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UltraSPARC T1 - Wikipedia

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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="Mostra/Nascondi l&#039;indice" > <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">Mostra/Nascondi l&#039;indice</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">UltraSPARC T1</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="Vai a una voce in un&#039;altra lingua. Disponibile in 10 lingue" > <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-10" 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">10 lingue</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/UltraSPARC_T1" title="UltraSPARC T1 - inglese" lang="en" hreflang="en" data-title="UltraSPARC T1" data-language-autonym="English" data-language-local-name="inglese" 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/UltraSPARC_T1" title="UltraSPARC T1 - spagnolo" lang="es" hreflang="es" data-title="UltraSPARC T1" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/UltraSPARC_T1" title="UltraSPARC T1 - francese" lang="fr" hreflang="fr" data-title="UltraSPARC T1" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/UltraSPARC_T1" title="UltraSPARC T1 - ungherese" lang="hu" hreflang="hu" data-title="UltraSPARC T1" data-language-autonym="Magyar" data-language-local-name="ungherese" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/UltraSPARC_T1" title="UltraSPARC T1 - giapponese" lang="ja" hreflang="ja" data-title="UltraSPARC T1" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/UltraSPARC_T1" title="UltraSPARC T1 - norvegese bokmål" lang="nb" hreflang="nb" data-title="UltraSPARC T1" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese 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/UltraSPARC_T1" title="UltraSPARC T1 - polacco" lang="pl" hreflang="pl" data-title="UltraSPARC T1" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/UltraSPARC_T1" title="UltraSPARC T1 - rumeno" lang="ro" hreflang="ro" data-title="UltraSPARC T1" data-language-autonym="Română" data-language-local-name="rumeno" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/UltraSPARC_T1" title="UltraSPARC T1 - russo" lang="ru" hreflang="ru" data-title="UltraSPARC T1" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/UltraSPARC_T1" title="UltraSPARC T1 - cinese" lang="zh" hreflang="zh" data-title="UltraSPARC T1" data-language-autonym="中文" data-language-local-name="cinese" 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/Q956294#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</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="Namespace"> <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/UltraSPARC_T1" title="Vedi la voce [c]" accesskey="c"><span>Voce</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Discussione:UltraSPARC_T1" rel="discussion" title="Vedi le discussioni relative a questa pagina [t]" accesskey="t"><span>Discussione</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown 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data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Strumenti</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">nascondi</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Altre opzioni" > <div class="vector-menu-heading"> Azioni </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/UltraSPARC_T1"><span>Leggi</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=UltraSPARC_T1&amp;veaction=edit" title="Modifica questa pagina [v]" accesskey="v"><span>Modifica</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=UltraSPARC_T1&amp;action=edit" title="Modifica il wikitesto di questa pagina [e]" accesskey="e"><span>Modifica wikitesto</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=UltraSPARC_T1&amp;action=history"><span>Cronologia</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Generale </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Speciale:PuntanoQui/UltraSPARC_T1" title="Elenco