python script failing on mpi

Question

I am trying to run a python script which runs fine on 1 processor, however, when I try to run it using mpi (6 processors) it fails giving the following error:

MPI_INIT has failed because at least one MPI process is unreachable from another. This usually means that an underlying communication plugin -- such as a BTL or an MTL -- has either not loaded or not allowed itself to be used. Your MPI job will now abort.

You may wish to try to narrow down the problem;

• Check the output of ompi_info to see which BTL/MTL plugins are available.
• Run your application with MPI_THREAD_SINGLE.
• Set the MCA parameter btl_base_verbose to 100 (or mtl_base_verbose, if using MTL-based communications) to see exactly which communication plugins were considered and/or discarded.

I am not sure what is causing this problem. I am using a cluster on which my other mpi jobs run without a problem. For this job I created a virtual python environment, in which I installed libraries like plotly, tqdm, h5py, mpi4py and numpy.

question from:https://stackoverflow.com/questions/65907482/python-script-failing-on-mpi

Answer 1

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