Thats was almost 15 years ago :) from the time we used RCS - and didn't maintain commit messages. I think its probably more because mpiuni doesn't support more than 1 communicator and attributes are stashed in a global structure [not per communicator]. Perhaps mpiuni needs fixing.. Satish On Mon, 16 Jul 2012, Jed Brown wrote:

Satish, what was the rationale behind this commit? I can't think of an excuse for making them be literally the same.

On Mon, Jul 16, 2012 at 11:11 AM, Satish Balay <[email protected]> wrote:

...

Actually for np=1 MPI_COMM_SELF==MPI_COMM_WORLD.

mpi.h was changed to reflect this - but mpif.h was not.

Satish

---------- balay@petsc:~/Petsc-historic/src/sys/src/mpiuni $ rcsdiff -r1.52 -r1.53 mpi.h =================================================================== RCS file: RCS/mpi.h,v retrieving revision 1.52 retrieving revision 1.53 diff -r1.52 -r1.53 1c1 < /* $Id: mpi.h,v 1.52 1997/07/28 21:41:02 balay Exp $ */ ---

...

/* $Id: mpi.h,v 1.53 1997/08/21 01:06:19 balay Exp $ */ 22c22 < #define MPI_COMM_SELF 2

---

...

#define MPI_COMM_SELF MPI_COMM_WORLD 427c427 < (MPIUNI_TMP = (void *) (comm), \

---

...

(*(newcomm) = (comm), \

429d428 < MPIUNI_TMP = (void *) (newcomm), \