[mpich-discuss] Increasing MPI ranks

[Jeffrey Larson]

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 at 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 at 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 at mintthinkpad test]$ mpiexec -n 30 python script.py
> >
> > I receive the following error messages:
> >
> > [mpiexec at mintthinkpad] handle_pmi_cmd (pm/pmiserv/pmiserv_cb.c:52):
> Unrecognized PMI command:  | cleaning up processes
> > [mpiexec at mintthinkpad] control_cb (pm/pmiserv/pmiserv_cb.c:280): unable
> to process PMI command
> > [mpiexec at mintthinkpad] HYDT_dmxu_poll_wait_for_event
> (tools/demux/demux_poll.c:76): callback returned error status
> > [mpiexec at mintthinkpad] HYD_pmci_wait_for_completion
> (pm/pmiserv/pmiserv_pmci.c:198): error waiting for event
> > [mpiexec at 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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