{"id":121915,"date":"2025-02-13T20:22:13","date_gmt":"2025-02-13T18:22:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu"},"modified":"2025-02-13T20:22:13","modified_gmt":"2025-02-13T18:22:13","slug":"obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","title":{"rendered":"Dyskusja na temat zwi\u0119kszenia domy\u015blnej cz\u0119stotliwo\u015bci timera w j\u0105drze Linux do 1000Hz","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In\u017cynier z firmy Google zaproponowa\u0142 zwi\u0119kszenie cz\u0119stotliwo\u015bci generowania przerwa\u0144 od timera w j\u0105drze Linux do 1000Hz domy\u015blnie, co doprowadzi do zwi\u0119kszenia cz\u0119stotliwo\u015bci prze\u0142\u0105czania zada\u0144 i skr\u00f3cenia kwantu czasu w harmonogramie zada\u0144. Obecnie domy\u015blnie stosuje si\u0119 250Hz jako pewien kompromis mi\u0119dzy wydajno\u015bci\u0105, op\u00f3\u017anieniami a zu\u017cyciem energii. <\/p>\n

Przy u\u017cyciu wy\u015bwietlaczy o cz\u0119stotliwo\u015bci od\u015bwie\u017cania 120Hz, typowych dla nowoczesnych komputer\u00f3w i urz\u0105dze\u0144 mobilnych, przy cz\u0119stotliwo\u015bci timera 250Hz, nieprecyzyjno\u015b\u0107 kwantowania czasu wynosi oko\u0142o po\u0142owy czasu klatki, co obni\u017ca efektywno\u015b\u0107 przydzia\u0142u zasob\u00f3w i uniemo\u017cliwia osi\u0105gni\u0119cie optymalnego stosunku wydajno\u015bci do zu\u017cycia energii. Zu\u017cycie energii przez systemy przy niskiej cz\u0119stotliwo\u015bci timera mo\u017ce by\u0107 wy\u017csze, poniewa\u017c mechanizm DVFS (Dynamic Voltage and Frequency Scaling) stosuje bardziej agresywn\u0105 strategi\u0119 wyboru cz\u0119stotliwo\u015bci, aby nie spowalnia\u0107 wykonywania zada\u0144. <\/p>\n

Wyst\u0119puj\u0105 sytuacje, gdy zadanie ju\u017c wykona\u0142o po\u017c\u0105dane operacje wymagaj\u0105ce aktywnych oblicze\u0144, ale procesor nadal dzia\u0142a z podwy\u017cszon\u0105 cz\u0119stotliwo\u015bci\u0105 z powodu sko\u0144czono\u015bci kwantu czasu, kt\u00f3ry jeszcze si\u0119 nie zako\u0144czy\u0142. Zwi\u0119kszenie cz\u0119stotliwo\u015bci prze\u0142\u0105czania zada\u0144 mo\u017ce prowadzi\u0107 do zmniejszenia zu\u017cycia energii dzi\u0119ki poprawie efektywno\u015bci dynamicznego zarz\u0105dzania cz\u0119stotliwo\u015bci\u0105 (DVFS), bardziej precyzyjnemu rozdzielaniu interwa\u0142\u00f3w przez harmonogram zada\u0144, cz\u0119stszemu aktualizowaniu statystyk obci\u0105\u017cenia CPU i skr\u00f3ceniu czasu oczekiwania zada\u0144. <\/p>\n

Inny in\u017cynier z Google zaproponowa\u0142 pozostawienie cz\u0119stotliwo\u015bci timera na poziomie 250Hz, poniewa\u017c zwi\u0119kszenie cz\u0119stotliwo\u015bci generowania przerwa\u0144 timera mo\u017ce prowadzi\u0107 do wy\u017cszego zu\u017cycia energii w urz\u0105dzeniach o niskiej mocy, takich jak p\u0142ytki do internetu rzeczy. Jego ocena wskazuje, \u017ce przy ustawieniu cz\u0119stotliwo\u015bci na 1000Hz nawet na urz\u0105dzeniach dzia\u0142aj\u0105cych na Androidzie w niekt\u00f3rych sytuacjach odnotowano wzrost zu\u017cycia energii przez procesor o 7%. Przy zwi\u0119kszonej cz\u0119stotliwo\u015bci timera zaobserwowano r\u00f3wnie\u017c cz\u0119stsze wybudzanie CPU, poniewa\u017c przy cz\u0119stotliwo\u015bci 250Hz timery ustawione na interwa\u0142y t + 1 ms, t + 2 ms, t + 3 ms i t + 4 ms b\u0119d\u0105 grupowane i prowadzi\u0142y do jednego wybudzenia, a w przypadku 1000Hz nast\u0105pi\u0105 cztery oddzielne wybudzenia. <\/p>\n

Portal Phoronix przeprowadzi\u0142 por\u00f3wnanie wydajno\u015bci komputer\u00f3w z procesorem AMD Ryzen 9 9950X. Konfiguracja z 1000Hz okaza\u0142a si\u0119 szybsza w testach Llama.cpp, nginx, SuperTuxKart, Selenium oraz podczas pomiaru czasu kompilacji j\u0105dra. W testach Darktable, PostgreSQL, Unvanquished, Xonotic, Blender, SVT-AV1, RawTherapee wydajno\u015b\u0107 by\u0142a wy\u017csza przy ustawieniu 250Hz. Przy 1000Hz \u015brednie zu\u017cycie energii wynios\u0142o 144,2 W, minimalne \u2014 0,18 W, maksymalne \u2014 202,13 W, a przy 250Hz: \u015brednie 144,37 W, minimalne 0,07 W, maksymalne \u2014 202 W.

\"Dyskusja<\/center>
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\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0447\u0430\u0441\u0442\u043e\u0442\u0443 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u043f\u0440\u0435\u0440\u044b\u0432\u0430\u043d\u0438\u0439 \u043e\u0442 \u0442\u0430\u0439\u043c\u0435\u0440\u0430 \u0432 \u044f\u0434\u0440\u0435 Linux \u0434\u043e 1000Hz \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e, \u0447\u0442\u043e \u043f\u0440\u0438\u0432\u0435\u0434\u0451\u0442 \u043a \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u044e \u0447\u0430\u0441\u0442\u043e\u0442\u044b \u043f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0437\u0430\u0434\u0430\u0447 \u0438 \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d\u0438\u044e \u043a\u0432\u0430\u043d\u0442\u0430 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0432 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