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Multiprocés simètric - Viquipèdia, l'enciclopèdia lliure

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[n]" accesskey="n"><span>Discussió per aquest IP</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"><!-- CentralNotice --></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Lloc"> <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="Contingut" 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">Contingut</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">amaga</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">Inici</div> </a> </li> <li id="toc-Explicació_detallada" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Explicació_detallada"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Explicació detallada</span> </div> </a> <ul id="toc-Explicació_detallada-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Conceptes_relacionats" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Conceptes_relacionats"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Conceptes relacionats</span> </div> </a> <ul id="toc-Conceptes_relacionats-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Vegeu_també" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Vegeu_també"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Vegeu també</span> </div> </a> <ul id="toc-Vegeu_també-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Referències" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Referències"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Referències</span> </div> </a> <ul id="toc-Referències-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Enllaços_externs" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Enllaços_externs"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Enllaços externs</span> </div> </a> <ul id="toc-Enllaços_externs-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="Contingut" 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="Commuta la taula de continguts." > <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">Commuta la taula de continguts.</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">Multiprocés simètric</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="Vés a un article en una altra llengua. Disponible en 21 llengües" > <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-21" 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">21 llengües</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AD%D9%88%D8%B3%D8%A8%D8%A9_%D9%85%D8%AA%D8%B9%D8%AF%D8%AF%D8%A9_%D9%85%D8%AA%D9%85%D8%A7%D8%AB%D9%84%D8%A9" title="حوسبة متعددة متماثلة - àrab" lang="ar" hreflang="ar" data-title="حوسبة متعددة متماثلة" data-language-autonym="العربية" data-language-local-name="àrab" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Symetrick%C3%BD_multiprocesing" title="Symetrický multiprocesing - txec" lang="cs" hreflang="cs" data-title="Symetrický multiprocesing" data-language-autonym="Čeština" data-language-local-name="txec" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Symmetrisches_Multiprozessorsystem" title="Symmetrisches Multiprozessorsystem - alemany" lang="de" hreflang="de" data-title="Symmetrisches Multiprozessorsystem" data-language-autonym="Deutsch" data-language-local-name="alemany" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A3%CF%85%CE%BC%CE%BC%CE%B5%CF%84%CF%81%CE%B9%CE%BA%CE%AE_%CF%80%CE%BF%CE%BB%CF%85%CE%B5%CF%80%CE%B5%CE%BE%CE%B5%CF%81%CE%B3%CE%B1%CF%83%CE%AF%CE%B1" title="Συμμετρική πολυεπεξεργασία - grec" lang="el" hreflang="el" data-title="Συμμετρική πολυεπεξεργασία" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Symmetric_multiprocessing" title="Symmetric multiprocessing - anglès" lang="en" hreflang="en" data-title="Symmetric multiprocessing" data-language-autonym="English" data-language-local-name="anglès" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Multiprocesamiento_sim%C3%A9trico" title="Multiprocesamiento simétrico - espanyol" lang="es" hreflang="es" data-title="Multiprocesamiento simétrico" data-language-autonym="Español" data-language-local-name="espanyol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%86%D9%86%D8%AF%D9%BE%D8%B1%D8%AF%D8%A7%D8%B2%D8%B4%DB%8C_%D9%85%D8%AA%D9%82%D8%A7%D8%B1%D9%86" title="چندپردازشی متقارن - persa" lang="fa" hreflang="fa" data-title="چندپردازشی متقارن" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Symmetric_multiprocessing" title="Symmetric