[Numpy-discussion] Numpy multiple instances

[santhu kumar]

Hello,

I have embedded python/numpy scripts in an application that runs in
parallel.
But the python code is always invoked on the master node.
So it could be assumed that at some point, there could be multiple
instances of script being invoked and run.

I have commented out import numpy part to see if both get the same sys.path
and here are the sys.path:

>From C : Replica ID value 0
>From Python : The replicaId 0 of 2 simulations running at 0.0 with 27319
atoms
['/usr/lib64/python24.zip', '/usr/lib64/python2.4',
'/usr/lib64/python2.4/plat-linux2', '/usr/lib64/python2.4/lib-tk',
'/usr/lib64/python2.4/lib-dynload', '/usr/lib64/python2.4/site-packages',
'/usr/lib64/python2.4/site-packages/Numeric',
'/usr/lib64/python2.4/site-packages/gtk-2.0',
'/usr/lib/python2.4/site-packages', 'python_custom']

>From C : Replica ID value 1
>From Python : The replicaId 1 of 2 simulations running at 0.0 with 27319
atoms
['/usr/lib64/python24.zip', '/usr/lib64/python2.4',
'/usr/lib64/python2.4/plat-linux2', '/usr/lib64/python2.4/lib-tk',
'/usr/lib64/python2.4/lib-dynload', '/usr/lib64/python2.4/site-packages',
'/usr/lib64/python2.4/site-packages/Numeric',
'/usr/lib64/python2.4/site-packages/gtk-2.0',
'/usr/lib/python2.4/site-packages', 'python_custom']

But once I uncomment, import numpy as np part in the script,

>From C : Replica ID value 0
>From Python : The replicaId 0 of 2 simulations running at 0.0 with 27319
atoms
['/usr/lib64/python24.zip', '/usr/lib64/python2.4',
'/usr/lib64/python2.4/plat-linux2', '/usr/lib64/python2.4/lib-tk',
'/usr/lib64/python2.4/lib-dynload', '/usr/lib64/python2.4/site-packages',
'/usr/lib64/python2.4/site-packages/Numeric',
'/usr/lib64/python2.4/site-packages/gtk-2.0',
'/usr/lib/python2.4/site-packages', 'python_custom']
>From C : Replica ID value 1
Traceback (most recent call last):
  File "python_custom/customF.py", line 3, in ?
    import numpy
ImportError: No module named numpy

Just giving some more information : When I embedded the python call in C, I
had to comment out Py_Finalize() as numpy was throwing an error when trying
to finalize.

Any ideas/suggestions on whats happening ? Do I need to do something
special to have multiple instances of python/numpy in C?
Thanks
Santhosh
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