On 8/31/2011 11:48 PM, Randolph Pullen wrote:
I recall a discussion some time
ago about yield, the Completely F%’d Scheduler (CFS) and
My system is currently suffering from massive CPU use
while busy waiting. This gets worse as I try to bump up
I am running with yield_when_idle but its not enough.
I think OMPI doesn't yet do (much/any) better than what you've
observed. You might be able to hack something up yourself. In
something I did recently, I replaced blocking sends and receives
with test/nanosleep loops. An "optimum" solution (minimum latency,
optimal performance at arbitrary levels of under and
oversubscription) might be elusive, but hopefully you'll quickly be
able to piece together something for your particular purposes. In
my case, I was lucky and the results were very gratifying... my
bottleneck vaporized for modest levels of oversubscription (2-4 more
processes than processors).
Is there anything else I can do
to release some CPU resource?
I recall seeing one post where usleep(1) was inserted
around the yields, is this still feasible?
I'm using 1.4.1 - is there a
fix to be found in upgrading?
I am stuck with the CFS as I need Linux. Currently its
Ubuntu 10.10 with 220.127.116.11