{"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\/et\/blog\/novosti-interneta\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds l\u00fckkas \u00fcmber probleemi, mis tekkis \u00fclesannete planeerijaga, p\u00e4rast j\u00f5udlustesti.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

M\u00e4ngude arendaja Malte Skarupke avaldas<\/a><\/noindex> blokeeringute j\u00f5udluse v\u00f5rdlus p\u00f5hineb Mutex<\/a><\/noindex> ja Spinlock<\/a><\/noindex> erinevate \u00fclesandatu korraldajate kasutamisel. Testid n\u00e4itasid anomaalselt suuri viivitusi Spinlocki kasutamisel Linuxi vaikimisi \u00fclesande korraldajaga. Testide autor j\u00f5udis j\u00e4reldusele, et Linuxi \u00fclesande korraldaja omab probleeme, mis m\u00f5jutavad negatiivselt Google Stadia teenusele v\u00e4lja t\u00f6\u00f6tatud m\u00e4ngude t\u00f6\u00f6d, kus m\u00e4ngud t\u00f6\u00f6tavad GPU-l pilvekeskkonnas ja kliendile edastatakse ekraani sisu voogedastuse kaudu kuni 60 kaadrit sekundis. Sellistes tingimustes on oluline tagada kaadrite \u00f5igeaegne edastamine ekraanile ning \u00fcletavad millisekundi viivitused muutuvad m\u00e4rgatavaks.<\/p>\n

Testide arutelu \u00fchendatud<\/a><\/noindex> Linus Torvalds, who called them garbage (\u00abpure garbage\u00bb) and an example of how one can obtain performance metrics without fully understanding the subject. A spinlock is a low-level primitive that must be used very carefully in user space with a thorough understanding of the details; otherwise, one might encounter what the test author demonstrated. Linus advised game developers not to use spinlocks and not to attempt to create their own locking mechanisms based on it, but rather to use existing, proven mechanisms that inform the system about waiting for lock release to mitigate scheduler impact. <\/p>\n

Add-ons based on spinlocks can only be used with complete confidence that the scheduler will not interrupt their execution. The locks implemented in the tests based on spinlock are realized through a custom wrapper operating in user space. The task scheduler may take control at any random moment during the execution of this wrapper and switch to executing another task. Since performance measurement is based on absolute timer values, certain delays measured in the tests encompass not only delays in the lock handler but also code that was executed in another context, i.e., they measure not only what the test author aimed to measure, but also the \u00abnoise\u00bb from other computations in the system.<\/p>\n

Testi autor proovis<\/a><\/noindex> kavatseb Linusele vastata, m\u00e4rkides, et enda spinlocki p\u00f5histe lukustuss\u00fcsteemide rakendamine on sageli praktikas m\u00e4ngudes, kuna lihtsamate korraldajate kasutamisel kui Linuxis n\u00e4itavad testid k\u00f5rgemat j\u00f5udlust. Linus vastas<\/a><\/noindex>, et Linuxi korraldaja on universaalne, arendatud aastak\u00fcmneid ja optimeeritud mitte ainult lauaarvutite ja m\u00e4ngude jaoks, vaid ka muude koormuste, nagu serverite jaoks, arvesse v\u00f5ttes palju n\u00fcansse \u00fclesannete t\u00e4itmise planeerimisel. <\/p>\n

Spetsiifiliste optimeerimiste lisamine, mis v\u00f5imaldavad v\u00e4hendada viivitusi Google Stadia m\u00e4ngudes, v\u00f5ib parandada reageerimist konkreetsetes olukordades, kuid t\u00f5en\u00e4oliselt v\u00e4hendab see korraldaja efektiivsust \u00fcldiselt. N\u00e4iteks k\u00e4itub Windowsi korraldaja testides paremini, kuna see on palju lihtsam kui Linuxi korraldaja ja on peamiselt optimeeritud lauaarvutiga seotud \u00fclesannete jaoks.<\/p>\n

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

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

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