If you are not using core binding, then Grid Engine does not allocate any
specific processors to the job.
It is up to the OS to assign processes (MPI tasks) to the physical processors.
-Ron
________________________________
From: Ursula Winkler <[email protected]>
To: Reuti <[email protected]>; "[email protected]"
<[email protected]>
Sent: Wednesday, April 11, 2012 2:47 AM
Subject: Re: [gridengine users] double seizure of processors
Reuti wrote:
>> I have a problem with mvapich2-jobs: if 2 jobs share the same host (e.q. two
>> 4 core jobs on a 12 core host), then the SGE allocates partly the *same*
>> cores to the two jobs so every one is only getting 50% cpu time. How can
>> this be avoided?
>>
>
> did you request any "-binding" to `qsub`? Otherwise it should be an effect of
> the scheduler in the kernel.
>
> -- Reuti
>
>
No, no "-binding" to qsub. The selection should make the SGE. But it does not
check that some cores are already used and chooses the same one a second time.
Ursula
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