multiprocessing - francès" lang="fr" hreflang="fr" data-title="Symmetric multiprocessing" data-language-autonym="Français" data-language-local-name="francès" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Sistema_multiprocessore_simmetrico" title="Sistema multiprocessore simmetrico - italià" lang="it" hreflang="it" data-title="Sistema multiprocessore simmetrico" data-language-autonym="Italiano" data-language-local-name="italià" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%AF%BE%E7%A7%B0%E5%9E%8B%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="対称型マルチプロセッシング - japonès" lang="ja" hreflang="ja" data-title="対称型マルチプロセッシング" data-language-autonym="日本語" data-language-local-name="japonès" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%8C%80%EC%B9%AD%ED%98%95_%EB%8B%A4%EC%A4%91_%EC%B2%98%EB%A6%AC" title="대칭형 다중 처리 - coreà" lang="ko" hreflang="ko" data-title="대칭형 다중 처리" data-language-autonym="한국어" data-language-local-name="coreà" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A1%D0%B8%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%BD%D0%B0_%D0%BF%D0%BE%D0%B2%D0%B5%D1%9C%D0%B5%D0%BA%D1%80%D0%B0%D1%82%D0%BD%D0%B0_%D0%BE%D0%B1%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%BA%D0%B0" title="Симетрична повеќекратна обработка - macedoni" lang="mk" hreflang="mk" data-title="Симетрична повеќекратна обработка" data-language-autonym="Македонски" data-language-local-name="macedoni" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Symmetric_multiprocessing" title="Symmetric multiprocessing - neerlandès" lang="nl" hreflang="nl" data-title="Symmetric multiprocessing" data-language-autonym="Nederlands" data-language-local-name="neerlandès" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Symmetrisk_flerprosessering" title="Symmetrisk flerprosessering - noruec bokmål" lang="nb" hreflang="nb" data-title="Symmetrisk flerprosessering" data-language-autonym="Norsk bokmål" data-language-local-name="noruec bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Wieloprocesorowo%C5%9B%C4%87_symetryczna" title="Wieloprocesorowość symetryczna - polonès" lang="pl" hreflang="pl" data-title="Wieloprocesorowość symetryczna" data-language-autonym="Polski" data-language-local-name="polonès" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Multiprocessamento_sim%C3%A9trico" title="Multiprocessamento simétrico - portuguès" lang="pt" hreflang="pt" data-title="Multiprocessamento simétrico" data-language-autonym="Português" data-language-local-name="portuguès" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D0%B8%D0%BC%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%BD%D0%B0%D1%8F_%D0%BC%D0%BD%D0%BE%D0%B3%D0%BE%D0%BF%D1%80%D0%BE%D1%86%D0%B5%D1%81%D1%81%D0%BE%D1%80%D0%BD%D0%BE%D1%81%D1%82%D1%8C" title="Симметричная многопроцессорность - rus" lang="ru" hreflang="ru" data-title="Симметричная многопроцессорность" data-language-autonym="Русский" data-language-local-name="rus" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Symetrick%C3%BD_multiprocesing" title="Symetrický multiprocesing - eslovac" lang="sk" hreflang="sk" data-title="Symetrický multiprocesing" data-language-autonym="Slovenčina" data-language-local-name="eslovac" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Symmetric_Multiprocessing" title="Symmetric Multiprocessing - suec" lang="sv" hreflang="sv" data-title="Symmetric Multiprocessing" data-language-autonym="Svenska" data-language-local-name="suec" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%B8%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%BD%D0%B0_%D0%BC%D1%83%D0%BB%D1%8C%D1%82%D0%B8%D0%BF%D1%80%D0%BE%D1%86%D0%B5%D1%81%D0%BE%D1%80%D0%BD%D1%96%D1%81%D1%82%D1%8C" title="Симетрична мультипроцесорність - ucraïnès" lang="uk" hreflang="uk" data-title="Симетрична мультипроцесорність" data-language-autonym="Українська" data-language-local-name="ucraïnès" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%AF%B9%E7%A7%B0%E5%A4%9A%E5%A4%84%E7%90%86" title="对称多处理 - xinès" lang="zh" hreflang="zh" data-title="对称多处理" data-language-autonym="中文" data-language-local-name="xinès" class="interlanguage-link-target"><span>中文</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/Q178677#sitelinks-wikipedia" title="Modifica enllaços interlingües" class="wbc-editpage">Modifica els enllaços</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="Espais de noms"> <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/Multiproc%C3%A9s_sim%C3%A8tric" title="Vegeu