How to specify machine in Allrun files

killsecond · July 13, 2014, 22:27

Hi all,
I want to run my case on a cluster, but something puzzles me.
I know that if I want to run in parallel, I need to specify the machine name in a file name "machines" and run the case with the command such as "mpirun --hostfile <machines> -np <nProcs><foamExec> <otherArgs> -parallel".
However if I want to use Allrun files to run the case, I don't know where to specify the machine name in the Allrun files. In the tutorials of OpenFOAM, I just find that the solver and core numbers are specified in the Allrun files. For example, "runParallel potentialFoam 8".
Any help will be appreciated!

feacluster · May 15, 2018, 13:16

I have the same question. How do I modify the Allrun file to specify a hostfile? I believe the line is:

runParallel $decompDict $(getApplication)

Would it be simply a matter of commenting that out and using:

mpirun $decompDict -np 18 simpleFoam -parallel

kera · May 16, 2018, 04:19

Hallo,

I am not sure if this helps, but I have discussed one such scenario in this thread.

Regards,
Ricky

feacluster · May 18, 2018, 15:29

I figured it out. Basically in the Allrun file I have to replace all the runParallel lines with mpirun:

#runParallel $decompDict snappyHexMesh -overwrite
mpirun -np XX -hostfile ./machinefile snappyHexMesh -overwrite -parallel

#runParallel $decompDict patchSummary
mpirun -np XX -hostfile ./machinefile patchSummary -parallel

#runParallel $decompDict potentialFoam
mpirun -np XX -hostfile ./machinefile potentialFoam -parallel

#runParallel $decompDict $(getApplication)
mpirun -np XX -hostfile ./machinefile simpleFoam -parallel

where XX is the total number of cpus on all the machines in the machinefile.

July 13, 2014, 22:27	How to specify machine in Allrun files	#1
killsecond New Member Zhiwei Zheng Join Date: May 2014 Posts: 23 Rep Power: 11	Hi all, I want to run my case on a cluster, but something puzzles me. I know that if I want to run in parallel, I need to specify the machine name in a file name "machines" and run the case with the command such as "mpirun --hostfile <machines> -np <nProcs><foamExec> <otherArgs> -parallel". However if I want to use Allrun files to run the case, I don't know where to specify the machine name in the Allrun files. In the tutorials of OpenFOAM, I just find that the solver and core numbers are specified in the Allrun files. For example, "runParallel potentialFoam 8". Any help will be appreciated!

May 16, 2018, 04:19		#3
kera Member Ricky Join Date: Jul 2014 Location: Germany Posts: 78 Rep Power: 11	Hallo, I am not sure if this helps, but I have discussed one such scenario in this thread. Regards, Ricky __________________ If it is easy, then something is fishy!

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May 15, 2018, 13:16		#2
feacluster New Member Faraz Join Date: Mar 2018 Posts: 23 Rep Power: 8	I have the same question. How do I modify the Allrun file to specify a hostfile? I believe the line is: runParallel $decompDict $(getApplication) Would it be simply a matter of commenting that out and using: mpirun $decompDict -np 18 simpleFoam -parallel

May 18, 2018, 15:29		#4
feacluster New Member Faraz Join Date: Mar 2018 Posts: 23 Rep Power: 8	I figured it out. Basically in the Allrun file I have to replace all the runParallel lines with mpirun: #runParallel $decompDict snappyHexMesh -overwrite mpirun -np XX -hostfile ./machinefile snappyHexMesh -overwrite -parallel #runParallel $decompDict patchSummary mpirun -np XX -hostfile ./machinefile patchSummary -parallel #runParallel $decompDict potentialFoam mpirun -np XX -hostfile ./machinefile potentialFoam -parallel #runParallel $decompDict $(getApplication) mpirun -np XX -hostfile ./machinefile simpleFoam -parallel where XX is the total number of cpus on all the machines in the machinefile.