Linux FAQ

[Hanzo]

При массовой работе с файлами ловил полные фризы системы. Например при чистке после компиляции joplin.

Ответ найден тут и тут

Редактируем или создаем файл /etc/sysctl.d/99-sysctl.conf со следующими данными:

Код:

vm.dirty_background_ratio = 5
vm.dirty_ratio = 10
vm.vfs_cache_pressure = 50

После этого подгружаем изменение командой:

Код:

sudo sysctl --system

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СпойлерNote: From version 207 and 21x, systemd only applies settings from /etc/sysctl.d/*.conf and /usr/lib/sysctl.d/*.conf. If you had customized /etc/sysctl.conf, you need to rename it as /etc/sysctl.d/99-sysctl.conf. If you had e.g. /etc/sysctl.d/foo, you need to rename it to /etc/sysctl.d/foo.conf.

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СпойлерVirtual memory

There are several key parameters to tune the operation of the virtual memory subsystem of the Linux kernel and the write out of dirty data to disk. See the official Linux kernel documentation for more information. For example:

vm.dirty_ratio = 10

Contains, as a percentage of total available memory that contains free pages and reclaimable pages, the number of pages at which a process which is generating disk writes will itself start writing out dirty data.

vm.dirty_background_ratio = 5

Contains, as a percentage of total available memory that contains free pages and reclaimable pages, the number of pages at which the background kernel flusher threads will start writing out dirty data.

As noted in the comments for the parameters, one needs to consider the total amount of RAM when setting these values. For example, simplifying by taking the installed system RAM instead of available memory:
Warning:

Higher ratio values may increase performance, it also increases the risk of data loss.
Setting this value to 0 may cause higher latency on disks and spikes.

See https://lonesysadmin.net/2013/12/22/bet ... rty_ratio/ for more information.

Consensus is that setting vm.dirty_ratio to 10% of RAM is a sane value if RAM is say 1 GB (so 10% is 100 MB). But if the machine has much more RAM, say 16 GB (10% is 1.6 GB), the percentage may be out of proportion as it becomes several seconds of writeback on spinning disks. A more sane value in this case may be 3 (3% of 16 GB is approximately 491 MB).
Similarly, setting vm.dirty_background_ratio to 5 may be just fine for small memory values, but again, consider and adjust accordingly for the amount of RAM on a particular system.