[OMPI users] python, mpi and shell subprocess: orte_error_log

[simona bellavista]

I have written a small code in python 2.7 for launching 4 independent
processes on the shell viasubprocess, using the library mpi4py. I am
getting ORTE_ERROR_LOG and I would like to understand where it is happening
and why.

This is my code:

#!/usr/bin/python
import subprocess
import re
import sys
from mpi4py import MPI

def main():
    root='base'
    comm = MPI.COMM_WORLD
    if comm.rank == 0:
        job = [root+str(i) for i in range(4)]
    else:
        job = None

    job = comm.scatter(job, root=0)
    cmd="../../montepython/montepython/MontePython.py -conf
../config/default.conf -p ../config/XXXX.param -o ../chains/XXXX  -N
10000 > XXXX.log"

    cmd_job = re.sub(r"XXXX", job, cmd)
    subprocess.check_call(cmd_job, shell=True)
    return

if __name__ == '__main__':
  main()

I am running with the command:

mpirun -np 4 ./run.py

This is the error message that I get:

[localhost:51087] [[51455,0],0] ORTE_ERROR_LOG: Not found in file
base/odls_base_default_fns.c at line 1762
[localhost:51087] [[51455,0],0] ORTE_ERROR_LOG: Not found in file
orted/orted_comm.c at line 916
[localhost:51087] [[51455,0],0] ORTE_ERROR_LOG: Not found in file
base/odls_base_default_fns.c at line 1762
[localhost:51087] [[51455,0],0] ORTE_ERROR_LOG: Not found in file
orted/orted_comm.c at line 916
--------------------------------------------------------------------------
A system call failed during shared memory initialization that should
not have.  It is likely that your MPI job will now either abort or
experience performance degradation.

  Local host:  localhost
  System call: open(2)
  Error:       No such file or directory (errno 2)
--------------------------------------------------------------------------


I cannot understand where the error is happening. MontePython by
itself should not use mpibecause it should be serial.