Hello,

I am an undergraduate student. I have never worked with MPI and I have to use the Einstein Toolkit code which uses MPI for my project. I am running it on my personal laptop, it has two cores and four threads.

I get this error in my simulation:

Fatal error in PMPI_Comm_rank: Invalid communicator, error stack:
PMPI_Comm_rank(110): MPI_Comm_rank(comm=0x57ed58e0, rank=0x7ffe6cb18148) failed
PMPI_Comm_rank(68).: Invalid communicator
[unset]: write_line error; fd=-1 buf=:cmd=abort exitcode=609541
:
system msg for write_line failure : Bad file descriptor
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Primary job  terminated normally, but 1 process returned
a non-zero exit code.. Per user-direction, the job has been aborted.
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mpirun detected that one or more processes exited with non-zero status, thus causing
the job to be terminated. The first process to do so was:

  Process name: [[32146,1],0]
  Exit code:    5
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