Thanks for the quick reply Aurelien. 

I tried initialising MPI from the benchmark via “call 
mpi_init_thread(MPI_THREAD_SINGLE, provided, ierror)" — it’s in Fortran -- but 
nothing changed there. I still get the same “threads are enabled” warning and 
vprotocol doesn’t seem to be used . I also tried disabling that sanity check in 
/ompi/mca/vprotocol/pessimist/vprotocol_pessimist_component.c,  but that was a 
bad idea. The runtime crashes.


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