Mark Knecht wrote:
Hi,
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?
If possible, I'd also like to limit the total disk bandwidth
consumption during emerge. For instance, when untarring a big file to
do the emerge at times the disk consumption gets to high and the
machine becomes laggy. Is there an option that addresses this?
These questions are mostly about being able to update a chroot
mid-day without other tasks slowing down too much. I don't care how
long the chroot really takes to get a huge emerge done, but rathe just
keeping the machine very responsive while it's happening. I already
use:
MAKEOPTS="-j3"
PORTAGE_NICENESS="15"
which helps (I think) but it doesn't totally address either of the issues above.
Thanks,
Mark
This may help:
PORTAGE_IONICE_COMMAND="ionice -c -3 -p \${PID}"
Make sure you have util-linux installed since it has the ionice
command. I think you have to have it enabled in the kernel as well.
I'm not certain tho.
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.
Hope that helps.
Dale
:-) :-)
