[MPICH] Null Communicator error

[Guillaume Mercier]

Hello,

On Tue, 12 Dec 2006, Ravi ravi wrote:

> I am using mpich-1.2.4 on AIX cluster.
> I have a program which is terminating after the following error.
> 0 - MPI_COMM_RANK : Null communicator
> [0]  Aborting program !
> [0] Aborting program!
> p0_51120:  p4_error: : 197
> I run it by -np 2 option. Both are executing the MPI_Init() call. And the
> version of MPICH is same for compilation and running.
> But still I get this problem.
> I 'm not able find the source of the problem , so seeking some experienced
> people help.

You don't give enough information that could lead to a reliable
diagnostic. Could you send us the programm ? Thanks.
By the way, it's weird that both processes carry the same number (0).
What does MPI_Comm_rank say for each process ?

Guillaume Mercier