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| author | Einsler Lee <shenxiaogll@163.com> | 2021-01-30 11:14:35 +0800 |
|---|---|---|
| committer | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2021-01-30 12:48:15 +0100 |
| commit | 9c587d66187976de49e2d2028cebe1aef5b77b9c (patch) | |
| tree | a372269f77612c31d4c707c8581bb1381ff9d9ee /man/systemd-system.conf.xml | |
| parent | 7a1fed85d7b84cfc9c494d5fd62cf7024046aec9 (diff) | |
| download | systemd-9c587d66187976de49e2d2028cebe1aef5b77b9c.tar.gz | |
man: make it clear how systemd calculate the DefaultTasksMax.
Actually, systemd takes the minimum of
* a) the maximum tasks value the kernel allows on this architecture
* b) the cgroups pids_max attribute for the system
* c) the kernel's configured maximum PID value
to calculate the DefaultTasksMax. Here, kernel.thread-max should also be methioned.
Diffstat (limited to 'man/systemd-system.conf.xml')
| -rw-r--r-- | man/systemd-system.conf.xml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/man/systemd-system.conf.xml b/man/systemd-system.conf.xml index 0dea50f2fe..075666ac6b 100644 --- a/man/systemd-system.conf.xml +++ b/man/systemd-system.conf.xml @@ -361,7 +361,8 @@ <listitem><para>Configure the default value for the per-unit <varname>TasksMax=</varname> setting. See <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details. This setting applies to all unit types that support resource control settings, with the exception - of slice units. Defaults to 15% of the sysctl setting <varname>kernel.pid_max=</varname> or root cgroup <varname>pids.max</varname>. + of slice units. Defaults to 15% of the minimum of <varname>kernel.pid_max=</varname>, <varname>kernel.threads-max=</varname> + and root cgroup <varname>pids.max</varname>. Kernel has a default value for <varname>kernel.pid_max=</varname> and an algorithm of counting in case of more than 32 cores. For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 4915, but might be greater in other systems or smaller in OS containers.</para></listitem> |