[MPICH2-dev] a problem with one-sided communication

[Rajeev Thakur]

Thomas,
       Yes, that was a bug that affected all channels of MPICH2 except the
sshm channel. I have fixed it and added a test. I can send you a patch if
you like.

Rajeev
 

> -----Original Message-----
> From: owner-mpich2-dev at mcs.anl.gov 
> [mailto:owner-mpich2-dev at mcs.anl.gov] On Behalf Of Thomas Worsch
> Sent: Monday, March 20, 2006 9:40 AM
> To: mpich2-dev at mcs.anl.gov
> Cc: diesse at ira.uka.de
> Subject: [MPICH2-dev] a problem with one-sided communication
> 
> Dear experts,
> 
> when chasing down a problem a user has with the onesided benchmarks in
> SKaMPI-5 we ended up with the following simple program:
> 
> #include <stdio.h>
> #include <mpi.h>
> 
> int main(int argc, char* argv[])
> {
>   MPI_Win win;
>   MPI_Group group;
> 
>   MPI_Init(&argc, &argv);
> 
>   MPI_Win_create(NULL, 0, 1, MPI_INFO_NULL, MPI_COMM_WORLD, &win);
>   MPI_Win_get_group(win, &group);
>   
>   MPI_Win_post(group, 0, win);
>   MPI_Win_start(group, 0, win);
>   
>   printf("before MPI_Win_complete\n");  /* this is the only 
> output we get */
>   MPI_Win_complete(win);
>   printf("after MPI_complete\n");       /* we never get to 
> this point ??? */
>   
>   MPI_Win_wait(win);
> 
>   MPI_Finalize();
>   return 0;
> }
> 
> The observation is that this program runs just fine (we tried 1 and 2
> processes) on an IBM SP and on our PCs using LAM 7.1.1, but it
> apparently hangs in MPI_Win_complete when using mpich2 (we tried 0.971
> and 1.0.3).
> 
> Is this behavior compliant with the mpi2 standard?
> 
> Best regards,
> 
> Thomas Worsch
> (for the SKaMPI-5 team)
> 
>