{"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\/nl\/blog\/news\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds heeft de problemen met de taakplanner, die naar voren kwamen tijdens de prestatietests, ontkend.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Game developer Malte Skarupke <noindex><a rel=\"nofollow\" href=\"https:\/\/probablydance.com\/2019\/12\/30\/measuring-mutexes-spinlocks-and-how-bad-the-linux-scheduler-really-is\/\">gepubliceerd<\/a><\/noindex> performance comparison of locks based on <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> en <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Spinlock\">Spinlock<\/a><\/noindex> the use of various task schedulers. Tests showed abnormally large delays when using Spinlock with the default task scheduler used in Linux. The author of the tests concluded that the Linux task scheduler has issues that negatively impact the performance of games designed for the Google Stadia service, where games run on a GPU in a cloud environment, and the client only streams the screen content at up to 60 frames per second. Under such conditions, timely output of frames to the screen is crucial, and delays exceeding a millisecond become noticeable.<\/p>\n<p>For discussion of the tests <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189723\">joined<\/a><\/noindex> Linus Torvalds, die hen rommel (&#171;pure garbage&#187;) noemde en als voorbeeld van hoe je, zonder volledig in het onderwerp te begrijpen, statistieken kunt krijgen die de werkelijke werkelijkheid niet weerspiegelen. Spinlock is een laagdrempelige primitieve die met grote voorzichtigheid en volledig begrip van de details in de gebruikersruimte moet worden gebruikt, anders kun je krijgen wat de auteur van de test heeft gedemonstreerd. Linus adviseerde game-ontwikkelaars om geen spinlock te gebruiken en niet te proberen hun eigen vergrendelingssystemen op basis daarvan te maken, maar gebruik te maken van bestaande, bewezen mechanismen die het systeem informeren over het wachten op het vrijgeven van de vergrendeling om de invloed van de scheduler uit te sluiten. <\/p>\n<p>Verhogingen op basis van Spinlock kunnen alleen worden gebruikt als je er volledig zeker van bent dat de scheduler hun uitvoering niet zal onderbreken. De in de tests gebruikte vergrendelingen op basis van spinlock zijn ge\u00efmplementeerd via een zelfgemaakte wrapper die in de gebruikersruimte werkt. De taakplanner kan op elk willekeurig moment de controle overnemen tijdens de uitvoering van deze wrapper en overschakelen naar de uitvoering van een andere taak. Aangezien de prestatiemeting is gebaseerd op absolute timerwaarden, de in de testen gedefinieerde vertragingen dekken niet alleen de vertragingen in de vergrendelingshandler, maar ook de code die in een andere context is uitgevoerd; dat wil zeggen, ze meten niet alleen wat de auteur van de test probeerde te meten, maar ook de &#171;ruis&#187; van andere berekeningen in het systeem.<\/p>\n<p>Test author <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189747\">probeerde<\/a><\/noindex> om Linus te weerleggen door aan te geven dat het gebruik van eigen blokkadesystemen op basis van spinlock vaak in de praktijk wordt gebruikt in games, omdat tests met eenvoudigere planningssystemen dan in Linux hogere prestaties laten zien. Linus <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189752\">weigerde<\/a><\/noindex>, dat de Linux-planner universeel is, decennialang is verfijnd en is geoptimaliseerd niet alleen voor desktops en games, maar ook voor andere soorten belasting, zoals serversystemen, en daarom rekening houdt met veel nuances bij het plannen van taakuitvoeringen. <\/p>\n<p>Het toevoegen van specifieke optimalisaties die de latentie in Google Stadia-games kunnen verlagen, kan de reactiesnelheid in een specifiek geval verbeteren, maar zal waarschijnlijk leiden tot een vermindering van de effici\u00ebntie van de planner in het algemeen. Bijvoorbeeld, de Windows-planner presteert beter in de besproken tests, omdat hij aanzienlijk eenvoudiger is dan de Linux-planner en voornamelijk is geoptimaliseerd voor desktop-specifieke taken.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Bron: <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 5.0.3 - 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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