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Problem with parallelization speedup using many CPUbs

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January 23, 2009, 06:59	Hi Andreas! Yes, definitely	#21
carsten Member Carsten Thorenz Join Date: Mar 2009 Location: Germany Posts: 34 Rep Power: 17	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. Bye, Carsten

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