{"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\/ro\/blog\/news\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds a negat problemele cu planificatorul de sarcini, care au ap\u0103rut \u00een testul de performan\u021b\u0103.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dezvoltator de jocuri Malte Skarupke a publicat<\/a><\/noindex> compararea performan\u021bei blocajelor bazate pe Mutex<\/a><\/noindex> \u0219i Spinlock<\/a><\/noindex> folosind diferi\u021bi programatori de sarcini. Testele au ar\u0103tat \u00eent\u00e2rzieri anormal de mari la utilizarea Spinlock cu programatorul de sarcini folosit \u00een mod prestabilit \u00een Linux. Autorul testelor a concluzionat c\u0103 programatorul de sarcini Linux are probleme care afecteaz\u0103 negativ performan\u021ba jocurilor create pentru serviciul Google Stadia, \u00een care jocurile ruleaz\u0103 pe GPU \u00eentr-un mediu cloud, iar clientul prime\u0219te doar con\u021binutul ecranului \u00een flux, cu o frecven\u021b\u0103 de p\u00e2n\u0103 la 60 de cadre pe secund\u0103. \u00cen astfel de condi\u021bii, este necesar s\u0103 se asigure o redare la timp a cadrelor pe ecran, \u00eent\u00e2rzierea dep\u0103\u0219ind o milisecund\u0103 devine vizibil\u0103.<\/p>\n

La discu\u021bia testelor s-a al\u0103turat<\/a><\/noindex> Linus Torvalds, who called them garbage («pure garbage») and an example of how one can, without fully understanding the topic, obtain metrics that do not reflect reality. A spinlock is a low-level primitive that should be used in user space with great caution and a complete understanding of the details; otherwise, you may get what was demonstrated by the author of the test. Linus advised game developers not to use spinlocks and not to attempt to create their own locking systems based on it, but to use existing proven mechanisms that inform the system about waiting for the lock to be released to exclude the influence of the scheduler. <\/p>\n

Spinlock-based extensions can only be used with complete confidence that the scheduler will not interrupt their execution. The locks tested based on spinlocks are implemented through a homemade wrapper that operates in user space. The task scheduler can randomly take control at any moment during the execution of this wrapper and switch to performing another task. Since performance measurement is based on absolute timer values, the delays defined in the tests cover not only the delays in the lock handler but also the code that was executed in another context, i.e., they measure not only what the author of the test attempted to measure but also the «noise» from other computations in the system.<\/p>\n

Autorul testului a \u00eencercat<\/a><\/noindex> a contrazice pe Linus, ar\u0103t\u00e2nd c\u0103 utilizarea propriilor sisteme de blocare bazate pe spinlock este frecvent utilizat\u0103 \u00een practic\u0103 \u00een jocuri, deoarece teste efectuate cu planificatoare mai simple dec\u00e2t cele din Linux arat\u0103 o performan\u021b\u0103 mai mare. Linus a contrazis<\/a><\/noindex>, c\u0103 planificatorul Linux este universal, rafinat de-a lungul decadelor \u0219i optimizat nu doar pentru desktop \u0219i jocuri, ci \u0219i pentru alte tipuri de sarcini, de exemplu, pentru sisteme server, deci ia \u00een considerare numeroase detalii \u00een planificarea execu\u021biei sarcinilor. <\/p>\n

Ad\u0103ugarea de optimiz\u0103ri specifice care permit reducerea laten\u021bei \u00een jocurile Google Stadia poate cre\u0219te reactivitatea \u00een anumite cazuri, dar cel mai probabil va duce la o sc\u0103dere a eficien\u021bei planificatorului \u00een ansamblu. De exemplu, planificatorul Windows se comport\u0103 mai bine \u00een teste discutate, deoarece este semnificativ mai simplu dec\u00e2t planificatorul Linux \u0219i optimizat \u00een principal pentru sarcini specifice desktop-ului.<\/p>\n

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

Sursa: opennet.ro<\/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 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