{"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\/pt\/blog\/news\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","title":{"rendered":"Discuss\u00e3o sobre o aumento da frequ\u00eancia do timer no n\u00facleo Linux para 1000Hz por padr\u00e3o","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Um engenheiro da Google sugeriu aumentar a frequ\u00eancia de gera\u00e7\u00e3o de interrup\u00e7\u00f5es do timer no n\u00facleo do Linux para 1000Hz por padr\u00e3o, o que resultar\u00e1 em um aumento da frequ\u00eancia de troca de tarefas e na redu\u00e7\u00e3o da dura\u00e7\u00e3o do quanta de tempo no escalonador de tarefas. Atualmente, a frequ\u00eancia padr\u00e3o \u00e9 de 250Hz, como um compromisso entre desempenho, lat\u00eancias e consumo de energia. <\/p>\n

Quando se utilizam displays com taxa de atualiza\u00e7\u00e3o de 120Hz, comuns em PCs e dispositivos m\u00f3veis modernos, uma frequ\u00eancia de timer de 250Hz resulta em uma inefic\u00e1cia de quantiza\u00e7\u00e3o de tempo de aproximadamente metade do tempo de um quadro, o que reduz a efici\u00eancia na distribui\u00e7\u00e3o de recursos e n\u00e3o permite alcan\u00e7ar a melhor rela\u00e7\u00e3o entre desempenho e consumo de energia. O consumo de energia dos sistemas com baixa frequ\u00eancia de timer pode ser maior, uma vez que o mecanismo DVFS (Dynamic Voltage and Frequency Scaling) utiliza uma estrat\u00e9gia mais agressiva para escolher a frequ\u00eancia, a fim de n\u00e3o atrasar a execu\u00e7\u00e3o das tarefas. <\/p>\n

Existem situa\u00e7\u00f5es em que uma tarefa j\u00e1 completou as opera\u00e7\u00f5es desejadas que exigiam c\u00e1lculos ativos, mas o processador continua operando em uma frequ\u00eancia elevada devido \u00e0 finitude do quanta de tempo que ainda n\u00e3o se esgotou. Aumentar a frequ\u00eancia de troca de tarefas pode levar a uma redu\u00e7\u00e3o no consumo de energia devido \u00e0 maior efici\u00eancia da gest\u00e3o din\u00e2mica de frequ\u00eancia (DVFS), \u00e0 distribui\u00e7\u00e3o mais precisa dos intervalos pelo escalonador de tarefas, \u00e0 atualiza\u00e7\u00e3o mais frequente das estat\u00edsticas de carga do CPU e \u00e0 diminui\u00e7\u00e3o do tempo que as tarefas ficam em estado de espera. <\/p>\n

Outro engenheiro da Google sugeriu manter a frequ\u00eancia do timer como est\u00e1 (250Hz), pois aumentar a frequ\u00eancia de gera\u00e7\u00e3o de interrup\u00e7\u00f5es do timer pode resultar em aumento do consumo de energia em dispositivos de baixa pot\u00eancia, como placas para Internet das Coisas. De acordo com sua avalia\u00e7\u00e3o, ao definir a frequ\u00eancia em 1000Hz, mesmo em dispositivos Android, foram observados aumentos no consumo de energia do processador em at\u00e9 7% em algumas situa\u00e7\u00f5es. Com o aumento da frequ\u00eancia do timer, tamb\u00e9m \u00e9 not\u00e1vel um despertar mais frequente do CPU, pois a 250Hz, timers configurados para intervalos t + 1 ms, t + 2 ms, t + 3 ms e t + 4 ms ser\u00e3o agrupados e resultar\u00e3o em um \u00fanico despertar, enquanto a 1000Hz haver\u00e1 quatro despertares separados. <\/p>\n

O recurso Phoronix realizou uma compara\u00e7\u00e3o de desempenho de PCs com processadores AMD Ryzen 9 9950X. A configura\u00e7\u00e3o com 1000Hz mostrou-se mais r\u00e1pida nos testes de Llama.cpp, nginx, SuperTuxKart, Selenium e na medi\u00e7\u00e3o do tempo de compila\u00e7\u00e3o do kernel. Nos testes de Darktable, PostgreSQL, Unvanquished, Xonotic, Blender, SVT-AV1 e RawTherapee, o desempenho foi melhor com a configura\u00e7\u00e3o de 250Hz. Com 1000Hz, o consumo m\u00e9dio de energia foi de 144,2 W, o m\u00ednimo \u2014 0,18 W, e o m\u00e1ximo \u2014 202,13 W; enquanto que com 250Hz: o m\u00e9dio foi de 144,37 W, o m\u00ednimo de 0,07 W e o m\u00e1ximo \u2014 202 W.

\"Discuss\u00e3o<\/center>
\n
Fonte: 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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