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Problem with parallelization speedup using many CPUbs

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Old   January 23, 2009, 07:59
Default Hi Andreas! Yes, definitely
Carsten Thorenz
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Hi Andreas!

Yes, definitely you're running on a single CPU. This explains the strange results.

About your job-script: I had similar problems when trying to run with the supplied OpenMPI and PBS. Do you use OpenMPI?

If yes, you should try to change your execution line to:

mpirun -hostfile m_nodes -np $nrnodes $solver $PBS_O_WORKDIR $casename -parallel

This delives the names of the "slaves" to mpirun.


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