On Dec 15, 2009, at 10:30 AM, Wei-keng Liao wrote: > such as MPI_SUCCESS, which may be defined as constant 1. Section 8.4, page 271 of the MPI-2.1 Standard requires that (MPI_SUCCESS=0). I don't have my 2.2 doc pulled up, but it surely says the same thing in basically the same place. -Dave