On 6/11/20 8:46 PM, Gordon Messmer wrote:
On 6/11/20 3:09 PM, Patrick O'Callaghan wrote:
It relates to competition in the sense that keeping host and guest to
disjoint sets of cores avoids them competing for the same cores and
hence contaminating the respective caches. That's all I mean. Don't
read too much into it. Clearly the whole set is still being scheduled
by the host system.
Oh, now I see what you're getting at. If I'm wrong, I hope someone
chimes in to correct me:
Setting the CPU affinity of a process in Linux (which is what we're
talking about) will cause the scheduler to always schedule the process
on those CPUs, but it doesn't prevent the kernel or any other process
from using those CPUs. That is, it doesn't reserve those CPUs for the
exclusive use of the process that you're setting the affinity for. So,
it's not minimizing competition in the way that you think it is, if I
understand what you're getting at.
You can also specify that certain cores are dedicated to certain
processes and the kernel won't schedule anything else on them.
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