[mpich-discuss] Increasing MPI ranks

[Jeffrey Larson]

Now that I look closer, I don't believe that the version 1.4.1 is actually
being used. Just the mpich2version command refers to the old version:

[jlarson at mintthinkpad ~]$ which mpiexec
/home/jlarson/software/mpich-install/bin/mpiexec
[jlarson at mintthinkpad ~]$ which mpicc
/home/jlarson/software/mpich-install/bin/mpicc
[jlarson at mintthinkpad ~]$ which mpich2version
/usr/bin/mpich2version



On Tue, Mar 11, 2014 at 4:41 PM, Lu, Huiwei <huiweilu at mcs.anl.gov> wrote:

> A quick question before we digging into the script: why are you using
> different version of MPICH2 and mpiexec?
>
> --
> Huiwei
>
> On Mar 11, 2014, at 4:37 PM, Jeffrey Larson <jmlarson at anl.gov> wrote:
>
> > 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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> >
> > <function.py><script.py>_______________________________________________
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