Hi Nathan,

surely, OpenMPI was compiled with the Valgrind support:

%/opt/mpi/openmpi-1.8.4.dbg/bin/ompi_info | grep -i memchecker
          MCA memchecker: valgrind (MCA v2.0, API v2.0, Component v1.8.4)

The following configure options were used:

--enable-mem-debug --enable-debug --enable-memchecker --with-valgrind 
--with-mpi-param-check

Best,
Victor.

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