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Subject: Re: [OMPI users] An mpirun question
From: Terry Frankcombe (terry_at_[hidden])
Date: 2009-04-16 07:06:51


Hi Min Zhu

You need to read about hostfiles and bynode/byslot scheduling. See
here:
<http://www.open-mpi.org/faq/?category=running#mpirun-scheduling>

Ciao

On Thu, 2009-04-16 at 10:43 +0100, Min Zhu wrote:
> Dear all,
>
>
>
> I wonder if you could help me with this question.
>
> I have got 3 Linux servers with 8 processors on each server. If I want
> to run a job using mpirun command
>
> and specify the number of processors to be used on each server. Is
> there any way to do this? At the moment,
>
> I find that I can only issue such command “mpirun –np 14 –host
> cfd1,cfd2 ./wrf.exe’ which means the mpirun
>
> Will run the job using 7 processors on each server cfd1 and cfd2. Can
> I specify say using 8 processors on cfd1 and
>
> 6 processors on cfd2? I ask this question because I found that the
> different combination of processors on those
>
> Servers can influence the computation time dramatically. Thank you
> very much in advance,
>
>
>
> Cheers,
>
>
>
> Min Zhu
>
>
>
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