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Subject: Re: [OMPI devel] Win_fence() with assertion=MPI_MODE_NOPRECEDE|MPI_MODE_NOSUCCEED
From: Nathan Hjelm (hjelmn_at_[hidden])
Date: 2014-04-22 19:48:04


It looks like the standard does not explicitly forbid that combination
of assertions so I will remove the check. Be aware that assertion will
effectively be a no-op because you are saying no operation proceed or
succeed the fence call making the call pointless.

-Nathan

On Mon, Apr 21, 2014 at 02:11:47PM +0300, Lisandro Dalcin wrote:
> Open MPI errors in Win_fence() when the assertion contains both
> MPI_MODE_NOPRECEDE and MPI_MODE_NOSUCCEED
>
> Could you explain me why the following code is wrong? Please note that
> the fence call with assertion !=0 is issued before and after fence
> calls with assertion=0, and I'm not making any modification to the
> local window, nor issuing any RMA call. My understanding of MPI RMA
> operations is quite limited, but I would say that my code is valid and
> should not fail.
>
> [dalcinl_at_kw2060 openmpi]$ cat win_fence.c
> #include <mpi.h>
> int main(int argc, char *argv[])
> {
> MPI_Win win;
> MPI_Init(&argc, &argv);
> MPI_Win_create(MPI_BOTTOM, 0, 1, MPI_INFO_NULL, MPI_COMM_SELF, &win);
> MPI_Win_fence(0, win);
> MPI_Win_fence(MPI_MODE_NOSTORE|MPI_MODE_NOPUT|MPI_MODE_NOPRECEDE|MPI_MODE_NOSUCCEED,
> win);
> MPI_Win_fence(0, win);
> MPI_Finalize();
> return 0;
> }
> [dalcinl_at_kw2060 openmpi]$ mpicc win_fence.c
> [dalcinl_at_kw2060 openmpi]$ ./a.out
> [kw2060:19890] *** An error occurred in MPI_Win_fence
> [kw2060:19890] *** reported by process [140737129086977,0]
> [kw2060:19890] *** on win rdma window 3
> [kw2060:19890] *** MPI_ERR_ASSERT: invalid assert argument
> [kw2060:19890] *** MPI_ERRORS_ARE_FATAL (processes in this win will now abort,
> [kw2060:19890] *** and potentially your MPI job)
> [dalcinl_at_kw2060 openmpi]$
>
>
> --
> Lisandro Dalcin
> ---------------
> CIMEC (UNL/CONICET)
> Predio CONICET-Santa Fe
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