きを行うプロセッサも一つしかない。 またプロセッサが一つであれば同時に一つのことしか行うことができないので、記憶域内の情報が変化させたとしても、その後の操作では確実に変化した情報を取り出すことができる。 </p><p><a href="/wiki/%E3%83%9E%E3%83%AB%E3%83%81%E3%83%97%E3%83%AD%E3%82%BB%E3%83%83%E3%82%B7%E3%83%B3%E3%82%B0" title="マルチプロセッシング">マルチプロセッサ</a>のシステムでは、同時に動くプロセッサが複数存在し、 すべてのプロセッサが同時に同じ情報を処理する可能性が生じる。どのプロセッサも情報を書き換えることがなければプロセッサ間で情報を共有することに何の支障もないが、いずれかのプロセッサが情報を書き換えると、他のプロセッサは書き換えられる前の古いコピーを使って作業を行ってしまう。そこで何らかの方法を用いてすべてのプロセッサに情報が変化したことを通知しなければならない。それらの方法いくつかが"メモリ一貫性プロトコル" として知られる。メモリ一貫性だけでは並行動作するプログラムが安全にデータを書き込むことができず、キャッシュ<a href="/wiki/%E4%B8%A6%E5%88%97%E3%82%B3%E3%83%B3%E3%83%94%E3%83%A5%E3%83%BC%E3%83%86%E3%82%A3%E3%83%B3%E3%82%B0#一貫性モデル" class="mw-redirect" title="並列コンピューティング">一貫性モデル</a>と組み合わせて使用する。 </p><p>メモリ一貫性を維持するためにさまざまなプロトコルが考案されている。例えば<a href="https://en.wikipedia.org/wiki/MSI_protocol" class="extiw" title="en:MSI protocol">MSI プロトコル</a>や、その派生系である <a href="/wiki/MESI%E3%83%97%E3%83%AD%E3%83%88%E3%82%B3%E3%83%AB" title="MESIプロトコル">MESIプロトコル</a>、<a href="https://en.wikipedia.org/wiki/MOSI_protocol" class="extiw" title="en:MOSI protocol">MOSIプロトコル</a>、<a href="https://en.wikipedia.org/wiki/MOESI_protocol" class="extiw" title="en:MOESI protocol">MOESIプロトコル</a>などがある。 </p> <div class="mw-heading mw-heading2"><h2 id="関連項目"><span id=".E9.96.A2.E9.80.A3.E9.A0.85.E7.9B.AE"></span>関連項目</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E3%83%A1%E3%83%A2%E3%83%AA%E4%B8%80%E8%B2%AB%E6%80%A7&action=edit&section=1" title="節を編集: 関連項目"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/%E3%83%90%E3%82%B9%E3%82%B9%E3%83%8C%E3%83%BC%E3%83%94%E3%83%B3%E3%82%B0" title="バススヌーピング">バススヌーピング</a></li> <li><a href="/wiki/%E3%82%AD%E3%83%A3%E3%83%83%E3%82%B7%E3%83%A5%E3%82%B3%E3%83%92%E3%83%BC%E3%83%AC%E3%83%B3%E3%82%B7" title="キャッシュコヒーレンシ">キャッシュコヒーレンシ</a></li> <li><a href="/wiki/%E3%82%AD%E3%83%A3%E3%83%83%E3%82%B7%E3%83%A5%E3%82%B3%E3%83%92%E3%83%BC%E3%83%AC%E3%83%B3%E3%82%B7#一貫性モデル" title="キャッシュコヒーレンシ">一貫性モデル</a></li> <li><a href="/wiki/%E3%82%AD%E3%83%A3%E3%83%83%E3%82%B7%E3%83%A5%E3%82%B3%E3%83%92%E3%83%BC%E3%83%AC%E3%83%B3%E3%82%B7#キャッシュコヒーレンシ機構" title="キャッシュコヒーレンシ">ディレクトリベースの一貫性機構</a></li> <li><a href="/wiki/%E5%88%86%E6%95%A3%E5%85%B1%E6%9C%89%E3%83%A1%E3%83%A2%E3%83%AA" title="分散共有メモリ">分散共有メモリ</a></li> <li><a href="/wiki/%E7%AB%B6%E5%90%88%E7%8A%B6%E6%85%8B" title="競合状態">競合状態</a></li></ul> <!-- NewPP limit report Parsed by mw‐web.codfw.main‐565f7d7996‐cbqh8 Cached time: 20241030231651 Cache expiry: 2592000 Reduced expiry: false Complications: [] CPU time usage: 0.081 seconds Real time usage: 0.117 seconds Preprocessor visited node count: 369/1000000 Post‐expand include size: 10707/2097152 bytes Template argument size: 1210/2097152 bytes Highest expansion depth: 22/100 Expensive parser function count: 1/500 Unstrip recursion depth: 0/20 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