{"id":38137,"date":"2019-10-31T22:21:53","date_gmt":"2019-10-31T19:21:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii\/"},"modified":"2019-10-31T22:21:53","modified_gmt":"2019-10-31T19:21:53","slug":"proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","title":{"rendered":"Progetto per l'aggiunta al GCC del supporto per il parallelismo nel processo di compilazione","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nell'ambito del progetto di ricerca <noindex><a rel=\"nofollow\" href=\"https:\/\/gcc.gnu.org\/wiki\/ParallelGcc\">Parallel GCC<\/a><\/noindex> \u00e8 iniziato il lavoro per aggiungere a GCC la possibilit\u00e0 di suddividere il processo di compilazione in pi\u00f9 flussi eseguiti in parallelo. Attualmente, per aumentare la velocit\u00e0 di compilazione su sistemi multicore, viene utilizzato il lancio di singoli processi del compilatore a livello di utility make, ciascuno dei quali compila un file di codice separato. Il nuovo progetto sperimenta la fornitura di parallelismo a livello di compilatore, il che potrebbe aumentare l'efficienza delle operazioni su sistemi multicore. <\/p>\n<p>Per il test <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/flusp\/gcc\/tree\/giulianob_parallel\">\u00e8 stata preparata<\/a><\/noindex> un ramo parallelo separato di GCC, per il quale \u00e8 stato proposto un nuovo parametro &#171;&#8212;param=num-threads=N&#187; per impostare il numero di thread. Nella fase iniziale, sono state implementate ottimizzazioni interprocedurali in thread separati, che vengono chiamate ciclicamente per ogni funzione e si prestano bene alla parallelizzazione. Sono state estratte in thread separati le operazioni GIMPLE, responsabili di ottimizzazioni indipendenti dall'hardware, che valutano l'interazione tra le funzioni.<\/p>\n<p>Nella fase successiva si prevede di estrarre in thread separati anche le ottimizzazioni RTL interprocedurali, tenendo conto delle peculiarit\u00e0 della piattaforma hardware. Successivamente, si prevede di attuare la parallelizzazione delle ottimizzazioni intraprocedurali (IPA), applicabili al codice all'interno della funzione, indipendentemente dalle peculiarit\u00e0 della chiamata. Attualmente, il vincolo principale \u00e8 il garbage collector, al quale \u00e8 stata aggiunta una global lock che disabilita le operazioni di raccolta dei rifiuti durante il funzionamento in modalit\u00e0 multithreading (in futuro, il garbage collector sar\u00e0 adattato per l'esecuzione multithread di GCC).<\/p>\n<p>Per valutare il cambiamento delle prestazioni, \u00e8 stato preparato un set di test che compila il file gimple-match.c, contenente oltre 100.000 righe di codice e 1.700 funzioni. I test su un sistema con CPU Intel Core i5-8250U, dotato di 4 core fisici e 8 virtuali (Hyperthreading), hanno mostrato una diminuzione del tempo di esecuzione delle ottimizzazioni Intra Procedural GIMPLE da 7 a 4 secondi con 2 thread attivi e a 3 secondi con 4 thread, con un aumento della velocit\u00e0 di questo fase di compilazione di 1,72 e 2,52 volte, rispettivamente. I test hanno anche dimostrato che l'uso di core virtuali con Hyperthreading non porta a un incremento delle prestazioni. <\/p>\n<p><center><img decoding=\"async\" alt=\"Progetto per l&#039;aggiunta al GCC del supporto per il parallelismo nel processo di compilazione\" src=\"\/wp-content\/uploads\/2019\/09\/c2d0ed085f0247e497e671c13cb06505.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>Il tempo totale di compilazione \u00e8 stato ridotto di circa il 10%, ma si prevede che la parallelizzazione delle ottimizzazioni RTL porter\u00e0 a risultati pi\u00f9 significativi, poich\u00e9 questa fase richiede molto pi\u00f9 tempo durante la compilazione. Si stima che, dopo la parallelizzazione delle ottimizzazioni RTL, il tempo totale di compilazione sar\u00e0 ridotto di 1,61 volte. Successivamente, si potr\u00e0 ridurre ulteriormente il tempo di compilazione del 5-10% grazie alla parallelizzazione delle ottimizzazioni IPA.<\/p>\n<p><center><img decoding=\"async\" alt=\"Progetto per l&#039;aggiunta al GCC del supporto per il parallelismo nel processo di compilazione\" src=\"\/wp-content\/uploads\/2019\/09\/efea1dac269fb10e57a05778e5e1467f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51491\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0440\u0430\u043c\u043a\u0430\u0445 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Parallel GCC \u043d\u0430\u0447\u0430\u043b\u0430\u0441\u044c \u0440\u0430\u0431\u043e\u0442\u0430 \u043f\u043e \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044e \u0432 GCC \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u0440\u0430\u0437\u0434\u0435\u043b\u044f\u0442\u044c \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0446\u0438\u0438 \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u044c\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u043f\u043e\u0442\u043e\u043a\u043e\u0432. \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u0434\u043b\u044f \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u0438 \u0441\u0431\u043e\u0440\u043a\u0438 \u043d\u0430 \u043c\u043d\u043e\u0433\u043e\u044f\u0434\u0435\u0440\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0443\u0442\u0438\u043b\u0438\u0442\u044b make \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0437\u0430\u043f\u0443\u0441\u043a \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u0430, \u043a\u0430\u0436\u0434\u044b\u0439 \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0441\u0431\u043e\u0440\u043a\u0443 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430 \u0441 \u043a\u043e\u0434\u043e\u043c. \u041d\u043e\u0432\u044b\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0438\u0440\u0443\u0435\u0442 \u0441 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u0435\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28626,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-38137","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0440\u0430\u043c\u043a\u0430\u0445 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Parallel GCC \u043d\u0430\u0447\u0430\u043b\u0430\u0441\u044c \u0440\u0430\u0431\u043e\u0442\u0430 \u043f\u043e \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044e \u0432 GCC \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438, 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Attualmente, per aumentare la velocit\u00e0 di compilazione sui sistemi multicore, si utilizza l'avvio di singoli processi del compilatore a livello dell'utilit\u00e0 make, ciascuno dei quali esegue la compilazione di un singolo file di codice. 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