di tutte le pagine che sono collegate a questa [j]" accesskey="j"><span>Puntano qui</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Speciale:ModificheCorrelate/UltraSPARC_T1" rel="nofollow" title="Elenco delle ultime modifiche alle pagine collegate a questa [k]" accesskey="k"><span>Modifiche correlate</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Speciale:PagineSpeciali" title="Elenco di tutte le pagine speciali [q]" accesskey="q"><span>Pagine speciali</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=UltraSPARC_T1&amp;oldid=136836443" title="Collegamento permanente a questa versione di questa pagina"><span>Link permanente</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=UltraSPARC_T1&amp;action=info" title="Ulteriori informazioni su questa pagina"><span>Informazioni pagina</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Speciale:Cita&amp;page=UltraSPARC_T1&amp;id=136836443&amp;wpFormIdentifier=titleform" title="Informazioni su come citare questa pagina"><span>Cita questa voce</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Speciale:UrlShortener&amp;url=https%3A%2F%2Fit.wikipedia.org%2Fwiki%2FUltraSPARC_T1"><span>Ottieni URL breve</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Speciale:QrCode&amp;url=https%3A%2F%2Fit.wikipedia.org%2Fwiki%2FUltraSPARC_T1"><span>Scarica codice QR</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"> Stampa/esporta </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=Speciale:Libro&amp;bookcmd=book_creator&amp;referer=UltraSPARC+T1"><span>Crea un libro</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Speciale:DownloadAsPdf&amp;page=UltraSPARC_T1&amp;action=show-download-screen"><span>Scarica come PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=UltraSPARC_T1&amp;printable=yes" title="Versione stampabile di questa pagina [p]" accesskey="p"><span>Versione stampabile</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"> In altri progetti </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/Q956294" title="Collegamento all&#039;elemento connesso dell&#039;archivio dati [g]" accesskey="g"><span>Elemento Wikidata</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="Strumenti pagine"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aspetto"> <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">Aspetto</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">nascondi</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">Da Wikipedia, l&#039;enciclopedia libera.</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="it" dir="ltr"><table class="infobox sinottico" summary="Tabella sinottica che riassume i principali dati del soggetto"><tbody><tr class="sinottico_testata"><th colspan="2" style="background-color:#CCF">UltraSPARC T1<br /><span class="sinottico_sottotitolo"><i><a href="/wiki/Central_processing_unit" class="mw-redirect" title="Central processing unit">Central processing unit</a></i></span></th></tr><tr><th>Prodotto</th><td>2005 </td></tr><tr><th>Progettato da</th><td><a href="/wiki/Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a> </td></tr><tr><th>Produttore</th><td><a href="/wiki/Texas_Instruments" title="Texas Instruments">Texas Instruments</a> </td></tr><tr><th>Successore</th><td><a href="/wiki/UltraSPARC_T2" title="UltraSPARC T2">UltraSPARC T2</a> </td></tr><tr class="sinottico_divisione"><th colspan="2" style="background-color:#CCF">Specifiche tecniche</th></tr><tr><th>Frequenza <a href="/wiki/CPU" title="CPU">CPU</a></th><td>1.0&#160;<a href="/wiki/GHz" class="mw-redirect" title="GHz">GHz</a> / 1.4&#160;<a href="/wiki/GHz" class="mw-redirect" title="GHz">GHz</a> </td></tr><tr><th><a href="/wiki/Set_di_istruzioni" class="mw-redirect" title="Set di istruzioni">Set di istruzioni</a></th><td><a href="/wiki/SPARC_V9" class="mw-redirect" title="SPARC V9">SPARC V9</a> </td></tr><tr><th>N° di <a href="/wiki/Core_(informatica)" class="mw-redirect" title="Core (informatica)">core</a> (CPU)</th><td>4, 6 o 8 </td></tr><tr><th><a href="/wiki/Thread_(informatica)" title="Thread (informatica)">Thread</a> per <a href="/wiki/Core_(informatica)" class="mw-redirect" title="Core (informatica)">core</a></th><td>4 </td></tr><tr><td class="sinottico_piede2 noprint nomobile metadata" colspan="2"><a href="https://www.wikidata.org/wiki/Q956294" class="extiw" title="d:Q956294"><span title="Modifica i dati della voce UltraSPARC T1 su Wikidata">Modifica dati su Wikidata</span></a><b>&#160;·</b> <a href="/wiki/Template:CPU/man" title="Template:CPU/man"><span title="Manuale del template CPU">Manuale</span></a></td></tr></tbody></table> <p>L&#39;<b>UltraSPARC T1</b> (conosciuto anche con il nome in codice di <b>Niagara</b>) è un <a href="/wiki/Microprocessore" title="Microprocessore">microprocessore</a> prodotto dalla <a href="/wiki/Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a> e distribuito dal 14 novembre <a href="/wiki/2005" title="2005">2005</a>. Il microprocessore è stato progettato per essere <a href="/wiki/Multi_core" class="mw-redirect" title="Multi core">multi core</a> e garantire il <a href="/wiki/Multithreading" title="Multithreading">multithreading</a>. Il suo progetto prevedeva come obiettivo primario la realizzazione di un chip a basso consumo per il mercato <a href="/wiki/Server" title="Server">server</a> ad una via. L'unità dissipa 72 Watt alla frequenza di 1,2&#160;GHz. </p><p>Il T1 deriva dai processori della serie <a href="/wiki/SPARC" title="SPARC">UltraSPARC</a>. È il primo microprocessore Sun multicore e multithread; difatti il T1 è dotato di otto <a href="/wiki/Core_(hardware)" class="mw-redirect" title="Core (hardware)">core</a> e ogni core è in grado di eseguire fino a 4 <a href="/wiki/Thread_(informatica)" title="Thread (informatica)">Thread</a> simultaneamente e quindi la CPU è in grado di eseguire fino a 32 thread simultaneamente. </p><p>Come i server ad alte prestazioni Sun l'UltraSPARC T1 può essere partizionato, in modo da poter assegnare uno o più core a compiti o utenti specifici. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Core">Core</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UltraSPARC_T1&amp;veaction=edit&amp;section=1" title="Modifica la sezione Core" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=UltraSPARC_T1&amp;action=edit&amp;section=1" title="Edit section&#039;s source code: Core"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Pipeline_Niagara.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Pipeline_Niagara.svg/310px-Pipeline_Niagara.svg.png" decoding="async" width="310" height="199" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Pipeline_Niagara.svg/465px-Pipeline_Niagara.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Pipeline_Niagara.svg/620px-Pipeline_Niagara.svg.png 2x" data-file-width="700" data-file-height="450" /></a><figcaption>Schema della pipeline di uno degli otto core</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Niagare.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Niagare.png/310px-Niagare.png" decoding="async" width="310" height="202" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Niagare.png/465px-Niagare.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Niagare.png/620px-Niagare.png 2x" data-file-width="1787" data-file-height="1162" /></a><figcaption>Architettura dell'UltraSPARC T1</figcaption></figure> <p>L'UltraSPARC T1 è stato progettato fin dall'inizio per l'esecuzione multithread di processi generici e introdusse una nuova architettura nata per ottenere alte prestazioni. Gli ingegneri, invece di puntare su un processore molto veloce, decisero di realizzare dei processori più semplici ma ottimizzati per eseguire molti processi in contemporanea, in modo da ottenere alte prestazioni su sistemi che eseguono molti processi concorrenti. </p><p>I <a href="/wiki/Core_(informatica)" class="mw-redirect" title="Core (informatica)">core</a> del T1 sono molto meno complessi dei core inclusi nelle moderne CPU ad alte prestazioni. Per esempio i core non supportano l'esecuzione delle <a href="/wiki/Esecuzione_fuori_ordine" title="Esecuzione fuori ordine">istruzioni fuori ordine</a> e non sono dotati di <a href="/wiki/CPU_cache" title="CPU cache">cache</a> di dimensioni generose. Le prestazioni dei singoli thread dipendono strettamente dalla presenza di cache di dimensioni generose, la mancanza di un dato in cache infatti introduce una notevole penalizzazione delle prestazioni dato che la memoria centrale è molto più lenta del processore. Una cache di ampie dimensioni riduce gli accessi alla memoria centrale e quindi migliora le prestazioni sebbene non possa ridurre il tempo di accesso alla memoria centrale. </p><p>Il processore T1 riesce a ridurre notevolmente la penalizzazione dell'accesso alla memoria utilizzando un approccio multithread. Quando un processore ha una cache miss (cioè non trova i dati necessari in memoria) il processore commuta su un altro thread disponibile e lo immette in esecuzione. Quindi sebbene i singoli thread siano rallentati dagli accessi alla memoria le prestazioni complessive del sistema sono elevate dato che il processore esegue in contemporanea molti thread. Analizzando la pipeline di un core infatti si nota che solamente la memoria e i registri sono replicati. Quindi ogni core può tenere in memoria fino a quattro thread sebbene ne possa eseguire solo uno alla volta. </p><p>I benchmark hanno dimostrato che nelle applicazioni commerciali questo approccio funziona molto bene. Applicazioni basate su Java application server, su application server e in generale su web server dimostrano la bontà di questo approccio. Questo genere di applicazioni creano tanti thread che singolarmente non richiedono elevata potenza di calcolo ma che nel complesso mettono sotto pressione i server dato che complessivamente assorbono elevate potenze di calcolo. I test hanno dimostrato che ogni core del processore genera una potenza di calcolo superiore a quella di un processore a singolo core e singolo thread UltraSPARC III (2001). Nell'esecuzione di più thread basati su aritmetica degli interi i core forniscono prestazioni significativamente superiori a quelli degli altri processori in commercio. </p><p>Quando venne presentato nel dicembre 2005 un server basato su un singolo processore a 8 core, 32 thread a 1,2&#160;GHz forniva prestazioni simili a quelle fornite da un server basato su 2 processori IBM <a href="/wiki/POWER" class="mw-redirect" title="POWER">POWER</a>5 a quattro core e otto thread con frequenza di 1,9&#160;GHz. Le prestazioni erano paragonabili a quelle generate anche da un server basato su quattro Intel <a href="/wiki/Xeon" title="Xeon">Xeon</a> <i>Paxville MP</i> con otto core e 16 thread a 3,0&#160;GHz e forniva prestazioni superiori a quelle di un server basato su quattro Intel <a href="/wiki/Itanium" title="Itanium">Itanium</a> con quattro core e quattro thread a 1,6&#160;GHz. </p> <div class="mw-heading mw-heading2"><h2 id="Mercati_di_riferimento">Mercati di riferimento</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UltraSPARC_T1&amp;veaction=edit&amp;section=2" title="Modifica la sezione Mercati di riferimento" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=UltraSPARC_T1&amp;action=edit&amp;section=2" title="Edit section&#039;s source code: Mercati di riferimento"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Il microprocessore è stato specificatamente sviluppato per alcuni mercati usualmente occupati dai server. Piuttosto che puntare sul settore del supercalcolo o delle applicazioni ad altissime prestazioni Sun ha deciso di privilegiare il settore dei server dedicati alle applicazioni internet come i <a href="/wiki/Web_server" class="mw-redirect" title="Web server">web server</a>. Questa tipologie di applicazioni richiedono la gestione di molti