el contingut de la pàgina [c]" accesskey="c"><span>Pàgina</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Discussi%C3%B3:Multiproc%C3%A9s_sim%C3%A8tric&amp;action=edit&amp;redlink=1" rel="discussion" class="new" title="Discussió sobre el contingut d&#039;aquesta pàgina (encara no existeix) [t]" accesskey="t"><span>Discussió</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="Canvia la variant de llengua" > <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">català</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="Vistes"> <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/Multiproc%C3%A9s_sim%C3%A8tric"><span>Mostra</span></a></li><li id="ca-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Multiproc%C3%A9s_sim%C3%A8tric&amp;action=edit" title="Modifica el codi font d&#039;aquesta pàgina [e]" 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data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aparença</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">mou a la barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">amaga</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">De la Viquipèdia, l&#039;enciclopèdia lliure</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(S'ha redirigit des de: <a href="/w/index.php?title=SMP&amp;redirect=no" class="mw-redirect" title="SMP">SMP</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ca" dir="ltr"><p><b> SMP </b> és la sigla de <i> Symmetric Multi-Processing </i>, multiprocés simètric. Es tracta d'un tipus d'<a href="/wiki/Arquitectura_d%27ordinadors" class="mw-redirect" title="Arquitectura d&#39;ordinadors">arquitectura d'ordinadors</a> en què dos o més <a href="/wiki/Processador" class="mw-redirect" title="Processador">processadors</a> comparteixen una única memòria central. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Explicació_detallada"><span id="Explicaci.C3.B3_detallada"></span>Explicació detallada</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Multiproc%C3%A9s_sim%C3%A8tric&amp;action=edit&amp;section=1" title="Modifica la secció: Explicació detallada"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>L'arquitectura SMP (Multi-simètric, també anomenada UMA, de <i>Uniform Memory Access</i>), es caracteritza pel fet que diversos microprocessadors comparteixen l'accés a la memòria. Tots els microprocessadors competeixen en igualtat de condicions per aquest accés, d'aquí la denominació "simètric". </p><p>Els sistemes SMP permeten que qualsevol processador treballi en qualsevol tasca sense importar la seva localització en memòria, amb un propici suport del <a href="/wiki/Sistema_operatiu" title="Sistema operatiu">sistema operatiu</a>, aquests sistemes poden moure fàcilment tasques entre els processadors per garantir eficientment el treball. </p><p>Un <a href="/wiki/Ordinador" title="Ordinador">ordinador</a> SMP es compon de microprocessadors independents que es comuniquen amb la memòria a través d'un <a href="/wiki/Bus_(inform%C3%A0tica)" title="Bus (informàtica)">bus</a> compartit. Aquest <i> bus </i> és un recurs d'ús comú. Per tant, ha de ser arbitrat perquè només un microprocessador el sempre a cada instant de temps. Si els ordinadors amb un sol microprocessador tendeixen a gastar considerable temps esperant que arribin les dades des de la memòria, SMP empitjora aquesta situació, ja que hi ha diversos aturats en espera de dades. </p> <div class="mw-heading mw-heading2"><h2 id="Conceptes_relacionats">Conceptes relacionats</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Multiproc%C3%A9s_sim%C3%A8tric&amp;action=edit&amp;section=2" title="Modifica la secció: Conceptes relacionats"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Arquitectura_NUMA" title="Arquitectura NUMA">Arquitectura NUMA</a></li></ul> <p>Multiprocés simètric, una de les formes més fàcils i barates d'augmentar el rendiment del maquinari és posar més d'una CPU a la placa. Això es pot realitzar fent que CPU diferents tinguin treballs diferents (multiprocés asimètric) o fent que tots s'executin en paral·lel, realitzant la mateixa feina (multiprocés simètric o SMP). El fer multiprocés asimètric requereix un coneixement especialitzat sobre les tasques que l'ordinador ha d'executar, que no és fàcilment discernible en un sistema operatiu de propòsit general com Linux. En canvi el multiprocés simètric és relativament fàcil d'implementar. </p><p>En un entorn