[Beowulf] Not all cores are created equal
csamuel at vpac.org
Mon Dec 29 19:27:59 EST 2008
----- "Nifty Tom Mitchell" <niftyompi at niftyegg.com> wrote:
> On Wed, Dec 24, 2008 at 09:03:38PM +1100, Chris Samuel wrote:
> > I contemplated doing this on our Barcelona cluster, but
> > sacrificing 1 core in 8 was a bit too much of a high price
> > to pay. But people with higher core counts per node might
> > find it attractive.
> This seems like a be a benchmark decision based on application
> load and 'implied IO+OS' loading as well as the ability to
> localize the IO+OS activity to the sacrificed CPU core.
I'll leave that to sites that have a benchmarkable and
characterisable workload. :-) We've got over 600 random
users running random code (some very random indeed )
that covers all categories from self-written, through open
source to commercial apps.
 - including a commercial code that segfaults in one
particular program in libmsxml.so - yes, that appears to
be a 3rd party implementation of the M$ XML library on Linux.
When reported they claimed it was because we were running
CentOS5 not RHEL4. Can't reproduce on RHEL4 because it
crashes *before* that point on that distro. Gah.
Christopher Samuel - (03) 9925 4751 - Systems Manager
The Victorian Partnership for Advanced Computing
P.O. Box 201, Carlton South, VIC 3053, Australia
VPAC is a not-for-profit Registered Research Agency
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