{"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\/sv\/blog\/news\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds avf\u00e4rdade problemen med schemal\u00e4ggaren som uppkom i prestandatestet.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Spelutvecklare Malte Skarupke <noindex><a rel=\"nofollow\" href=\"https:\/\/probablydance.com\/2019\/12\/30\/measuring-mutexes-spinlocks-and-how-bad-the-linux-scheduler-really-is\/\">publicerade<\/a><\/noindex> j\u00e4mf\u00f6relse av prestandan f\u00f6r l\u00e5s i <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> och <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Spinlock\">Spinlock<\/a><\/noindex> anv\u00e4ndning av olika schemal\u00e4ggare. Tester visade onormalt stora f\u00f6rdr\u00f6jningar med Spinlock och den schemal\u00e4ggare som anv\u00e4nds som standard i Linux. F\u00f6rfattaren av testerna drog slutsatsen att Linux-schemal\u00e4ggaren har problem som negativt p\u00e5verkar spel skapade f\u00f6r Google Stadia-tj\u00e4nsten, d\u00e4r spel k\u00f6rs p\u00e5 GPU i en molnmilj\u00f6, och kunden bara f\u00e5r en str\u00f6m av inneh\u00e5llet p\u00e5 sk\u00e4rmen med en uppdateringsfrekvens p\u00e5 upp till 60 bilder per sekund. Under s\u00e5dana f\u00f6rh\u00e5llanden \u00e4r det n\u00f6dv\u00e4ndigt att s\u00e4kerst\u00e4lla att bilderna visas i tid, och f\u00f6rdr\u00f6jningar som \u00f6verskrider en millisekund blir m\u00e4rkbara.<\/p>\n<p>Till diskussion av testerna <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189723\">drog ig\u00e5ng<\/a><\/noindex> Linus Torvalds, som kallade dem skr\u00e4p (\u201dpure garbage\u201d) och exempel p\u00e5 hur man, utan att helt f\u00f6rst\u00e5 \u00e4mnet, kan f\u00e5 resultat som inte speglar verkligheten. Spinlock \u00e4r en l\u00e5g-niv\u00e5 primitiv som m\u00e5ste anv\u00e4ndas med stor f\u00f6rsiktighet i anv\u00e4ndarutrymmet och med full f\u00f6rst\u00e5else f\u00f6r detaljerna, annars kan man \u00e5stadkomma det som demonstrerades av testf\u00f6rfattaren. Linus r\u00e5dde spelutvecklare att inte anv\u00e4nda spinlock och inte f\u00f6rs\u00f6ka skapa egna l\u00e5sningssystem baserat p\u00e5 det, utan att anv\u00e4nda befintliga bepr\u00f6vade mekanismer som informerar systemet om v\u00e4ntan p\u00e5 att l\u00e5sningen ska frig\u00f6ras f\u00f6r att undvika planerarens p\u00e5verkan. <\/p>\n<p>Tillbyggnader baserade p\u00e5 Spinlock kan endast anv\u00e4ndas om man \u00e4r helt s\u00e4ker p\u00e5 att schemal\u00e4ggaren inte kommer att avbryta deras utf\u00f6rande. De l\u00e5sningar som anv\u00e4ndes i testerna baserade p\u00e5 spinlock \u00e4r implementerade genom en egen inpackning som arbetar i anv\u00e4ndarutrymmet. Schemal\u00e4ggaren kan n\u00e4r som helst ta \u00f6ver kontrollen under utf\u00f6randet av denna inpackning och v\u00e4xla till att utf\u00f6ra en annan uppgift. Eftersom m\u00e4tningen av prestanda baseras p\u00e5 absoluta v\u00e4rden fr\u00e5n tidtagaren omfattar vissa testf\u00f6rdr\u00f6jningar inte bara f\u00f6rdr\u00f6jningar i l\u00e5sbehandlaren, utan \u00e4ven kod som har utf\u00f6rts i en annan kontext, det vill s\u00e4ga de m\u00e4ter inte bara det som testf\u00f6rfattaren f\u00f6rs\u00f6kte m\u00e4ta, utan \u00e4ven \u201dbrus\u201d fr\u00e5n andra ber\u00e4kningar i systemet.<\/p>\n<p>Testf\u00f6rfattare <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189747\">f\u00f6rs\u00f6kte<\/a><\/noindex> att bem\u00f6ta Linus genom att p\u00e5peka att anv\u00e4ndningen av egna blockeringssystem baserade p\u00e5 spinlock ofta till\u00e4mpas i praktiken inom spel, eftersom tester visar h\u00f6gre prestanda med enklare schemal\u00e4ggare \u00e4n vad som anv\u00e4nds i Linux. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189752\">inv\u00e4nde<\/a><\/noindex>, att Linux-schemal\u00e4ggaren \u00e4r m\u00e5ngsidig, har slipats under \u00e5rtionden och optimerats inte bara f\u00f6r skrivbord och spel, utan \u00e4ven f\u00f6r andra typer av belastningar, s\u00e5som serversystem, vilket inneb\u00e4r att den tar h\u00e4nsyn till m\u00e5nga nyanser vid schemal\u00e4ggning av uppgifter. <\/p>\n<p>Att l\u00e4gga till specifika optimeringar som minskar latensen i Google Stadia-spel kan \u00f6ka responsen i det specifika fallet, men kommer antagligen att leda till en minskning av schemal\u00e4ggarens effektivitet som helhet. Till exempel fungerar Windows-schemal\u00e4ggaren b\u00e4ttre i de aktuella testen, eftersom den \u00e4r betydligt enklare \u00e4n Linux-schemal\u00e4ggaren och huvudsakligen \u00e4r optimerad f\u00f6r skrivbordsrelaterade uppgifter.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <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 5.0.4 - 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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