[Beowulf] Good IB network performance when using 7 cores, poor performance on all 8?
landman at scalableinformatics.com
Thu Apr 24 09:24:23 PDT 2014
On 04/24/2014 12:17 PM, John Hearns wrote:
> I am with Joe regarding looking at the interrupts.
> However, could this be a difference with the power management with the
> Redhat kernel?
> ie. when running on 8 cores you are tripping over some thermal threshold
> and causing a throttle back to a lower C-state?
Yeah, that was the other thing I'd forgotten about. Might want to tweak
Cstates to C1. It could be going over-power and throttling. Turn of
ASPM and other (fairly painful) things.
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics, Inc.
email: landman at scalableinformatics.com
web : http://scalableinformatics.com
twtr : @scalableinfo
phone: +1 734 786 8423 x121
cell : +1 734 612 4615
More information about the Beowulf