{"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\/da\/blog\/news\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds har afvist problemer med opgaveplanl\u00e6ggeren, der blev rejst under en ydeevnetest","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spiludvikler Malte Skarupke udgav<\/a><\/noindex> sammenligning af pr\u00e6stationen af l\u00e5se baseret p\u00e5 Mutex<\/a><\/noindex> og Spinlock<\/a><\/noindex> ved brug af forskellige opgaveplanl\u00e6ggere. Testene viste abnormt store forsinkelser ved brug af Spinlock med den standardopgaveplanl\u00e6gger, der anvendes i Linux. Testens forfatter konkluderede, at Linux-opgaveplanl\u00e6ggeren har problemer, der negativt p\u00e5virker spil, der er udviklet til Google Stadia-service, hvor spil k\u00f8res p\u00e5 GPU i et cloud-milj\u00f8, og klienten kun modtager en streamet overf\u00f8rsel af sk\u00e6rminhold med op til 60 billeder pr. sekund. Under s\u00e5danne omst\u00e6ndigheder er det n\u00f8dvendigt at sikre en rettidig fremvisning af billeder p\u00e5 sk\u00e6rmen, og forsinkelser, der overstiger et millisekund, bliver m\u00e6rkbare.<\/p>\n

Til diskussion af testene blev tilsluttet<\/a><\/noindex> Linus Torvalds, der kaldte dem skrald (\"pure garbage\") og et eksempel p\u00e5, hvordan man kan f\u00e5 resultater uden at forst\u00e5 emnet fuldt ud, hvilket ikke afspejler den reelle virkelighed. Spinlock er en lavniveau-primitiv, som i brugeromr\u00e5det skal anvendes med stor forsigtighed og med fuld forst\u00e5else for detaljerne; ellers kan man f\u00e5 det, der blev demonstreret af testens forfatter. Linus r\u00e5dede spiludviklere til ikke at bruge spinlock og ikke at fors\u00f8ge at opbygge deres egne l\u00e5sesystemer baseret p\u00e5 det, men i stedet bruge eksisterende, p\u00e5lidelige mekanismer, der informerer systemet om at vente p\u00e5 frigivelsen af l\u00e5sen for at udelukke indflydelsen fra scheduler. <\/p>\n

Overbygninger baseret p\u00e5 Spinlock kan kun bruges, n\u00e5r man er helt sikker p\u00e5, at scheduler ikke vil afbryde deres udf\u00f8relse. De l\u00e5se, der anvendes i testene, baseret p\u00e5 spinlock, er implementeret gennem en hjemmestrikket wrapper, der k\u00f8rer i brugeromr\u00e5det. Opgaveplanen kan n\u00e5r som helst tage kontrollen under udf\u00f8relsen af denne wrapper og skifte til at udf\u00f8re en anden opgave. Da m\u00e5lingen af ydeevnen udf\u00f8res baseret p\u00e5 absolutte timer, d\u00e6kker de bestemte forsinkelser i testene ikke kun forsinkelserne i l\u00e5sehandleren, men ogs\u00e5 den kode, der blev udf\u00f8rt i en anden kontekst; det vil sige, at de m\u00e5ler ikke kun det, som testens forfatter fors\u00f8gte at m\u00e5le, men ogs\u00e5 \"st\u00f8j\" fra andre beregninger i systemet.<\/p>\n

Testens forfatter fors\u00f8gte<\/a><\/noindex> at an argument with Linus by pointing out that the use of proprietary blocking systems based on spinlock is often employed in practice within games, as tests show higher performance when using simpler schedulers than in Linux. Linus argued<\/a><\/noindex>, that the Linux scheduler is universal, refined over decades and optimized not only for desktops and games but also for various other types of loads, such as server systems, thus accounting for numerous nuances in task execution planning. <\/p>\n

Adding specific optimizations that can reduce latency in Google Stadia games might improve responsiveness in certain cases, but it will most likely lead to a decrease in overall scheduler efficiency. For instance, the Windows scheduler performs better in the discussed tests as it is significantly simpler than the Linux scheduler and mainly optimized for desktop-specific tasks.<\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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, 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