Question about "pcpu" rctl

[Dustin Wenz]

As far as I know, pcpu has never worked for limiting beyond a single core. I submitted a patch for kern/kern_racct.c that should fix it:
 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=189870

Please update the bug if it does or doesn't resolve the issue. Maybe that will prompt a committer to apply it to stable.

	- .Dustin

> 
> Anyone can advise me please?
> Thanks!
>     From: John Dison via freebsd-stable <freebsd-stable at freebsd.org>
> To: "stable at freebsd.org" <stable at freebsd.org> 
> Sent: Tuesday, September 15, 2015 1:00 PM
> Subject: Question about "pcpu" rctl
> 
> Hello and have a nice day!
> 
> I try to limit cpu usage for multi-threaded process on a multi-core machine.
> I use the following command:
> # rctl -a user:myusernm:pcpu:deny=200/user
> And I expect (please correct me if I am wrong) that all processes running with uid=myusernm will consume 200% of CPU in total.
> But after that I see that multi-threaded process continues to consume all available cores on my machine.
> rctl command reports:# rctluser:myusernm:pcpu:deny=200
> What am I doing wrong?
>