Hi, have somebody compiled the boost_1.48 with a mvapich compiler? The test from boost mpi get started, which tests the mpi installation works fine. Than i installed the whole library, with adding using mpi : path_to/mpiCC ; into the user-config.jam After this i run ./bootstrap --prefix=where_to_install and ./bjam --prefix=where_to_install install My next step was to test the installation with the first program code from the boost mpi tutorial. ("I am process " << world.rank() << " of " << world.size()) But i get a deadlock in the line mpi::environment env(argc, argv); Can somebody explain me why? or where my failure is? Regards Cornelius