*** PLEASE USE 'module load gnu-openmpi' ***
*** Loading module... ***

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WARNING: There is at least one OpenFabrics device found but there are
no active ports detected (or Open MPI was unable to use them).  This
is most certainly not what you wanted.  Check your cables, subnet
manager configuration, etc.  The openib BTL will be ignored for this
job.

  Local host: classroom
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HELLO - Master process:
  C++ version

  The number of processes is 8

  Hello from process 0
  Hello from process 1
  Hello from process 2
  Hello from process 4
  Hello from process 6
  Hello from process 7
  Hello from process 3
  Hello from process 5
[classroom:19476] 7 more processes have sent help message help-mpi-btl-openib.txt / no active ports found
[classroom:19476] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages