{"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\/hu\/blog\/news\/systemd-journald-acknowledges-excessive-disk-load-problem-after-6-years","title":{"rendered":"A systemd-journaldban 6 \u00e9v ut\u00e1n elismert\u00e9k a t\u00e1rol\u00f3k t\u00falterhel\u00e9s\u00e9nek probl\u00e9m\u00e1j\u00e1t","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A projekt systemd fejleszt\u0151i elkezdt\u00e9k tanulm\u00e1nyozni \u00e9s orvosolni a \"systemd-journald\" komponens\u00e9ben l\u00e9v\u0151 r\u00e9g\u00f3ta fenn\u00e1ll\u00f3 architektur\u00e1lis probl\u00e9m\u00e1t, amely a lemezen r\u00f6gz\u00edtend\u0151 adatok (\u00edr\u00e1si amplifik\u00e1ci\u00f3) mennyis\u00e9g\u00e9t t\u00f6bbsz\u00f6r\u00f6s\u00e9re n\u00f6veli a t\u00e9nyleges napl\u00f3m\u00e9rethez k\u00e9pest. <\/p>\n

A t\u00f6rt\u00e9net 2020 m\u00e1rcius\u00e1ig ny\u00falik vissza, amikor egy hibafigyel\u0151 rendszerben egy jelent\u00e9s k\u00e9sz\u00fclt, amely bemutatta, hogy k\u00f6r\u00fclbel\u00fcl 500 KB sz\u00f6veges napl\u00f3 gener\u00e1l\u00e1sa t\u00f6bb mint 700 MB fizikai \u00edr\u00e1si m\u0171veletet jelent az SSD-n. A systemd fejleszt\u0151i ekkor hat\u00e1rozottan elutas\u00edtott\u00e1k a probl\u00e9ma elismer\u00e9s\u00e9t, \u00fagy v\u00e1laszoltak, hogy \"nem \u00e9rtik, hogyan m\u0171k\u00f6dnek a f\u00e1jlrendszerek\", el\u00e1lltak a profiloz\u00e1st\u00f3l \u00e9s az ig\u00e9nyt \"not actionable\" \u00edt\u00e9lettel z\u00e1rt\u00e1k le. A fejleszt\u0151k kommentjei sz\u00e1mos negat\u00edv \u00e9rt\u00e9kel\u00e9st gy\u0171jt\u00f6ttek \u00f6ssze a felhaszn\u00e1l\u00f3kt\u00f3l, azonban a projekt \u00e1ll\u00e1spontja hat\u00e1rozott maradt. <\/p>\n

2026 elej\u00e9n \u00fajb\u00f3l jelent\u00e9st k\u00fcldtek a probl\u00e9m\u00e1r\u00f3l, amelynek sor\u00e1n egy f\u00fcggetlen fejleszt\u0151, ValdikSS r\u00e9szletes profiloz\u00e1st v\u00e9gzett izol\u00e1lt cgroupok \u00e9s loop-eszk\u00f6z\u00f6k haszn\u00e1lat\u00e1val, vil\u00e1gosan bizony\u00edtva a probl\u00e9ma keletkez\u00e9s\u00e9nek mechanizmus\u00e1t: a mem\u00f3ri\u00e1ba lek\u00e9pezett f\u00e1jlok (mmap) \u00e9s bin\u00e1ris hash-t\u00e1bl\u00e1k haszn\u00e1lata miatt egyetlen 750 b\u00e1jtos sz\u00f6veges \u00fczenet \u00edr\u00e1sa is a mem\u00f3ri\u00e1ban l\u00e9v\u0151 nyomtatv\u00e1nyok m\u00f3dos\u00edt\u00e1s\u00e1hoz vezet, ami a teljes 4 kilob\u00e1jtos oldalak lemezre t\u00f6rt\u00e9n\u0151 \u00edr\u00e1s\u00e1t \u00e9s 50-70 KB v\u00e9gs\u0151 bemeneti\/kimeneti (I\/O) gener\u00e1l\u00e1s\u00e1t okozza blokk eszk\u00f6z szinten. <\/p>\n

Miut\u00e1n a tegnapi probl\u00e9majelent\u00e9s megjelent a Hacker News f\u0151oldal\u00e1n, \u00e9s k\u00f6zz\u00e9tett\u00e9k a megc\u00e1folhatatlan szintetikus teszteket, a projekt karbantart\u00f3i megv\u00e1ltoztatt\u00e1k a retorik\u00e1jukat, \u00e9s elkezdtek dolgozni a cache-ki\u00fcr\u00edt\u00e9si mechanizmusok \u00e9s a journald indexek t\u00e1rol\u00e1si strukt\u00far\u00e1j\u00e1nak optimaliz\u00e1l\u00e1s\u00e1n.
\n
Forr\u00e1s: 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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