thread simultaneamente e infatti l'architettura della CPU è chiaramente indirizzata verso queste applicazioni, anche considerata la possibilità di una virtualizzazione hardware in grado di far girare su un solo processore a basso consumo parallelamente molte macchine virtuali. </p><p>Il processore dimostra le sue prestazioni anche nel caso di database di piccole e medie dimensioni con un discreto numero di utenti. Un test eseguito da un privato<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> le prestazioni di un database MySQL su un'UltraSPARC T1 surclassano un server basato su AMD Opteron. </p> <div class="mw-heading mw-heading2"><h2 id="Rock">Rock</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UltraSPARC_T1&amp;veaction=edit&amp;section=3" title="Modifica la sezione Rock" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=UltraSPARC_T1&amp;action=edit&amp;section=3" title="Edit section&#039;s source code: Rock"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Una delle limitazioni di queste scelte progettuali emerge nella gestione dei numeri in virgola mobile. La CPU, infatti, dispone di una sola unità di calcolo in virgola mobile, condivisa dagli 8 core. Al fine di sopperire a questa limitazione Sun ha avviato lo sviluppo di un nuovo microprocessore (nome in codice <a href="/wiki/Rock_(microprocessore)" title="Rock (microprocessore)">Rock</a>). Per via della sua architettura interna, dunque, il T1 non è un microprocessore <a href="/wiki/Multiprocessore_simmetrico" class="mw-redirect" title="Multiprocessore simmetrico">SMP</a>. Per questo Sun intendeva presentare <i>Rock</i>, con l'obiettivo di integrare l'SMP e risolvere il problema della singola unità di calcolo in virgola mobile. <i>Rock</i>, inoltre, doveva introdurre un aggressivo precaricamento del codice, in modo da evitare lo svuotamento delle <a href="/wiki/Pipeline_dati" class="mw-redirect" title="Pipeline dati">pipeline</a> e, dunque, rallentamenti dell'esecuzione. Nel maggio del 2010 quando il progetto del processore era quasi terminato Oracle (nuovo proprietario di Sun) decise di cancellare il progetto. </p><p>Rock comunque non era il successore dell'UltraSPARC T1. Sun ha sviluppato l'<a href="/wiki/UltraSPARC_T2" title="UltraSPARC T2">UltraSPARC T2</a> che è indirizzato allo stesso mercato del Niagara. L'UltraSPARC T2 è in grado di gestire 64 thread ed ha 8 unità di calcolo in virgola mobile. </p> <div class="mw-heading mw-heading2"><h2 id="Opensource">Opensource</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UltraSPARC_T1&amp;veaction=edit&amp;section=4" title="Modifica la sezione Opensource" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=UltraSPARC_T1&amp;action=edit&amp;section=4" title="Edit section&#039;s source code: Opensource"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Il 21 maggio 2006 Sun ha distribuito il processore UltraSPARC T1 sotto licenza <a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GNU General Public License</a> tramite il progetto <a href="/wiki/OpenSPARC" title="OpenSPARC">OpenSPARC</a>. Il progetto include: </p> <ul><li>Il codice <a href="/wiki/Verilog" title="Verilog">Verilog</a> del processore</li> <li>Programmi per la simulazione e il test del processore</li> <li>Specifiche dell'ISA (architettura UltraSPARC 2005)</li> <li>Il sistema operativo <a href="/wiki/Solaris_(sistema_operativo)" class="mw-redirect" title="Solaris (sistema operativo)">Solaris</a> 10</li></ul> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UltraSPARC_T1&amp;veaction=edit&amp;section=5" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=UltraSPARC_T1&amp;action=edit&amp;section=5" title="Edit section&#039;s source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1"><b>^</b></a> <span class="reference-text">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="http://blogs.digitar.com/media/2/T2000_Experience.pdf">Cruisin’ with a T2K</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110812174756/http://blogs.digitar.com/media/2/T2000_Experience.pdf">Archiviato</a> il 12 agosto 2011 in <a href="/wiki/Internet_Archive" title="Internet Archive">Internet Archive</a>.