{"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\/ro\/blog\/news\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","title":{"rendered":"Discu\u021bia privind cre\u0219terea frecven\u021bei timerului \u00een kernelul Linux la 1000Hz \u00een mod implicit","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Un inginer de la Google a propus cre\u0219terea frecven\u021bei de generare a \u00eentreruperilor de la timer \u00een nucleul Linux la 1000Hz \u00een mod implicit, ceea ce va duce la o cre\u0219tere a frecven\u021bei de schimbare a sarcinilor \u0219i la reducerea cuantumului de timp \u00een planificatorul de sarcini. \u00cen prezent, se utilizeaz\u0103 implicit 250Hz, ca o form\u0103 de compromis \u00eentre performan\u021b\u0103, laten\u021b\u0103 \u0219i consumul de energie. <\/p>\n

Atunci c\u00e2nd se utilizeaz\u0103 display-uri cu o frecven\u021b\u0103 de refresh de 120Hz, tipice pentru PC-urile moderne \u0219i dispozitivele mobile, la o frecven\u021b\u0103 a timerului de 250Hz, inexactitatea cuantific\u0103rii timpului este de aproximativ jum\u0103tate din timpul cadru, ceea ce reduce eficien\u021ba distribu\u021biei resurselor \u0219i nu permite atingerea unei raport\u0103ri optime \u00eentre performan\u021b\u0103 \u0219i consumul de energie. Consumul de energie al sistemelor la o frecven\u021b\u0103 sc\u0103zut\u0103 a timerului poate fi mai mare, deoarece mecanismul DVFS (Dynamic Voltage and Frequency Scaling) utilizeaz\u0103 o strategie de selec\u021bie a frecven\u021bei mai agresiv\u0103 pentru a nu \u00eencetini executarea sarcinilor. <\/p>\n

Apar situa\u021bii \u00een care o sarcin\u0103 a finalizat deja opera\u021biile dorite, care necesitau calcule active, dar procesorul continu\u0103 s\u0103 func\u021bioneze la o frecven\u021b\u0103 crescut\u0103 din cauza limit\u0103rii cuantumului de timp, care nu a expirat \u00eenc\u0103. Cre\u0219terea frecven\u021bei de schimbare a sarcinilor poate duce la o reducere a consumului de energie datorit\u0103 eficien\u021bei sporite a gestion\u0103rii dinamice a frecven\u021bei (DVFS), unei distribuu\u021bii mai precise a intervalelor de timp de c\u0103tre planificatorul de sarcini, actualiz\u0103rii mai frecvente a statisticilor de utilizare a CPU-ului \u0219i reducerii timpului de a\u0219teptare al sarcinilor. <\/p>\n

Un alt inginer de la Google a propus men\u021binerea frecven\u021bei timerului a\u0219a cum este (250Hz), deoarece cre\u0219terea frecven\u021bei de generare a \u00eentreruperilor timerului ar putea duce la un consum crescut de energie pe dispozitivele cu putere redus\u0103, cum ar fi pl\u0103cile pentru internetul lucrurilor. Potrivit estim\u0103rilor sale, la o frecven\u021b\u0103 de 1000Hz, chiar \u0219i pe dispozitivele cu Android, s-a \u00eenregistrat \u00een unele situa\u021bii o cre\u0219tere a consumului de energie al procesorului de 7%. Odat\u0103 cu cre\u0219terea frecven\u021bei timerului, se observ\u0103, de asemenea, o trezire mai frecvent\u0103 a CPU-ului, deoarece la 250Hz, timerele setate pe intervalele t + 1 ms, t + 2 ms, t + 3 ms \u0219i t + 4 ms vor fi grupate \u0219i vor conduce la o singur\u0103 trezire, \u00een timp ce la 1000Hz vor avea loc patru treziri separate. <\/p>\n

Resursa Phoronix a realizat o compara\u021bie a performan\u021bei PC-urilor cu CPU AMD Ryzen 9 9950X. Configura\u021bia cu 1000Hz s-a dovedit a fi mai rapid\u0103 \u00een testele Llama.cpp, nginx, SuperTuxKart, Selenium \u0219i \u00een m\u0103surarea timpului de compilare a nucleului. \u00cen testele Darktable, PostgreSQL, Unvanquished, Xonotic, Blender, SVT-AV1, RawTherapee, performan\u021ba a fost mai bun\u0103 la 250Hz. La 1000Hz, consumul mediu de energie a fost de 144.2 W, minim 0.18 W, maxim 202.13 W, iar la 250Hz: mediu 144.37 W, minim 0.07 W, maxim 202 W.

\"Discu\u021bia<\/center>
\n
Sursa: opennet.ro<\/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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