{"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\/en\/blog\/news\/systemd-journald-acknowledges-excessive-disk-load-problem-after-6-years","title":{"rendered":"In systemd-journald, the issue of excessive load on storage devices has been acknowledged after 6 years.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

The developers of the systemd project have begun investigating and addressing a long-standing architectural issue in the 'systemd-journald' component, which causes write amplification of disk data compared to the actual volume of logs. <\/p>\n

The story dates back to March 2020, when a report was filed in the bug tracking system demonstrating that generating about 500 KB of text logs resulted in over 700 MB of physical write operations on an SSD. At that time, the systemd developers staunchly refused to acknowledge the issue, responding with a statement like 'you don't understand how file systems work,' declined to conduct profiling, and closed the request with a verdict of 'not actionable.' The developers' comments received hundreds of negative ratings from users, but the project's position remained unyielding. <\/p>\n

In early 2026, a follow-up report on the issue was submitted, during which independent developer ValdikSS conducted detailed profiling using isolated cgroups and loop devices, clearly demonstrating the mechanism behind the problem: due to the use of memory-mapped files (mmap) and binary hash tables, writing even a single text message of 750 bytes results in modifications to memory fingerprints, causing a flush to disk of entire 4-kilobyte pages and generating 50 to 70 KB of total block device I\/O. <\/p>\n

After the report about the issue made it to the front page of Hacker News yesterday and the publication of irrefutable synthetic tests, the project's maintainers changed their rhetoric and began working on optimizing the cache flush mechanisms and the storage structure of journald indexes.
\n
Source: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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