Does any one know of an equivalent of the GNU/Linux utility cpulimit for FreeBSD?

I'm not talking about process niceness or setting limits on a user account, but actually limiting the percentage of cpu used by a specific process.

2 Answers 2


Using the /etc/login.conf file, you can set a limit on max CPU time a process is allowed to consume, but it's not currently possible to limit the percentage of the CPU an individual process uses. (Reference here)

You might be able to accomplish a similar effect by running the process in a jail and limiting the resources for the jail

  • Yes, I knew about the possibility of using limits.conf in a jail, but that's not quite what I was looking for. I guess I'll have to take a look at the cpulimit source and see how it's implemented, and check out the FreeBSD kernel calls to see if it is remotely feasible to implement an equivalent.
    – jns
    May 18, 2009 at 0:03

There is also a new utility, cpuset , which you can use to limit certain processes to certain cpu's.

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