[mvapich-discuss] segfaults in multi-threaded MPI communications

[Krishna Kandalla]

Hi Brody,
      MVAPICH2 supports MPI_THREAD_MULTIPLE by default. Could you please
try removing the "--enable-threads=multiple"  option in your config line.
Additionally, you could also disable affinity by setting the flag
MV2_ENABLE_AFFINITY=0. Please let us know if this helps.

Thanks,
Krishna
(www.cse.ohio-state.edu/~kandalla)



On Mon, Oct 22, 2012 at 9:18 PM, Brody Huval <brodyh at stanford.edu> wrote:

> Hi All,
>
> My MPI program spawns a number of instances, each with two threads, one to
> load data and one for computations. The data threads and computational
> threads only talk amongst themselves. Once I added in MPI_Send & Recv to
> the data thread (on a unique tag), the program runs fine when the
> computational thread is idle & not sending messages. However, once the
> computational thread begins its communications the program segfaults.
>
> I am using MPI_Init_thread(…,MPI_MULTIPLE_THREADS,...) and it provides the
> request of MPI_MULTIPLE_THREADS. I have also built the library with the
> following options.
>
> *Configuration*
> brodyh at deep0:~$ mpiname -a
> MVAPICH2 1.8 Mon Apr 30 14:56:40 EDT 2012 ch3:mrail
>
> Compilation
> CC: gcc    -DNDEBUG -DNVALGRIND -O2
> CXX: c++   -DNDEBUG -DNVALGRIND -O2
> F77: gfortran   -O2
> FC: gfortran   -O2
>
> Configuration
> --prefix=/scr/brodyh/local --enable-cuda --with-cuda=/usr/local/cuda
> --enable-threads=multiple
>
>
>
> Any idea what could be happening? Thanks for your time.
>
>
> Best,
> Brody Huval
>
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