Question

1

How to limit users to N cores?

rated 0 times [ 1] [ 0] / answers: 1 / hits: 2958 / 3 Years ago, sun, may 30, 2021, 11:58:28

I have an SSH server where users login to do various tasks. The problem is I have 4 cores, and one user is running tasks on 4. How can I limit the number of cores any given user can use?

This is not a virtual machine.

UPDATE:
I was reading /etc/security/limits.conf
and saw

#*               soft    core            0

#root            hard    core            100000

#*               hard    rss             10000

#@student        hard    nproc           20

#@faculty        soft    nproc           20

#@faculty        hard    nproc           50

#ftp             hard    nproc           0

#ftp             -       chroot          /ftp

#@student        -       maxlogins       4

I tried setting this up so that a user is limited to 3 processes.
but the user gets

 -bash: fork: retry: No child processes

in their terminal.

I have started looking into ulimit, and quota

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2 Years ago

answered 3 Years ago leddre · Accepted Answer

taskset(1) may help you. It can set the core number for one process.
You can use ps(1) to get all the process of target user. For example,

housezet@arch: ~

$ ps aux | awk '/^housezet/{print $2}' | xargs -l taskset -p 0x00000001

This wil limit housezet's current process only use one core.
And if limiting cpu usage is also acceptable, you can also consider using cpulimit(1).