cgroups
cgroups
- what are cgroups: A control group is a linux mechanism for grouping processes so that their hardware resource (cpu time, memory, IO, etc) can be measured and controlled collectively. Eg put a program and its child processes in a cgroup and limit their combined CPU usage to 2 cores, or memory usage to 1GB, etc.
- How to create cgroups:
sudo mkdir /sys/fs/cgroup/<name>. - How to create temporary cgroup:
systemd-run --user --unit=banana --scope -p CPUQuota=200% -p MemoryMax=2G -- ./a.out - How to run a process in a specific cgroup:
bash -c 'echo $$ | sudo tee /sys/fs/cgroup/<cgroup_name>/cgroup.procs >/dev/null && exec ./a.out arg1 arg2' - How to check statistics of the cgroup:
cat /sys/fs/cgroup/<name>/cpu.stat - Given a process, how to tell its cgroup:
cat /proc/<pid>/cgroup - How to kill all process in a cgroup:
echo 1 | sudo tee /sys/fs/cgroup/<name>/cgroup.kill - pid in a cgroup:
cat /sys/fs/cgroup/banana/cgroup.procs
