CODEWITHSUNDEEP
processmpipid
medivh
medivh

Reputation: 71

mpi process ids

I would like to get the process ids of an mpi application which I start with mpirun/mpiexec tools.

For example I run my code with lets say 8 processes and want to get the process ids of all these 8 processes right at the beginning of the execution to give to another tool as an input.

What would be the right way to do this?

Upvotes: 1

Views: 3299

Answers (1)

High Performance Mark
High Performance Mark

Reputation: 78316

I don't believe that there is any MPI library routine which will return the pid of the o/s process which is running an MPI process. To be absolutely precise I don't think that the MPI standard requires there to be a one:one mapping between MPI processes and o/s processes, nor any other cardinality of mapping, though I don't think I've ever used an MPI implementation where there wasn't a one:one mapping between the different views of processes.

All that aside, why not simply use getpid if you are on Linux machine ? Each MPI process should get its own pid. I guess there is a Windows system call which does the same thing but I don't know much about Windows.

Upvotes: 4

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