Hi I've got a bit of an odd bug here. I've been playing around with MPI process management routines and I notied the following behavior with openmpi-1.0.1:
Two processes (a and b), linked with ompi, but started independently (no mpiexec, just started the programs directly). - a and b: call MPI_Init - a: open a unix network socket on 'fd' - b: connect to a's socket - a and b: call MPI_Comm_join over 'fd' - a and b: call MPI_Intercomm_merge, get intracommunicator. These steps all work fine. Now the odd part: a and b call MPI_Comm_rank and MPI_Comm_size over the intracommunicator. Both (correctly) think Comm_size is two, but both also think (incorrectly) that they are rank 1. ==rob -- Rob Latham Mathematics and Computer Science Division A215 0178 EA2D B059 8CDF Argonne National Labs, IL USA B29D F333 664A 4280 315B
