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-   -   Is this meaningful to run parallel in this way? (http://www.cfd-online.com/Forums/openfoam-solving/64498-meaningful-run-parallel-way.html)

lakeat May 13, 2009 06:59

Is this meaningful to run parallel in this way?
 
Hi Forum,

Bcoz I have difficulties to insert "-parallel" option to my supercomputer (They did not let me execute mpirun command directly), so I am trying the possible solution like this:

Suppose I have a 4-cores Intel CPU personal computer,
Can I execute the mpirun command without "-parallel" option (without decomposePar first), like this:
mpirun -np 4 `which icoFoam` -case $FOAM_RUN/tutorials/icoFoam/cylinder > log &


Is this meaningful? Please help:confused:.. Thank you.

kbr May 13, 2009 09:04

Hi,

this means you run your case as a single case 4 times on 4 CPUs. I think that's not what you want to do.

Kerstin

lakeat May 13, 2009 09:30

Okay, how then can I achieve this goal??
I am using a super computer managed by lsf system, instead execute
Code:

mpirun -np 4 icoFoam -parallel > log &;
everytime I need to do:
Code:

bsub ./c.lsf
to submit my case to the queue. where, c.lsf file is:
Code:

APP_NAME=snode
NP=16
RUN="`which icoFoam` -case /home/users/temp/OpenFOAM/temp-1.5/run/tutorials/icoFoam/cylinder -parallel > log"

and then it stops with complains as shown in log file:
Code:

attempt to run parallel on 1 processor.....FOAM aborting...
This error is very annoying! Since the lsf system will dynamically appoint 16 nodes to do the job (so I think It's not available to appoint host names by "-hostfile machines"), and lsf cannot correctly pass the "-parallel" option, regarding this as an attempt to run parallel on 1 processor!!!!!!:(

What can I do? Please
The question is now "How to use lsf system to manage the foam Job"

lakeat May 13, 2009 10:40

I know in Fluent, there's option "-lsf" and "-mpi=", eg.
bsub -I fluent 3d -lsf
but OpenFOAM, only gives a "-parallel" option, is is possible to provide such more convenient option?


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