{"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\/pl\/blog\/news\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","title":{"rendered":"Projekt dodania wsparcia dla r\u00f3wnoleg\u0142ego procesu kompilacji w GCC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>W ramach projektu badawczego <noindex><a rel=\"nofollow\" href=\"https:\/\/gcc.gnu.org\/wiki\/ParallelGcc\">Parallel GCC<\/a><\/noindex> rozpocz\u0119to prac\u0119 nad dodaniem do GCC mo\u017cliwo\u015bci, kt\u00f3ra pozwala na podzia\u0142 procesu kompilacji na kilka r\u00f3wnolegle wykonuj\u0105cych si\u0119 w\u0105tk\u00f3w. Obecnie, aby zwi\u0119kszy\u0107 szybko\u015b\u0107 kompilacji na systemach wielordzeniowych, na poziomie narz\u0119dzia make stosuje si\u0119 uruchamianie oddzielnych proces\u00f3w kompilatora, z kt\u00f3rych ka\u017cdy wykonuje kompilacj\u0119 osobnego pliku z kodem. Nowy projekt eksperymentuje z zapewnieniem r\u00f3wnoleg\u0142o\u015bci na poziomie kompilatora, co potencjalnie pozwoli zwi\u0119kszy\u0107 efektywno\u015b\u0107 pracy na systemach wielordzeniowych. <\/p>\n<p>Do testowania <noindex><a rel=\"nofollow\" href=\"https:\/\/gitlab.com\/flusp\/gcc\/tree\/giulianob_parallel\">przygotowano<\/a><\/noindex> oddzielna ga\u0142\u0105\u017a r\u00f3wnoleg\u0142ego przetwarzania GCC, w kt\u00f3rej wprowadzono nowy parametr &#171;&#8212;param=num-threads=N&#187; do okre\u015blenia liczby w\u0105tk\u00f3w. Na pocz\u0105tkowym etapie zrealizowano przeniesienie optymalizacji mi\u0119dzyproceduralnych do oddzielnych w\u0105tk\u00f3w, kt\u00f3re s\u0105 cyklicznie wywo\u0142ywane dla ka\u017cdej funkcji i dobrze nadaj\u0105 si\u0119 do r\u00f3wnoleg\u0142ego przetwarzania. Do oddzielnych w\u0105tk\u00f3w przeniesiono operacje GIMPLE, odpowiadaj\u0105ce za optymalizacje niezale\u017cne od sprz\u0119tu, oceniaj\u0105ce interakcje mi\u0119dzy funkcjami.<\/p>\n<p>Na nast\u0119pnym etapie planuje si\u0119 r\u00f3wnie\u017c wydzielenie mi\u0119dzyproceduralnych optymalizacji RTL do oddzielnych w\u0105tk\u00f3w, uwzgl\u0119dniaj\u0105cych cechy platformy sprz\u0119towej. Po tym planuje si\u0119 zrealizowanie r\u00f3wnoleglenia wewn\u0105trzproceduralnych optymalizacji (IPA), stosowanych do kodu wewn\u0105trz funkcji, niezale\u017cnie od szczeg\u00f3\u0142\u00f3w wywo\u0142ania. Ograniczaj\u0105cym czynnikiem jest na razie zbieracz \u015bmieci, do kt\u00f3rego dodano globaln\u0105 blokad\u0119 wy\u0142\u0105czaj\u0105c\u0105 operacje zbierania \u015bmieci podczas pracy w trybie wielow\u0105tkowym (w przysz\u0142o\u015bci zbieracz \u015bmieci zostanie dostosowany do wielow\u0105tkowego wykonania GCC).<\/p>\n<p>Aby oceni\u0107 zmiany w wydajno\u015bci, przygotowano zestaw test\u00f3w, realizuj\u0105cych kompilacj\u0119 pliku gimple-match.c, zawieraj\u0105cego ponad 100 tysi\u0119cy linii kodu i 1700 funkcji. Testy na systemie z procesorem Intel Core i5-8250U z 4 fizycznymi rdzeniami i 8 wirtualnymi (Hyperthreading) wykaza\u0142y zmniejszenie czasu realizacji optymalizacji Intra Procedural GIMPLE z 7 do 4 sekund przy uruchomieniu 2 w\u0105tk\u00f3w oraz do 3 sekund przy uruchomieniu 4 w\u0105tk\u00f3w, co oznacza wzrost szybko\u015bci rozpatrywanego etapu kompilacji odpowiednio o 1.72 i 2.52 razy. Testy wykaza\u0142y r\u00f3wnie\u017c, \u017ce u\u017cycie rdzeni wirtualnych przy Hyperthreading nie prowadzi do wzrostu wydajno\u015bci. <\/p>\n<p><center><img decoding=\"async\" alt=\"Projekt dodania wsparcia dla r\u00f3wnoleg\u0142ego procesu kompilacji w GCC\" src=\"\/wp-content\/uploads\/2019\/09\/c2d0ed085f0247e497e671c13cb06505.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>Ca\u0142kowity czas kompilacji skr\u00f3ci\u0142 si\u0119 o oko\u0142o 10%, jednak prognozy wskazuj\u0105, \u017ce r\u00f3wnoleg\u0142e optymalizacje RTL przynios\u0105 bardziej wymierne rezultaty, poniewa\u017c ten etap zajmuje znacznie wi\u0119cej czasu podczas kompilacji. Szacunkowo po r\u00f3wnoleg\u0142ym przetwarzaniu RTL ca\u0142kowity czas kompilacji skr\u00f3ci si\u0119 w 1,61 raza. Dodatkowo, jeszcze o 5-10% mo\u017cna zredukowa\u0107 czas kompilacji dzi\u0119ki r\u00f3wnoleg\u0142emu przetwarzaniu optymalizacji IPA.<\/p>\n<p><center><img decoding=\"async\" alt=\"Projekt dodania wsparcia dla r\u00f3wnoleg\u0142ego procesu kompilacji w GCC\" 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>\u0179r\u00f3d\u0142o: <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-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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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