de multiprocés simètric, les CPU comparteixen la mateixa memòria, i com a resultat, el codi que corre en una CPU pot afectar la memòria utilitzada per una altra. No es pot estar segur que una variable que s'ha establert a un cert valor a la línia anterior encara tingui el mateix valor, l'altra CPU pot modificar el valor de la variable. No és possible programar una mica d'aquesta manera. </p><p>En el cas de la programació de processos això no sol ser un problema, perquè un procés normalment només s'executarà en una CPU a la vegada. El nucli, però, podria ser cridat per diferents processos executant-se en CPU diferents. </p><p>En la versió 2.0.x del nucli de Linux, això no és un problema perquè el nucli sencer està en un gran spinlock '. Això significa que si una CPU està dins del nucli i una altra CPU vol entrar-hi, per exemple per una trucada al sistema, ha d'esperar fins que la primera CPU hagi acabat. Això és el que fa el SMP a Linux, és segur, però ineficient. </p><p>En la versió 2.2.x, diverses CPU poden estar dins del nucli al mateix temps. Això és una cosa que els escriptors de mòduls han de tenir en compte. </p> <div class="mw-heading mw-heading2"><h2 id="Vegeu_també"><span id="Vegeu_tamb.C3.A9"></span>Vegeu també</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Multiproc%C3%A9s_sim%C3%A8tric&amp;action=edit&amp;section=3" title="Modifica la secció: Vegeu també"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Arquitectura_Harvard" title="Arquitectura Harvard">Arquitectura Harvard</a></li> <li><a href="/wiki/Arquitectura_Eckert-Mauchly" class="mw-redirect" title="Arquitectura Eckert-Mauchly">Arquitectura Eckert-Mauchly</a></li> <li><a href="/wiki/Sistemes_redundants" class="mw-redirect" title="Sistemes redundants">Sistemes redundants</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Referències"><span id="Refer.C3.A8ncies"></span>Referències</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Multiproc%C3%A9s_sim%C3%A8tric&amp;action=edit&amp;section=4" title="Modifica la secció: Referències"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>The Intel Microprocessors 8086/8088, 80186/80188, 80286, 80386, 80486, Pentium, and Pentium Pro Processor Architecture, Programming, and Inter- facing (ISBN: 9780139954085), Prentice Hall (2000), Autor:Brey. Barry B.</li> <li><a rel="nofollow" class="external text" href="http://multicore.ning.com/">Multiprocessing online community</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120107061839/http://multicore.ning.com/">Arxivat</a> 2012-01-07 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</li> <li><a rel="nofollow" class="external text" href="http://www.computerworld.com/s/article/54343/Chip_Multiprocessing?taxonomyId=064">Chip_Multiprocessing</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110605092034/http://www.computerworld.com/s/article/54343/Chip_Multiprocessing?taxonomyId=064">Arxivat</a> 2011-06-05 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Enllaços_externs"><span id="Enlla.C3.A7os_externs"></span>Enllaços externs</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Multiproc%C3%A9s_sim%C3%A8tric&amp;action=edit&amp;section=5" title="Modifica la secció: Enllaços externs"><span>modifica</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://multicore.ning.com/">multiprocessing online community</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120107061839/http://multicore.ning.com/">Arxivat</a> 2012-01-07 a <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</li></ul> <!-- NewPP limit report Parsed by mw‐web.eqiad.main‐598c47c764‐qgjk8 Cached time: 20241119012931 Cache expiry: 2592000 Reduced expiry: false Complications: [show‐toc] CPU time usage: 0.024 seconds Real time usage: 0.034 seconds Preprocessor visited node count: 53/1000000 Post‐expand include size: 1206/2097152 bytes Template argument size: 0/2097152 bytes Highest expansion depth: 3/100 Expensive parser function count: 0/500 Unstrip recursion depth: 0/20 Unstrip post‐expand size: 0/5000000 bytes Lua time usage: 0.004/10.000 seconds Lua memory usage: 632362/52428800 bytes Number of Wikibase entities loaded: 0/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 19.890 1 -total 99.20% 19.731 3 Plantilla:Webarchive --> <!-- Saved in parser cache with key cawiki:pcache:idhash:594313-0!canonical and timestamp 20241119012931 and revision id 33699141. 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