On Oct 21, 2009, at 5:43 PM, Lisandro Dalcin wrote:
Currently (trunk, just svn update'd), the following call fails (because of the ranks=NULL pointer)MPI_Group_{incl|excl}(group, 0, NULL, &newgroup)
Agreed; bug. I think there's a little wiggle room in the spec wording that it may or may not be an error, but I think that it's certainly more social to accept NULL if n==0.
BTW, MPI_Group_translate_ranks() has similar issues... Provided that Open MPI accept the combination (int_array_size=0, int_array_ptr=NULL) in other calls, I think it should also accept the NULL's in the calls above... What do you think?
The spec isn't quite a clear for MPI_Group_translate_ranks as it is for MPI_Group_incl|excl (e.g., those both have defined behavior for when n==0), but I think it falls into "it's more social" category to just do nothing and return MPI_SUCCESS when n==0.
I'll fix both -- thanks! -- Jeff Squyres jsquy...@cisco.com
