{"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\/fr\/blog\/news\/systemd-journald-acknowledges-excessive-disk-load-problem-after-6-years","title":{"rendered":"Dans systemd-journald, un probl\u00e8me de surcharges excessives sur les dispositifs de stockage a \u00e9t\u00e9 reconnu apr\u00e8s 6 ans","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Les d\u00e9veloppeurs du projet systemd ont commenc\u00e9 \u00e0 \u00e9tudier et \u00e0 r\u00e9soudre un ancien probl\u00e8me architectural dans le composant <systemd-journald>, qui entra\u00eene une amplification d'\u00e9criture, multipliant par plusieurs le volume des donn\u00e9es \u00e9crites sur disque par rapport au volume r\u00e9el des journaux. <\/p>\n

L'histoire remonte \u00e0 mars 2020, lorsqu'un rapport a \u00e9t\u00e9 enregistr\u00e9 dans le syst\u00e8me de suivi des erreurs, d\u00e9montrant qu'un g\u00e9n\u00e9rateur de journaux texte d'environ 500 Ko se traduit par plus de 700 Mo d'op\u00e9rations d'\u00e9criture physiques sur SSD. \u00c0 l'\u00e9poque, les d\u00e9veloppeurs de systemd avaient cat\u00e9goriquement refus\u00e9 de reconna\u00eetre le probl\u00e8me, r\u00e9pondant dans le style <\u00ab vous ne comprenez pas comment fonctionnent les syst\u00e8mes de fichiers \u00bb>, refusant de proc\u00e9der \u00e0 un profilage et fermant la demande avec le verdict <\u00ab not actionable \u00bb>. Les commentaires des d\u00e9veloppeurs ont recueilli des centaines de votes n\u00e9gatifs de la part des utilisateurs, mais la position du projet est rest\u00e9e inflexible. <\/p>\n

D\u00e9but 2026, un rapport sur le probl\u00e8me a \u00e9t\u00e9 soumis \u00e0 nouveau, durant la discussion, un d\u00e9veloppeur ind\u00e9pendant ValdikSS a r\u00e9alis\u00e9 un profilage d\u00e9taill\u00e9 en utilisant des cgroups isol\u00e9s et des dispositifs loop, prouvant clairement le m\u00e9canisme de survenance du probl\u00e8me : en raison de l'utilisation de fichiers mapp\u00e9s en m\u00e9moire (mmap) et de tables de hachage binaires, l'\u00e9criture m\u00eame d'un seul message texte de 750 octets entra\u00eene la modification des empreintes en m\u00e9moire, provoquant un d\u00e9versement sur disque de pages compl\u00e8tes de 4 Ko et g\u00e9n\u00e9rant entre 50 et 70 Ko de I\/O finale au niveau du dispositif de bloc. <\/p>\n

Apr\u00e8s que le rapport sur le probl\u00e8me ait atteint la page d'accueil de Hacker News hier et la publication de tests synth\u00e9tiques irr\u00e9futables, les mainteneurs du projet ont modifi\u00e9 leur rh\u00e9torique et ont commenc\u00e9 \u00e0 travailler sur l'optimisation des m\u00e9canismes de vidage de cache et de la structure de stockage des index journald.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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