{"id":54872,"date":"2020-01-06T00:00:00","date_gmt":"2020-01-05T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti"},"modified":"2020-02-18T14:02:55","modified_gmt":"2020-02-18T11:02:55","slug":"linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds odrzuci\u0142 problemy z planerem zada\u0144, kt\u00f3re pojawi\u0142y si\u0119 w te\u015bcie wydajno\u015bci","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Tw\u00f3rca gier Malte Skarupke <noindex><a rel=\"nofollow\" href=\"https:\/\/probablydance.com\/2019\/12\/30\/measuring-mutexes-spinlocks-and-how-bad-the-linux-scheduler-really-is\/\">opublikowa\u0142<\/a><\/noindex> por\u00f3wnanie wydajno\u015bci blokad opartych na <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9C%D1%8C%D1%8E%D1%82%D0%B5%D0%BA%D1%81\">Mutex<\/a><\/noindex> i <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Spinlock\">Spinlock<\/a><\/noindex> przy u\u017cyciu r\u00f3\u017cnych planist\u00f3w zada\u0144. Testy wykaza\u0142y anormalnie du\u017ce op\u00f3\u017anienia przy u\u017cyciu Spinlock z domy\u015blnym planist\u0105 zada\u0144 w systemie Linux. Autor test\u00f3w doszed\u0142 do wniosku, \u017ce planista zada\u0144 w Linuxie ma problemy, kt\u00f3re negatywnie wp\u0142ywaj\u0105 na dzia\u0142anie gier tworzonych dla us\u0142ugi Google Stadia, w kt\u00f3rej gry s\u0105 wykonywane na GPU w chmurze, a klient otrzymuje jedynie strumieniowane tre\u015bci wideo z cz\u0119stotliwo\u015bci\u0105 do 60 klatek na sekund\u0119. W takich warunkach nale\u017cy zapewni\u0107 terminowe wy\u015bwietlanie klatek na ekranie, a op\u00f3\u017anienia przekraczaj\u0105ce milisekund\u0119 staj\u0105 si\u0119 zauwa\u017calne.<\/p>\n<p>Do dyskusji na temat test\u00f3w <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189723\">zaanga\u017cowa\u0142 si\u0119<\/a><\/noindex> Linus Torvalds, kt\u00f3ry nazwa\u0142 je \u015bmieciem (&#171;pure garbage&#187;) i przyk\u0142adem tego, jak mo\u017cna, nie zag\u0142\u0119biaj\u0105c si\u0119 w temat, uzyska\u0107 wyniki, kt\u00f3re nie odzwierciedlaj\u0105 rzeczywisto\u015bci. Spinlock jest niskopoziomowym prymitywem, kt\u00f3ry w przestrzeni u\u017cytkownika nale\u017cy stosowa\u0107 z du\u017c\u0105 ostro\u017cno\u015bci\u0105 i pe\u0142nym zrozumieniem szczeg\u00f3\u0142\u00f3w, w przeciwnym razie mo\u017cna uzyska\u0107 to, co zosta\u0142o zademonstrowane przez autora testu. Linus doradzi\u0142 deweloperom gier, aby nie stosowali spinlocka i nie pr\u00f3bowali tworzy\u0107 w\u0142asnych system\u00f3w blokowania na jego podstawie, a raczej u\u017cywali istniej\u0105cych, sprawdzonych mechanizm\u00f3w, kt\u00f3re informuj\u0105 system o oczekiwaniu na zwolnienie blokady, aby wykluczy\u0107 wp\u0142yw planisty. <\/p>\n<p>Rozszerzenia oparte na Spinlocku mo\u017cna stosowa\u0107 tylko w przypadku pe\u0142nej pewno\u015bci, \u017ce planista nie przerwie ich wykonania. Blokady stosowane w testach opartych na spinlocku s\u0105 realizowane przez r\u0119cznie wykonan\u0105 obudow\u0119, dzia\u0142aj\u0105c\u0105 w przestrzeni u\u017cytkownika. Planista zada\u0144 mo\u017ce w ka\u017cdej chwili przej\u0105\u0107 kontrol\u0119 podczas wykonywania tej obudowy i prze\u0142\u0105czy\u0107 si\u0119 na realizacj\u0119 innego zadania. Poniewa\u017c pomiar wydajno\u015bci jest realizowany na podstawie warto\u015bci bezwzgl\u0119dnych zegara, pewne czasy op\u00f3\u017anienia w testach obejmuj\u0105 nie tylko op\u00f3\u017anienia w obs\u0142udze blokady, ale tak\u017ce kod, kt\u00f3ry by\u0142 wykonywany w innym kontek\u015bcie, tzn. mierz\u0105 nie tylko to, co pr\u00f3bowa\u0142 zmierzy\u0107 autor testu, ale tak\u017ce &#171;szum&#187; z innych oblicze\u0144 w systemie.