Hi, Jeffrey, Can you send us a minimum example of your script.py? Simple python scripts seem to work fine for me on both Mac and Ubuntu machines. Also, what version of MPICH are you using? — Huiwei Lu Postdoc Appointee Mathematics and Computer Science Division, Argonne National Laboratory http://www.mcs.anl.gov/~huiweilu/ On Mar 11, 2014, at 4:08 PM, Jeffrey Larson <[email protected]> wrote:

Hello,

I am using mpi4py to call MPI from python, and when I increase the number of ranks at the command line so something like:

[jlarson@mintthinkpad test]$ mpiexec -n 30 python script.py

I receive the following error messages:

[mpiexec@mintthinkpad] handle_pmi_cmd (pm/pmiserv/pmiserv_cb.c:52): Unrecognized PMI command: | cleaning up processes [mpiexec@mintthinkpad] control_cb (pm/pmiserv/pmiserv_cb.c:280): unable to process PMI command [mpiexec@mintthinkpad] HYDT_dmxu_poll_wait_for_event (tools/demux/demux_poll.c:76): callback returned error status [mpiexec@mintthinkpad] HYD_pmci_wait_for_completion (pm/pmiserv/pmiserv_pmci.c:198): error waiting for event [mpiexec@mintthinkpad] main (ui/mpich/mpiexec.c:336): process manager error waiting for completion

When I search online for help with these error messages, I am only pointed towards the repository containing the files that are themselves throwing the error. For example: Googling for "handle_pmi_cmd Unrecognized PMI command" only returns:

https://svn.mcs.anl.gov/repos/mpi/mpich2/tags/release/mpich2-1.3a1/src/pm/hy...

Note that my script is using very few resources; each rank is spawning a simple external function. The function takes a vector and then sums all the entries, squares them, and returns the number to each rank. The script works as expected when the number of initial ranks is small.

Thank you for your help. Jeffrey Larson _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss