{"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\/sv\/blog\/news\/systemd-journald-acknowledges-excessive-disk-load-problem-after-6-years","title":{"rendered":"Systemd-journald erk\u00e4nde efter 6 \u00e5r problemet med \u00f6verbelastning p\u00e5 lagringsenheter","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Utvecklarna av projektet systemd har p\u00e5b\u00f6rjat en granskning och \u00e5tg\u00e4rdande av ett l\u00e5ngvarigt arkitektoniskt problem i komponenten <systemd-journald>, som leder till en kraftig \u00f6kning av m\u00e4ngden data som skrivs till disk (write amplification) j\u00e4mf\u00f6rt med den faktiska m\u00e4ngden loggar. <\/p>\n

Historien g\u00e5r tillbaka till mars 2020, n\u00e4r en rapport registrerades i fels\u00f6kningssystemet som visade att genereringen av cirka 500 KB textloggar resulterade i mer \u00e4n 700 MB fysiska skrivoperationer p\u00e5 SSD. Utvecklarna av systemd v\u00e4grade d\u00e5 att erk\u00e4nna problemet, svarade med <ni f\u00f6rst\u00e5r inte hur filsystem fungerar>, avslog profilering och st\u00e4ngde \u00e4rendet med beslutet <not actionable>. Kommentarer fr\u00e5n utvecklarna samlade hundratals negativa omd\u00f6men fr\u00e5n anv\u00e4ndare, men projektets st\u00e5ndpunkt f\u00f6rblev orubblig. <\/p>\n

I b\u00f6rjan av 2026 skickades en ny rapport om problemet, under diskussionen genomf\u00f6rde den oberoende utvecklaren ValdikSS en detaljerad profilering med anv\u00e4ndning av isolerade cgroup och loop-enheter, vilket tydligt visade mekanismen bakom problemet: p\u00e5 grund av anv\u00e4ndningen av minnesmappade filer (mmap) och bin\u00e4ra hash-tabeller leder skrivning av \u00e4ven ett enda textmeddelande p\u00e5 750 byte till modifiering av minnesavtrycken, vilket orsakar en skrivning till disken av hela 4-kilobytes sidor och genererar mellan 50 och 70 KB slutlig in- och ut-data p\u00e5 blockenheten. <\/p>\n

Efter att problemet rapporterades p\u00e5 framsidan av Hacker News ig\u00e5r och publiceringen av oemots\u00e4gliga syntetiska tester, \u00e4ndrade projektets underh\u00e5llare sin retorik och p\u00e5b\u00f6rjade arbetet med att optimera cachens utl\u00e4mningsmekanismer och strukturen f\u00f6r lagring av index f\u00f6r journald.
\n
K\u00e4lla: 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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