[Nek5000-users] Parallel on several nodes

[nek5000-users at lists.mcs.anl.gov]

Hi Saleh,

You can develop a shell script (for example a PBS script for your cluster),
a .sh file, that you can submit to the queue. The .sh file would be very
similar to the nekbmpi script, with some extra headers, that will specify,
the number of nodes, type of job, wall clock time etc.

************************************************************************************************************
#! /bin/bash

#PBS -N turbChannel
#PBS -l walltime=400:00:00
#PBS -l nodes=6:ppn=16
#PBS -j oe
#PBS -o sparkyLog

cd $PBS_O_WORKDIR


jobName=turbChannel #name of the *.rea file
nprocs=96    #number of processors

echo $jobName        >  SESSION.NAME
echo `pwd`'/' >>  SESSION.NAME
touch $jobName.rea
rm -f logfile
rm -f ioinfo
mv $jobName.log.$nprocs $jobName.log1.$nprocs
mv $jobName.sch $jobName.sch1
mpiexec ./nek5000 > $jobName.log.$nprocs
sleep 2
ln $jobName.log.$nprocs logfile
rm -f SESSION.NAME

**************************************************************************************************************

You can see a PBS script that I use to run the job; the script name staring
from jobname, is  just the script of nekbmpi with the running variable
names replaced by specific numeric and strings (jobname, number of
processors etc.)

HtH,
Tanmoy

Best Regards,
Tanmoy

On Wed, Jan 14, 2015 at 8:57 PM, <nek5000-users at lists.mcs.anl.gov> wrote:

> Hi guys,
>
> I have a naive questions but I couldn't find my answer in existing posts.
>
> Is it possible to run Nek on several nodes, say, on a cluster? If so,
> which script should be used?
>
> A command like   /nekmpi eddy_uv 4/ does not help becaue on each node I
> have 8 CPUs but I'd like to have my 16 nodes (each have 12 CPUs) run
> together.
>
> Any help is appreciated.
>
> Saleh
>
>
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> Nek5000-users at lists.mcs.anl.gov
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