MPI_Op and MPI_Request will involve the pointer to
function, which is not allowed in Java also. But we think this problem
could be resolve by invoke a Java class and invoke its method
automatically.
> 1, use mpirun to invoke Java
interpreter will core dump or even hang the processes. We already
reflect this problem to MPI implementation authors. Hopefully they will
solve this problem soon. Currently, Bryan Carpenter modify part of the
MPI source code and it works quite good (but will still core dump when
np > 3). Thanks to his patch, we can have further progress in
this implementaion.