{"id":183001,"date":"2026-08-15T10:53:29","date_gmt":"2026-08-15T08:53:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/v-systemd-journald-spustya-6-let-priznali-problemu-izbytochnoj-nagruzki-na-nakopiteli"},"modified":"2026-08-15T10:53:32","modified_gmt":"2026-08-15T08:53:32","slug":"systemd-journald-acknowledges-excessive-disk-load-problem-after-6-years","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/systemd-journald-acknowledges-excessive-disk-load-problem-after-6-years","title":{"rendered":"No systemd-journald, ap\u00f3s 6 anos, reconheceram o problema do excesso de carga nos dispositivos de armazenamento.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Os desenvolvedores do projeto systemd come\u00e7aram a investigar e resolver um antigo problema arquitet\u00f4nico no componente systemd-journald<\/span>, que leva a uma amplia\u00e7\u00e3o excessiva dos dados gravados no disco (write amplification) em compara\u00e7\u00e3o com o volume real dos logs. <\/p>\n

A hist\u00f3ria remonta a mar\u00e7o de 2020, quando um relat\u00f3rio foi registrado no sistema de rastreamento de erros, demonstrando que a gera\u00e7\u00e3o de cerca de 500 KB de logs de texto resultava em mais de 700 MB de opera\u00e7\u00f5es f\u00edsicas de grava\u00e7\u00e3o em SSD. Naquela \u00e9poca, os desenvolvedores do systemd se recusaram totalmente a reconhecer o problema, responderam com a ideia de que 'voc\u00eas n\u00e3o entendem como funcionam os sistemas de arquivos', rejeitaram a realiza\u00e7\u00e3o de perfis e fecharam o pedido com o veredicto 'not actionable'. Os coment\u00e1rios dos desenvolvedores receberam centenas de avalia\u00e7\u00f5es negativas dos usu\u00e1rios, mas a posi\u00e7\u00e3o do projeto permaneceu inabal\u00e1vel. <\/p>\n

No in\u00edcio de 2026, um novo relat\u00f3rio sobre o problema foi enviado, e durante a discuss\u00e3o, o desenvolvedor independente ValdikSS realizou uma profila\u00e7\u00e3o detalhada utilizando cgroups isoladas e dispositivos loop, demonstrando claramente o mecanismo da exist\u00eancia do problema: devido ao uso de arquivos mapeados na mem\u00f3ria (mmap) e tabelas hash bin\u00e1rias, a grava\u00e7\u00e3o de uma \u00fanica mensagem de texto de 750 bytes leva \u00e0 modifica\u00e7\u00e3o de impress\u00f5es na mem\u00f3ria, causando o descarregamento no disco de p\u00e1ginas completas de 4 kilobytes e gerando de 50 a 70 KB de entrada\/sa\u00edda final no n\u00edvel do dispositivo de bloco. <\/p>\n

Depois que o relat\u00f3rio sobre o problema apareceu na p\u00e1gina inicial do Hacker News e a publica\u00e7\u00e3o de testes sint\u00e9ticos irrefut\u00e1veis, os mantenedores do projeto mudaram sua ret\u00f3rica e come\u00e7aram a trabalhar na otimiza\u00e7\u00e3o dos mecanismos de descarregamento de cache e na estrutura de armazenamento dos \u00edndices do journald.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 systemd \u043f\u0440\u0438\u0441\u0442\u0443\u043f\u0438\u043b\u0438 \u043a \u0438\u0437\u0443\u0447\u0435\u043d\u0438\u044e \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e \u0434\u0430\u0432\u043d\u0435\u0439 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043d\u043e\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0435 «systemd-journald», \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0435\u0439 \u043a \u043c\u043d\u043e\u0433\u043e\u043a\u0440\u0430\u0442\u043d\u043e\u043c\u0443 \u0437\u0430\u0432\u044b\u0448\u0435\u043d\u0438\u044e \u043e\u0431\u044a\u0451\u043c\u0430 \u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u043c\u044b\u0445 \u043d\u0430 \u0434\u0438\u0441\u043a \u0434\u0430\u043d\u043d\u044b\u0445 (write amplification) \u043f\u043e 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