CPU Configuration and Physical CPU Allocated

General
1

Hi all,
Can anyone point me how a docker container manage its physical resources, i.e. CPU? We can see in hyper-V, they have CPU groups for VMs, do we have some similar concept to that?

More specificly, if we configured 1.5 cpus for a container, what are the steps to assign 1.5 physical CPUs to the container?

Thanks,

2

Hello @zongshun96 ,

Hope this link may help you Runtime options with Memory, CPUs, and GPUs | Docker Documentation. Please refer, there both CPU and the memory assigning and usage is explained in detail.

regards,
Siddhartha V

1 Like
4

How can we know which vCPUs are assigned to which physical core? Would you like to mention more about how this assignment works internally?

It seems I can set --cpuset-cpus so my container use specific physical CPUs, but I cannot find how or whether multiplexing virtual CPUs over physical CPUs happens in this case.

Thanks,

5

Hi Siddhartha,
It looks like that pointer misses the discussion of how those APIs(options) works internally, i.e., --cpus=<value> says a container can use such amount of CPU cycles but doesn’t explain how those cycles are “distributed” among physical CPUs, --cpuset-cpus mentions which physical CPUs to use but doesn’t talk about if or how multiplexing of virtual CPU happens.

Would you like to send a pointer(s) that contains deeper information? Or maybe papers describing docker container architecture overall?

Thanks,
Zongshun