Setting absolute limits on CPU for Docker containers
I believe I've gotten this working. I had to restart my Docker daemon with --exec-driver=lxc as Icould not find a way to pass cgroup arguments to libcontainer. This approach worked for me:
# Run with absolute limitsudo docker run --lxc-conf="lxc.cgroup.cpu.cfs_quota_us=50000" -it ubuntu bashThe necessary CFS docs on bandwidth limiting are here.
I briefly confirmed with sysbench that this does seem to introduce an absolute limit, as shown below:
$ sudo docker run --lxc-conf="lxc.cgroup.cpu.cfs_quota_us=10000" --lxc-conf="lxc.cgroup.cpu.cfs_period_us=50000" -it ubuntu bashroot@302e651c0686:/# sysbench --test=cpu --num-threads=1 run <snip> total time: 90.5450s$ sudo docker run --lxc-conf="lxc.cgroup.cpu.cfs_quota_us=20000" --lxc-conf="lxc.cgroup.cpu.cfs_period_us=50000" -it ubuntu bashroot@302e651c0686:/# sysbench --test=cpu --num-threads=1 run <snip> total time: 45.0423s