cpu_cgroup_calc

A small Python utility for Linux cpu cgroup controller:

Compute cgroup cpu.shares values from a list of CPU %, and the reverse.

Usage

$ ./cpu_cgroup_calc.py
usage: cpu_cgroup_calc.py [-h] [-p2s percent [percent ...] | -s2p share
                          [share ...]]

Compute cgroup cpu.shares values from a list of CPU %, and the reverse.

optional arguments:
  -h, --help            show this help message and exit
  -p2s percent [percent ...], --percent_to_share percent [percent ...]
                        from CPU % to cpu.shares
  -s2p share [share ...], --share_to_percent share [share ...]
                        from cpu.shares to CPU %

Sample outputs

$ ./cpu_cgroup_calc.py -p2s 50 30 15 5
group with  50% of CPU shares should be setup with a 'cpu.shares' of 1024
group with  30% of CPU shares should be setup with a 'cpu.shares' of  614
group with  15% of CPU shares should be setup with a 'cpu.shares' of  307
group with   5% of CPU shares should be setup with a 'cpu.shares' of  102

$ ./cpu_cgroup_calc.py -s2p 1024 614 307 102
group with 1024 'cpu.shares' have  50% of CPU shares
group with  614 'cpu.shares' have  30% of CPU shares
group with  307 'cpu.shares' have  15% of CPU shares
group with  102 'cpu.shares' have   5% of CPU shares

About cgroups

https://www.kernel.org/doc/Documentation/cgroup-v2.txt

...or for older kernels:

https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt