{"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\/cs\/blog\/news\/systemd-journald-acknowledges-excessive-disk-load-problem-after-6-years","title":{"rendered":"V systemd-journald po 6 letech uznali probl\u00e9m nadm\u011brn\u00e9ho zat\u00ed\u017een\u00ed \u00falo\u017ei\u0161\u0165.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdvoj\u00e1\u0159i projektu systemd za\u010dali zkoumat a \u0159e\u0161it d\u00e1vnou architektonickou chybu v komponent\u011b \u201esystemd-journald\u201c, kter\u00e1 zp\u016fsobuje v\u00edce ne\u017e trojn\u00e1sobn\u00e9 zv\u00fd\u0161en\u00ed objemu dat zapisovan\u00fdch na disk (write amplification) ve srovn\u00e1n\u00ed se skute\u010dn\u00fdm objemem log\u016f. <\/p>\n

P\u0159\u00edb\u011bh trv\u00e1 od b\u0159ezna 2020, kdy byl v syst\u00e9mu sledov\u00e1n\u00ed chyb zaregistrov\u00e1n report, kter\u00fd uk\u00e1zal, \u017ee generov\u00e1n\u00ed p\u0159ibli\u017en\u011b 500 KB textov\u00fdch log\u016f se prom\u011bn\u00ed ve v\u00edce ne\u017e 700 MB fyzick\u00fdch z\u00e1pisov\u00fdch operac\u00ed na SSD. V\u00fdvoj\u00e1\u0159i systemd tehdy kardin\u00e1ln\u011b odm\u00edtli uznat probl\u00e9m, odpov\u011bd\u011bli ve stylu \u201enech\u00e1pete, jak funguj\u00ed souborov\u00e9 syst\u00e9my\u201c, odm\u00edtli prov\u00e9st profilov\u00e1n\u00ed a uzav\u0159eli \u017e\u00e1dost s verdiktem \u201enot actionable\u201c. Koment\u00e1\u0159e v\u00fdvoj\u00e1\u0159\u016f z\u00edskaly stovky negativn\u00edch hodnocen\u00ed od u\u017eivatel\u016f, nicm\u00e9n\u011b postoj projektu z\u016fstal neochv\u011bjn\u00fd. <\/p>\n

Na za\u010d\u00e1tku roku 2026 byla zasl\u00e1na opakovan\u00e1 zpr\u00e1va o probl\u00e9mu, b\u011bhem kter\u00e9 nez\u00e1visl\u00fd v\u00fdvoj\u00e1\u0159 ValdikSS provedl podrobnou profilaci s vyu\u017eit\u00edm izolovan\u00fdch cgroup a loop za\u0159\u00edzen\u00ed, co\u017e n\u00e1zorn\u011b prok\u00e1zalo mechanismus vzniku probl\u00e9mu: d\u00edky pou\u017eit\u00ed zrcadlen\u00fdch pam\u011b\u0165ov\u00fdch soubor\u016f (mmap) a bin\u00e1rn\u00edch hashovac\u00edch tabulek zp\u016fsob\u00ed z\u00e1pis i jedn\u00e9 textov\u00e9 zpr\u00e1vy o velikosti 750 byt\u016f \u00fapravu otisk\u016f v pam\u011bti, co\u017e vyvol\u00e1 z\u00e1pis na disk cel\u00fdch 4kilobajtov\u00fdch str\u00e1nek a generaci od 50 do 70 KB kone\u010dn\u00e9ho vstupu\/v\u00fdstupu na \u00farovni blokov\u00e9ho za\u0159\u00edzen\u00ed. <\/p>\n

Po v\u010derej\u0161\u00edm zve\u0159ejn\u011bn\u00ed zpr\u00e1vy o probl\u00e9mu na hlavn\u00ed str\u00e1nce Hacker News a publikaci nezvratn\u00fdch syntetick\u00fdch test\u016f zm\u011bnili spr\u00e1vci projektu r\u00e9toriku a za\u010dali pracovat na optimalizaci mechanism\u016f v\u00fdpisu cache a struktury ukl\u00e1d\u00e1n\u00ed index\u016f journald.
\n
Zdroj: 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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