3.2.3. Example Usage

Example 3.2. Limiting CPU access

The following examples assume you have an existing hierarchy of cgroups configured and the cpu subsystem mounted on your system:
  • To allow one cgroup to use 25% of a single CPU and a different cgroup to use 75% of that same CPU, use the following commands:
    ~]# echo 250 > /cgroup/cpu/blue/cpu.shares
    ~]# echo 750 > /cgroup/cpu/red/cpu.shares
  • To limit a cgroup to fully utilize a single CPU, use the following commands:
    ~]# echo 10000 > /cgroup/cpu/red/cpu.cfs_quota_us
    ~]# echo 10000 > /cgroup/cpu/red/cpu.cfs_period_us
  • To limit a cgroup to utilize 10% of a single CPU, use the following commands:
    ~]# echo 10000 > /cgroup/cpu/red/cpu.cfs_quota_us
    ~]# echo 100000 > /cgroup/cpu/red/cpu.cfs_period_us
  • On a multi-core system, to allow a cgroup to fully utilize two CPU cores, use the following commands:
    ~]# echo 200000 > /cgroup/cpu/red/cpu.cfs_quota_us
    ~]# echo 100000 > /cgroup/cpu/red/cpu.cfs_period_us