Hi, I am having problem running MPICH, on multiple nodes. When I run an multiple MPI processes on one node, it totally works, but when I try to run on multiple nodes, it fails with the error below. My machines have Debian OS, Both infiniband and TCP interconnects. I'm guessing it has something do to with the TCP network, but I can run openmpi on these machines with no problem. But for some reason I cannot run MPICH on multiple nodes. Please let me know if more info is needed from my side. I'm guessing there are some configuration that I am missing. I used MPICH 3.1.3 for this test. I googled this problem but couldn't find any solution. In my MPI program, I am doing a simple allreduce over MPI_COMM_WORLD. my host file (hosts-hydra) is something like this: oakmnt-0-a:1 oakmnt-0-b:1 I get this error: $ mpirun -hostfile hosts-hydra -np 2 test_dup Assertion failed in file ../src/mpi/coll/helper_fns.c at line 490: status->MPI_TAG == recvtag Assertion failed in file ../src/mpi/coll/helper_fns.c at line 490: status->MPI_TAG == recvtag internal ABORT - process 1 internal ABORT - process 0 =================================================================================== = BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES = PID 30744 RUNNING AT oakmnt-0-b = EXIT CODE: 1 = CLEANING UP REMAINING PROCESSES = YOU CAN IGNORE THE BELOW CLEANUP MESSAGES =================================================================================== [mpiexec@vulcan13] HYDU_sock_read (../../../../src/pm/hydra/utils/sock/sock.c:239): read error (Bad file descriptor) [mpiexec@vulcan13] control_cb (../../../../src/pm/hydra/pm/pmiserv/pmiserv_cb.c:199): unable to read command from proxy [mpiexec@vulcan13] HYDT_dmxu_poll_wait_for_event (../../../../src/pm/hydra/tools/demux/demux_poll.c:76): callback returned error status [mpiexec@vulcan13] HYD_pmci_wait_for_completion (../../../../src/pm/hydra/pm/pmiserv/pmiserv_pmci.c:198): error waiting for event [mpiexec@vulcan13] main (../../../../src/pm/hydra/ui/mpich/mpiexec.c:344): process manager error waiting for completion Thanks. Amin Hassani, CIS department at UAB, Birmingham, AL, USA. _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss