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Ci-dessous, les différences entre deux révisions de la page.

--- tech:limiter_les_ressources_cpu_pour_un_process_donne [2025/10/17 16:25] – Jean-Baptiste
+++ tech:limiter_les_ressources_cpu_pour_un_process_donne [2026/06/07 19:12] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon Ressources cgroups}}
+# Limiter les ressources CPU pour un process donne
+Restreindre l'usage de CPU
+How to limit CPU Usage of a process
+Voir :
+* https://wiki.archlinux.org/index.php/cgroups
+* https://linuxfr.org/users/zezinho/journaux/les-cgroups-un-outil-trop-meconnu
+* https://linuxhint.com/limit_cpu_usage_process_linux/
+~~~bash
+nice -n 19 COMMAND
+~~~
+ou
+~~~bash
+renice +19 1234
+#ionice -c3 -p 1234
+~~~
+Ou encode
+~~~bash
+systemd-run -p IOWeight=10 updatedb
+~~~
+Exemple
+~~~bash
+# best effort, highest priority
+sudo ionice -c2 -n0 -p `pgrep etcd`
+~~~
+~~~bash
+cgcreate -g cpu:/cpulimit
+cgset -r cpu.cfs_period_us=1000000 cpulimit
+cgset -r cpu.cfs_quota_us=100000 cpulimit
+~~~
+check
+~~~bash
+cgget -g cpu:cpulimit
+~~~
+~~~bash
+cgexec -g cpu:cpulimit COMMAND
+~~~
+ou
+~~~bash
+echo 1234 > /sys/fs/cgroup/cpu/cpulimit/tasks
+~~~
+ou
+~~~bash
+#cpulimit -p <PID> -l <%CPU>
+cpulimit -p 1234 -l 80
+~~~
+## Pb
+### write error: No space left on device
+Erreur
+~~~
+# echo 1234 > /sys/fs/cgroup/cpuset/cpulimit/tasks
+-bash: echo: write error: No space left on device
+~~~
+Solution
+~~~bash
+echo 0 > /sys/fs/cgroup/cpuset/cpulimit/cpuset.mems
+echo 0 > /sys/fs/cgroup/cpuset/cpulimit/cpuset.cpu
+~~~
+## How to limit a process to one CPU core in Linux - CPU affinity
+start a command with the given affinity
+~~~bash
+taskset -c 0 mycommand --option
+~~~
+set the affinity of a running process
+~~~bash
+taskset -c -pa 0 1234
+~~~