Re: [gentoo-user] Limit number of cores used by emerge?

[Dale]

Michael Mol wrote:
> On Fri, Sep 30, 2011 at 12:55 PM, Dale<rdalek1967@×××××.com>  wrote:
>> Mark Knecht wrote:
>>>     Is there a portage option that will limit the number of cores used
>>> by emerge? For instance, in a chroot on a 12 core machine I want to
>>> limit emerge to not using more than 3 cores?
>> On my machine, even if I tell emerge to only do one job at a time, it still
>> staggers around the cores.  I guess it makes the CPU heat spread out evenly
>> or something.
> Difference between "number of cores" and "which cores"..."-j1" should
> mean it won't use more than one core at a time, but it might switch
> around which core when the process gets descheduled and brought back.
> (Or when a process ends and another is spawned)
>


I'm not certain of why but when I am doing anything CPU intensive, it 
bounces from one core to another every 15 or 20 seconds.  I just assume 
it is a heat thing.  I created a 6Gb tarball the other day that took 
quite a while.  It looks like a bar graph equalizer with the processes 
bouncing around from core to core.  I just thought it worth mentioning 
in case the OP didn't realize this.  Heck, I have had this happen with 
Seamonkey and I don't think it even sees multiple cores or anything.

I also forgot to mention that the IONICE line goes in make.conf if you 
want it to be used each time.

Dale

:-)  :-)