[MPICH] Changing the comm size at runtime

[Patrick Gräbel]

I just have tested it with VC2005: the singleton init works, no  
mpiexec and no env vars needed! connecting/accepting communication  
works as well as a Bcast and a call to Allgather. I don't know why it  
does not work with Cygwin/gcc, but the important thing for me is VC2005.

Thanks
Patrick

Quoting Anthony Chan <chan at mcs.anl.gov>:

>
> Can you try adding these lines right after MPI_Init() ?
>
>     MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, &usize, &aflag);
>
> and see if the singleton init works.
>
> A.Chan
>