[Beowulf] Torque Error: multi-req PBS jobs not allowed
rpnabar at gmail.com
Mon Apr 20 17:59:31 EDT 2009
Often I need to request 9 cpus on our architecture with 8 cpus/server.
In such situations it makes sense to ask for a full server (8 cpus)
plus 1 more cpu wherever I can get it.
What is the best request to do this? [Scheduler: PBS-Torque;
I am trying
#PBS -l nodes=1:ppn=8+1:ppn=1
The job gets queued but checkjob reveals an error due to which it won't run:
Torque Error: multi-req PBS jobs not allowed
On the other hand jobs with the following request run without trouble:
#PBS -l nodes=node01:ppn=8+node02:ppn=1
Why is one form (more restrictive) ok and the other (less restrictive)
not? Is this just non-intuitive behavior or a PBS bug?
Some googling shows that perhaps "ENABLEMULTIREQJOBS" might be my
But just wanted to get an opinion if others have this enabled or not.
What, if any, are the downsides?
Why would PBS-Torque not allow this and my previous threads
"JOBNODEMATCHPOLICY EXACTNODE" by default? Are there any reasons not
to use them? The compromise is not obvious to me.
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