{"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\/news\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds l\u00fckkas \u00fcmber probleemid \u00fclessaanide planeerijaga, mis t\u00f5usid esile j\u00f5udluse testis.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

M\u00e4ngude arendaja Malte Skarupke avalikustas<\/a><\/noindex> blokeeringute j\u00f5udluse v\u00f5rdluse p\u00f5hjal Mutex<\/a><\/noindex> ja Spinlock<\/a><\/noindex> erinevate \u00fclessaanide planeerijate kasutamisel. Testid n\u00e4itasid anomaalselt suurenenud viivitusi Spinlocki kasutamisel Linuxi vaikimisi \u00fclessaanide planeerijaga. Testide autor j\u00f5udis j\u00e4reldusele, et Linuxi \u00fclessaanide planeerijal on probleemid, mis m\u00f5jutavad negatiivselt Google Stadia teenuse jaoks loodud m\u00e4ngude t\u00f6\u00f6d, kus m\u00e4ngud toimuvad GPU-l pilves ja kliendile edastatakse ekraanisisu voogedastuse kaudu kuni 60 kaadrit sekundis. N\u00f5udlike tingimuste t\u00f5ttu on oluline tagada kaadrile \u00f5igeaegne edastamine ning viivitused, mis \u00fcletavad millisekundi, muutuvad m\u00e4rgatavaks.<\/p>\n

Testide arutelule liitus<\/a><\/noindex> Linus Torvalds, who referred to them as garbage (\"pure garbage\") and an example of how one can, without fully understanding the subject, achieve metrics that do not reflect reality. A spinlock is a low-level primitive that must be used with great caution in user space and a full understanding of the details, otherwise, one might end up with what the test author demonstrated. Linus advised game developers not to use spinlocks and not to attempt to create their own locking systems based on it, but to utilize existing proven mechanisms that inform the system about waiting for lock release to exclude the scheduler's impact. <\/p>\n

Add-ons based on spinlocks can only be used when there is complete confidence that the scheduler will not interrupt their execution. The locks used in the tests based on spinlocks are implemented through a homemade wrapper operating in user space. The task scheduler can randomly take control at any moment during the execution of this wrapper and switch to executing another task. Since performance measurement is based on absolute timer values, the delays specified in the tests cover not only delays in the lock handler but also code that was executed in another context, meaning they measure not only what the test author intended to measure but also the \"noise\" from other computations in the system.<\/p>\n

Testi autor \u00fcritas<\/a><\/noindex> vaidlema Linusele, osutades sellele, et kohandatud spinlock-p\u00f5histe lukustusmehhanismide kasutamine on praktikas tihti levinud, kuna lihtsamatel planeerijatel, kui Linuxis, n\u00e4itavad testid k\u00f5rgemat j\u00f5udlust. Linus vastas<\/a><\/noindex>, et Linuxi planeerija on universaalne, perfektsioneeritud aastak\u00fcmnete jooksul ja optimeeritud mitte ainult t\u00f6\u00f6lauaks ja m\u00e4ngudeks, vaid ka teiste koormuste jaoks, n\u00e4iteks serveri s\u00fcsteemide jaoks, seega arvestab see \u00fclesannete t\u00e4itmise planeerimisel paljude n\u00fcanssidega. <\/p>\n

Spetsiifiliste optimeerimiste lisamine, mis aitavad v\u00e4hendada viivitusi Google Stadia m\u00e4ngudes, v\u00f5ib konkreetses olukorras parandada reageerimisv\u00f5imet, kuid t\u00f5en\u00e4oliselt v\u00e4hendab see planeerija t\u00f5husust kogu tervikuna. N\u00e4iteks toimib Windowsi planeerija arutatud testides paremini, kuna see on oluliselt lihtsam kui Linuxi planeerija ja on peamiselt optimeeritud t\u00f6\u00f6laudadele spetsiifilistele \u00fclesannetele.<\/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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