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Can only run one MPI job on Windows

I may not be in the right forum, so redirect if necessary.

My organization distributes a large Fortran program that uses MPI. We distribute the Intel MPI redistributable libs and we use the hydra service. Our users typically run MPI jobs directly from the command prompt, i.e.

mpiexec -n 3 ...

Many have commented that they can only run one MPI job at once. Is this just a result of not using HPC or more sophisticated scheduling system? Or are we missing something when we bundle up our download?

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