MPI: mpiexec third parameter not clear

StackOverflow https://stackoverflow.com/questions/19331040

  •  30-06-2022
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Question

What exactly is the third parameter in the following MPI command 

mpiexec -n 2 cpi

Is it no. of cores? So if I am running on Pentium 4 , shall I make it 1?

Was it helpful?

Solution

  • -n 2: spawn two processes.
  • cpi: the executable.

Experiment with what is faster, one or two or more processes. Some codes run best with one process per core, some codes benefit from oversubscription.

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