[Boost-users] [mpi] enviroment constructor different from MPI_Init

Subject: [Boost-users] [mpi] enviroment constructor different from MPI_Init
From: alfC (alfredo.correa_at_[hidden])
Date: 2009-09-15 14:12:42

I am using MPI in combination with BLACS and apparently it works with
MPI_Init but not with boost.MPI

when I use

#include "blacs.h"
int main(int argc, char* argv[]) {
        MPI_Init(&argc,&argv);
         int nprocs=0;
        int mype=0;
        Cblacs_pinfo( &mype, &nprocs ); // overwrites the pointee, that is
how Cblacs_pinfo works
        std::cout<<mype<<" "<<nprocs<<std::endl;

the program output (correctly): "0 1"

But when I use

        boost::mpi::environment env(argc, argv); //instead of MPI_Init(argc,
argv);

the programs outputs (incorrectly):  "0 -1".

The point being that apparently boost::mpi::environment is not
equivalent to MPI_Init/MPI_Finalize.

Any idea of what is difference between MPI_Init and
boost::mpi::environment?

Thank you,
Alfredo