No - you get the same error - it looks as if process 1 (on the remote node) is not starting svr:tladd(netbench)> mpirun -n 2 -f hosts /global/usr/src/mpich-3.0.4/examples/cpi Process 0 of 2 is on svr.che.ufl.edu Fatal error in PMPI_Reduce: A process has failed, error stack: PMPI_Reduce(1217)...............: MPI_Reduce(sbuf=0x7fff30ecced8, rbuf=0x7fff30ecced0, count=1, MPI_DOUBLE, But if I reverse the order in the host file (pc5 first and then svr) apparently both processes start svr:tladd(netbench)> mpirun -n 2 -f hosts /global/usr/src/mpich-3.0.4/examples/cpi Process 1 of 2 is on svr.che.ufl.edu Process 0 of 2 is on pc5 Fatal error in PMPI_Reduce: A process has failed, error stack: PMPI_Reduce(1217)...............: MPI_Reduce(sbuf=0x7fff4d776348, rbuf=0x7fff4d776340, count=1, MPI_DOUBLE, But with the same result in the end. Tony On 03/26/2014 08:18 PM, Rajeev Thakur wrote:

Does the cpi example run across two machines?

Rajeev

On Mar 26, 2014, at 7:13 PM, Tony Ladd <[email protected]> wrote:

...

Rajeev

Sorry about that. I was switching back and forth from openmpi to mpich. But it does not make a difference. Here is a clean log from a fresh terminal - no mention of openmpi

Tony

PS - its a CentOS 6.5install - should have mentioned it before.

-- Tony Ladd

Chemical Engineering Department University of Florida Gainesville, Florida 32611-6005 USA

Email: tladd-"(AT)"-che.ufl.edu Web http://ladd.che.ufl.edu

Tel: (352)-392-6509 FAX: (352)-392-9514

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-- Tony Ladd Chemical Engineering Department University of Florida Gainesville, Florida 32611-6005 USA Email: tladd-"(AT)"-che.ufl.edu Web http://ladd.che.ufl.edu Tel: (352)-392-6509 FAX: (352)-392-9514