[mvapich-discuss] MPI_THREAD_MULTIPLE not working

[Jonathan Perkins]

On Wed, Oct 16, 2013 at 10:24:09AM -0700, Justin Luitjens wrote:
> I am trying to get MPI_THREAD_MULTIPLE working in mvapich2-2.0a.  I have configured with the following options:
> 
> ./configure --prefix=/home/jluitjens/libs/mvapich/ --enable-threads=runtime --enable-cuda --enable-shared --with-cuda=/shared/apps/cuda/CUDA-v5.5.22

I recommend that you drop the --enable-threads option.

> 
> This configures and builds fine.  However, when I try a simple application I see that I do not get MPI_THREAD_MULTIPLE support.

Did you run with MV2_ENABLE_AFFINITY=0?  If not MPI_Init_thread will not
return MPI_THREAD_MULTIPLE.

> 
> #include <stdio.h>
> int main(int argc, char** argv) {
> 
>   int provided;
>   MPI_Init_thread(&argc,&argv,MPI_THREAD_MULTIPLE,&provided);
>   if(provided!=MPI_THREAD_MULTIPLE) {
>     printf("Error thread level requested: %d, provided: %d\n", MPI_THREAD_MULTIPLE,provided);
>    exit(0);
>   }
> }
> 
> I have also tried the configure option --enable-threads=multiple and that did not help.

This is expected, please see above.  Please let me know if this helps.

-- 
Jonathan Perkins
http://www.cse.ohio-state.edu/~perkinjo