On Jul 28, 2007, at 6:27 AM, Jeff Squyres wrote:
On Jul 27, 2007, at 8:27 PM, Lisandro Dalcin wrote:
MPI_WIN_GET_GROUP returns a duplicate of the group of the
communicator
used to create the window. associated with win. The group is returned
in group.
Well, it seems OMPI (v1.2 svn) is not returning a duplicate,
comparing
the handles with == C operator gives true. Can you confirm this?
Should the word 'duplicate' be interpreted as 'a new reference to' ?
I would tend to agree with this wording; I think we're doing the
wrong thing.
Brian -- what do you think?
In my opinion, we conform to the standard. We reference count the
group, it's incremented on call to MPI_WIN_GROUP, and you can safely
call MPI_GROUP_FREE on the group returned from MPI_WIN_GROUP. Groups
are essentially immutable, so there's no way I can think of that we
violate the MPI standard.
Others are, of course, free to disagree with me.
Brian
--
Brian W. Barrett
Networking Team, CCS-1
Los Alamos National Laboratory
