Select CPU/Core type for container

[fernandogro (Fernando Guerrero Rodriguez)]

Hello,

I was reading the docker documentation and I saw there is a setting we can use to limit the specific CPUs or cores a container can use. But if my intel i7 13th gen CPU has power cores and efficiency cores and using Ubuntu 2023.10.
How do I know what kind of core will the container get assigned ?
Could it happen that a container get assigned to an efficiency core and the container performance be impacted? If this could happen, how could we ensure the container only gets power cores?

Thanks in advance

[rimelek (Ákos Takács)]

You can use the “--cpuset-cpus” option also mentioned in the documentation

Runtime options with Memory, CPUs, and GPUs

I use it in my tutorial too:

CPU limit test

That way you can use a specific CPU by referring to its number.

[capriciousduck (Krishna Chaitanya)]

@rimelek And --cpuset-cpus is only available with group v2. Am I correct?

[rimelek (Ákos Takács)]

To be honest, I’m not sure, but I don’t know why it would be the case. I think I used it before CGroup v2, but I can’t confirm it. Do you have a machine with Cgroup v1 where it doesn’t work?