[mpich-discuss] MPICH2 and Python

[Rajeev Thakur]

It is odd. I suspect the real problem is probably elsewhere. If you add
python.h to any of the tests in the MPICH2 test suite in test/mpi, does it
fail?

Rajeev 

> -----Original Message-----
> From: owner-mpich-discuss at mcs.anl.gov 
> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of ddkrause
> Sent: Sunday, September 07, 2008 2:17 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: [mpich-discuss] MPICH2 and Python
> 
> Hello everybody,
> 
> today I had the pleasure to track down a bug in my software 
> which caused an error int MPI_Comm_rank due to an invalid 
> communicator.
> 
> The interesting point is that this only occurs if I include <Python.h>
> *before* <mpi.h> . There is no problem If i included it not 
> or after <mpi.h>. Is this a known problem?
> 
> I looked into the preprocessor output but couldn't find a 
> significant difference. It seems that no Python macro 
> overwrites some of the MPICH stuff (they both use a seperate 
> namespace anyway).
> 
> Any idea what's going on? I'm using mpich2-1.07.
> 
> I have no problem in interchanging the include ordering but I 
> think it's interesting to find the reason. Maybe it helps me 
> to understand some more internal details of MPICH.
> 
> Thanks & Best regards,
> Dorian Krause
> 
> PS: Due to the bunch of software I'm using here I think its 
> not helpful to include the source code but I can send it if it helps.
> 
>