Thank you for your response. Attached are the script and the simple function that it calls. 

The command:
$ mpiexec -n 3 python script.py 
works great, but 30 crashes.

I am using MPICH2 Version: 1.4.1. and mpiexec version 3.1.



On Tue, Mar 11, 2014 at 4:31 PM, Lu, Huiwei <huiweilu@mcs.anl.gov> wrote:
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 <jmlarson@anl.gov> 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/hydra/pm/pmiserv/pmiserv_cb.c
>
>
> 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
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