|March 29, 2012, 04:17||
Purpose of the -parallel parameter
Join Date: Feb 2012
Posts: 194Rep Power: 17
I am running a parallel job and I forgot the -parallel parameter, so my command to start the simulation looked like this
mpirun -np 4 twoPhaseEulerFoam
The simulation runs and the system monitor tells me that there are in fact 4 processes running. The only difference to a normal parallel run is, that in the processor* folders there is only a 0 and a constant folder.
The computed time steps are stored in the case directory.
Can anyone describe what exactly happens if I omit the -parallel parameter?
I guess storing the field-information every time step requires some time, but running reconstructPar after the computation also does.
|March 29, 2012, 04:26||
Join Date: Mar 2009
Location: Stockholm, Sweden
Posts: 693Rep Power: 21
without -parallel the processors will run the same job (in serial)
try running 'mpirun -np 4 ls'
it will run the same ls-command 4 times, on each processor.
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