</span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Collegamenti_esterni">Collegamenti esterni</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=UltraSPARC_T1&amp;veaction=edit&amp;section=6" title="Modifica la sezione Collegamenti esterni" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=UltraSPARC_T1&amp;action=edit&amp;section=6" title="Edit section&#039;s source code: Collegamenti esterni"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><cite class="citation web" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="http://www.sun.com/processors/UltraSPARC-T1/"><span style="font-style:italic;">Sun Microsystems' official UltraSPARC T1 Processor information</span></a> <style data-mw-deduplicate="TemplateStyles:r140554517">.mw-parser-output .chiarimento{background:#ffeaea;color:#444444}.mw-parser-output .chiarimento-apice{color:#EE0700}@media screen{html.skin-theme-clientpref-night .mw-parser-output .chiarimento{background:rgba(179,36,36,0.21);color:inherit}html.skin-theme-clientpref-night .mw-parser-output .chiarimento-apice{color:#b32424}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .chiarimento{background:rgba(179,36,36,0.21);color:inherit}html.skin-theme-clientpref-os .mw-parser-output .chiarimento-apice{color:#b32424}}</style><span class="chiarimento" title="A volte può capitare che un link presente su Wikipedia non sia più raggiungibile. Se possibile ritrova il link e inserisci il collegamento corretto, comunque non rimuovere il collegamento e inserisci il template &#123;&#123;Collegamento interrotto&#125;&#125;"></span><sup class="noprint chiarimento-apice" title="A volte può capitare che un link presente su Wikipedia non sia più raggiungibile. Se possibile ritrova il link e inserisci il collegamento corretto, comunque non rimuovere il collegamento e inserisci il template &#123;&#123;Collegamento interrotto&#125;&#125;">&#91;<i><a href="/wiki/Aiuto:Collegamenti_interrotti" title="Aiuto:Collegamenti interrotti">collegamento interrotto</a></i>&#93;</sup>, su <span style="font-style:italic;">sun.com</span>.</cite></li> <li>(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="https://web.archive.org/web/20060118024728/http://www.reed-electronics.com/electronicnews/article/CA6283640.html">Sun Intros Eight-Core Processor</a> – By Jessica Davis, Electronic News, 14 Nov 2005</li> <li>(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="http://www.opensparc.org/">OpenSPARC</a> - Sun's open sourced UltraSPARC T1 design</li></ul> <style data-mw-deduplicate="TemplateStyles:r141815314">.mw-parser-output .navbox{border:1px solid #aaa;clear:both;margin:auto;padding:2px;width:100%}.mw-parser-output .navbox th{padding-left:1em;padding-right:1em;text-align:center}.mw-parser-output .navbox>tbody>tr:first-child>th{background:#ccf;font-size:90%;width:100%;color:var(--color-base,black)}.mw-parser-output .navbox_navbar{float:left;margin:0;padding:0 10px 0 0;text-align:left;width:6em}.mw-parser-output .navbox_title{font-size:110%}.mw-parser-output .navbox_abovebelow{background:#ddf;font-size:90%;font-weight:normal}.mw-parser-output .navbox_group{background:#ddf;font-size:90%;padding:0 10px;white-space:nowrap}.mw-parser-output .navbox_list{font-size:90%;width:100%}.mw-parser-output .navbox_list a{white-space:nowrap}html:not(.vector-feature-night-mode-enabled) .mw-parser-output .navbox_odd{background:#fdfdfd;color:var(--color-base,black)}html:not(.vector-feature-night-mode-enabled) .mw-parser-output .navbox_even{background:#f7f7f7;color:var(--color-base,black)}.mw-parser-output .navbox a.mw-selflink{color:var(--color-base,black)}.mw-parser-output .navbox_center{text-align:center}.mw-parser-output .navbox .navbox_image{padding-left:7px;vertical-align:middle;width:0}.mw-parser-output .navbox+.navbox{margin-top:-1px}.mw-parser-output .navbox .mw-collapsible-toggle{font-weight:normal;text-align:right;width:7em}body.skin--responsive .mw-parser-output .navbox_image img{max-width:none!important}.mw-parser-output .subnavbox{margin:-3px;width:100%}.mw-parser-output .subnavbox_group{background:#e6e6ff;padding:0 10px}@media screen{html.skin-theme-clientpref-night .mw-parser-output .navbox>tbody>tr:first-child>th{background:var(--background-color-interactive)!important}html.skin-theme-clientpref-night .mw-parser-output .navbox th{color:var(--color-base)!important}html.skin-theme-clientpref-night .mw-parser-output .navbox_abovebelow,html.skin-theme-clientpref-night .mw-parser-output .navbox_group{background:var(--background-color-interactive-subtle)!important}html.skin-theme-clientpref-night .mw-parser-output .subnavbox_group{background:var(--background-color-neutral-subtle)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbox>tbody>tr:first-child>th{background:var(--background-color-interactive)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox th{color:var(--color-base)!important}html.skin-theme-clientpref-os .mw-parser-output .navbox_abovebelow,html.skin-theme-clientpref-os .mw-parser-output .navbox_group{background:var(--background-color-interactive-subtle)!important}html.skin-theme-clientpref-os .mw-parser-output .subnavbox_group{background:var(--background-color-neutral-subtle)!important}}</style><table class="navbox mw-collapsible mw-collapsed noprint metadata" id="navbox-Hardware_Sun"><tbody><tr><th colspan="2"><div class="navbox_navbar"><div class="noprint plainlinks" style="background-color:transparent; padding:0; font-size:xx-small; color:var(--color-base, #000000); white-space:nowrap;"><a href="/wiki/Template:Hardware_Sun" title="Template:Hardware Sun"><span title="Vai alla pagina del template">V</span></a>&#160;·&#160;<a href="/w/index.php?title=Discussioni_template:Hardware_Sun&amp;action=edit&amp;redlink=1" class="new" title="Discussioni template:Hardware Sun (la pagina non esiste)"><span title="Discuti del template">D</span></a>&#160;·&#160;<a class="external text" href="https://it.wikipedia.org/w/index.php?title=Template:Hardware_Sun&amp;action=edit"><span title="Modifica il template. Usa l&#39;anteprima prima di salvare">M</span></a></div></div><span class="navbox_title"><a href="/wiki/Hardware" title="Hardware">Hardware</a> sviluppato da <a href="/wiki/Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a> <small>(una sussidiaria di <a href="/wiki/Oracle_Corporation" title="Oracle Corporation">Oracle Corporation</a>)</small></span></th></tr><tr><th colspan="1" class="navbox_group">Processori</th><td colspan="1" class="navbox_list navbox_odd"><a href="/wiki/SPARC" title="SPARC">SPARC</a><b>&#160;·</b> <a href="/w/index.php?title=MB86900&amp;action=edit&amp;redlink=1" class="new" title="MB86900 (la pagina non esiste)">MB86900</a><b>&#160;·</b> <a href="/w/index.php?title=MicroSPARC&amp;action=edit&amp;redlink=1" class="new" title="MicroSPARC (la pagina non esiste)">microSPARC</a><b>&#160;·</b> <a href="/w/index.php?title=SuperSPARC&amp;action=edit&amp;redlink=1" class="new" title="SuperSPARC (la pagina non esiste)">SuperSPARC</a><b>&#160;·</b> <a href="/wiki/UltraSPARC" title="UltraSPARC">UltraSPARC</a><b>&#160;·</b> <a href="/w/index.php?title=UltraSPARC_II&amp;action=edit&amp;redlink=1" class="new" title="UltraSPARC II (la pagina non esiste)">UltraSPARC II</a> (UltraSPARC IIe, UltraSPARC IIi, Gemini)<b>&#160;·</b> <a href="/wiki/UltraSPARC_III" title="UltraSPARC III">UltraSPARC III</a> (UltraSPARC III Cu, UltraSPARC IIIi)<b>&#160;·</b> <a href="/w/index.php?title=UltraSPARC_IV&amp;action=edit&amp;redlink=1" class="new" title="UltraSPARC IV (la pagina non esiste)">UltraSPARC IV</a><b>&#160;·</b> <a class="mw-selflink selflink">UltraSPARC T1</a><b>&#160;·</b> <a href="/wiki/UltraSPARC_T2" title="UltraSPARC T2">UltraSPARC T2</a><b>&#160;·</b> <a