MPI does not work

[lomlrn]

Hi there,

im following your "Parallel Tutorial" but it seems to be a bit outdated.

The script

from ATK.MPI import *
 
if processIsMaster():
    print '# Master node'
else:
    print '# Slave node'


produces only:


Traceback (most recent call last):
  File "test_mpi.py", line 1, in <module>
    from ATK.MPI import *
ImportError: No module named ATK.MPI


Can you give an updated example?

[Anders Blom]

Sorry about that! You can just ignore that line. Here is a much more informative script example:

Code: (python)

import socket
if processIsMaster():
    print 'Master node:',
else:
    print 'Slave node:',
print socket.gethostname()

In addition to writing out master/slave it also writes on which host each process runs; the allows you to also see how the different machines are allocated, to ensure you use all machines as intended and not piling all MPI process onto the same node.

[Anders Blom]

Btw, where did you find the version of the "Parallel Guide" you refer to? The latest online version has the correct (simpler) script without the "from ATK.MPI import *" statement which dates back to 2008.10 - a version which is not longer in circulation officially...

I just want to know, so we can remove any old reference to wrong tutorials if they are found on our website.