<\/p>\n<p>Autor testu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189747\">pr\u00f3bowa\u0142<\/a><\/noindex> Zgadza\u0107 si\u0119 z Linusem, wskazuj\u0105c, \u017ce stosowanie w\u0142asnych system\u00f3w blokowania opartych na spinlock cz\u0119sto znajduje zastosowanie w grach, poniewa\u017c przy u\u017cyciu prostszych planist\u00f3w ni\u017c w Linuxie testy pokazuj\u0105 wy\u017csz\u0105 wydajno\u015b\u0107. Linus <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189752\">sprzeciwi\u0142 si\u0119<\/a><\/noindex>, \u017ce planista Linux jest uniwersalny, doskonalony przez dziesi\u0119ciolecia i zoptymalizowany nie tylko pod k\u0105tem komputer\u00f3w osobistych i gier, ale tak\u017ce innych rodzaj\u00f3w obci\u0105\u017cenia, na przyk\u0142ad system\u00f3w serwerowych, dlatego uwzgl\u0119dnia wiele niuans\u00f3w podczas planowania wykonywania zada\u0144. <\/p>\n<p>Dodanie specyficznych optymalizacji, kt\u00f3re pozwol\u0105 na zmniejszenie op\u00f3\u017anie\u0144 w grach Google Stadia, mo\u017ce zwi\u0119kszy\u0107 responsywno\u015b\u0107 w danym przypadku, ale prawdopodobnie prowadzi do obni\u017cenia efektywno\u015bci planisty jako ca\u0142o\u015bci. Na przyk\u0142ad, planista Windows dzia\u0142a lepiej w omawianych testach, poniewa\u017c jest znacznie prostszy ni\u017c planista Linux i zoptymalizowany g\u0142\u00f3wnie pod k\u0105tem zada\u0144 specyficznych dla komputer\u00f3w osobistych.<\/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=52140\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u0438\u0433\u0440 Malte Skarupke \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043e\u043a \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 Mutex \u0438 Spinlock \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u0432 \u0437\u0430\u0434\u0430\u0447. \u0422\u0435\u0441\u0442\u044b \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u0438 \u0430\u043d\u043e\u043c\u0430\u043b\u044c\u043d\u043e \u0431\u043e\u043b\u044c\u0448\u0438\u0435 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 Spinlock \u0441 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u043c \u0432 Linux \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u043c \u0437\u0430\u0434\u0430\u0447. \u0410\u0432\u0442\u043e\u0440 \u0442\u0435\u0441\u0442\u043e\u0432 \u0441\u0434\u0435\u043b\u0430\u043b \u0432\u044b\u0432\u043e\u0434, \u0447\u0442\u043e \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a \u0437\u0430\u0434\u0430\u0447 Linux \u0438\u043c\u0435\u0435\u0442 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043d\u0435\u0433\u0430\u0442\u0438\u0432\u043d\u043e \u0441\u043a\u0430\u0437\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u0440\u0430\u0431\u043e\u0442\u0435 \u0438\u0433\u0440, \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0445 \u0434\u043b\u044f \u0441\u0435\u0440\u0432\u0438\u0441\u0430 Google Stadia, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-54872","post","type-post","status-publish","format-standard","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=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u0438\u0433\u0440 Malte Skarupke \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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