[Beowulf] slow jobs when run through queue

Chris Samuel chris at csamuel.org
Tue Dec 5 22:27:54 PST 2017

On Wednesday, 6 December 2017 4:47:42 PM AEDT Nick Evans wrote:

> Thanks Brian / Carl / Chris for places to look.... it turned out to be what
> Chris had mentioned and they were only requesting 1 CPU but trying to use
> all 48 in the machine.

There's the handy "nproc" command which will tell you how many cores you can 
actually use - it's cgroups aware so it won't just blindly report all the 
cores in the host.    It's also part of coreutils so you should be able to 
rely on it being there.

> Resubmitted the request asking for all CPU's and the job ran in the expected
> amount of time.

Great news!

All the best,
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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