href="/wiki/SPARC_T3" title="SPARC T3">SPARC T3</a><b>&#160;·</b> <a href="/wiki/SPARC_T4" title="SPARC T4">SPARC T4</a><b>&#160;·</b> <a href="/wiki/Rock_(microprocessore)" title="Rock (microprocessore)">Rock</a><b>&#160;·</b> <a href="/w/index.php?title=MAJC&amp;action=edit&amp;redlink=1" class="new" title="MAJC (la pagina non esiste)">MAJC</a></td></tr><tr><th colspan="1" class="navbox_group">Workstations &amp; servers</th><td colspan="1" class="navbox_list navbox_even"><a href="/w/index.php?title=Sun-1&amp;action=edit&amp;redlink=1" class="new" title="Sun-1 (la pagina non esiste)">Sun-1</a><b>&#160;·</b> <a href="/w/index.php?title=Sun-2&amp;action=edit&amp;redlink=1" class="new" title="Sun-2 (la pagina non esiste)">Sun-2</a><b>&#160;·</b> <a href="/w/index.php?title=Sun-3&amp;action=edit&amp;redlink=1" class="new" title="Sun-3 (la pagina non esiste)">Sun-3</a><b>&#160;·</b> <a href="/w/index.php?title=Sun386i&amp;action=edit&amp;redlink=1" class="new" title="Sun386i (la pagina non esiste)">Sun386i</a><b>&#160;·</b> <a href="/w/index.php?title=Sun-4&amp;action=edit&amp;redlink=1" class="new" title="Sun-4 (la pagina non esiste)">Sun-4</a><b>&#160;·</b> <a href="/w/index.php?title=SPARCstation&amp;action=edit&amp;redlink=1" class="new" title="SPARCstation (la pagina non esiste)"> SPARCstation/server/center</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Netra&amp;action=edit&amp;redlink=1" class="new" title="Sun Netra (la pagina non esiste)">Netra</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Ultra_series&amp;action=edit&amp;redlink=1" class="new" title="Sun Ultra series (la pagina non esiste)">Ultra</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Enterprise&amp;action=edit&amp;redlink=1" class="new" title="Sun Enterprise (la pagina non esiste)">Enterprise</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Blade&amp;action=edit&amp;redlink=1" class="new" title="Sun Blade (la pagina non esiste)">Sun Blade</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Fire&amp;action=edit&amp;redlink=1" class="new" title="Sun Fire (la pagina non esiste)">Sun Fire</a><b>&#160;·</b> <a href="/w/index.php?title=Java_Workstation&amp;action=edit&amp;redlink=1" class="new" title="Java Workstation (la pagina non esiste)">Java Workstation</a><b>&#160;·</b> <a href="/w/index.php?title=SPARC_Enterprise&amp;action=edit&amp;redlink=1" class="new" title="SPARC Enterprise (la pagina non esiste)">SPARC Enterprise</a></td></tr><tr><th colspan="1" class="navbox_group">Network computer</th><td colspan="1" class="navbox_list navbox_odd"><a href="/w/index.php?title=JavaStation&amp;action=edit&amp;redlink=1" class="new" title="JavaStation (la pagina non esiste)">JavaStation</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Ray&amp;action=edit&amp;redlink=1" class="new" title="Sun Ray (la pagina non esiste)">Sun Ray</a></td></tr><tr><th colspan="1" class="navbox_group">Storage</th><td colspan="1" class="navbox_list navbox_even"><a href="/w/index.php?title=Sun_StorageTek_5800_System&amp;action=edit&amp;redlink=1" class="new" title="Sun StorageTek 5800 System (la pagina non esiste)">StorageTek 5800</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Fire_X4500&amp;action=edit&amp;redlink=1" class="new" title="Sun Fire X4500 (la pagina non esiste)">Sun Fire X4500</a></td></tr><tr><th colspan="1" class="navbox_group">Altro</th><td colspan="1" class="navbox_list navbox_odd"><a href="/wiki/Sun_Modular_Datacenter" title="Sun Modular Datacenter">Sun Modular Datacenter</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_SPOT&amp;action=edit&amp;redlink=1" class="new" title="Sun SPOT (la pagina non esiste)">Sun SPOT</a><b>&#160;·</b> <a href="/w/index.php?title=Sun_Neptune&amp;action=edit&amp;redlink=1" class="new" title="Sun Neptune (la pagina non esiste)">Sun Neptune</a></td></tr></tbody></table> <div class="noprint" style="width:100%; 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