[mpiwg-hybridpm] Hybrid telecon fiasco

[Balaji, Pavan]

Thanks, I’ve uploaded it on the wiki.

https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/MPI3Hybrid/notes-2014-04-07

  — Pavan

On Apr 7, 2014, at 12:09 PM, Jim Dinan <james.dinan at gmail.com> wrote:

> Little did you know, you'd still be holding these meetings 4 years later.  :)
> 
> Meeting notes:
> 
> In attendance: Dan and Jim
> 
> Open items for endpoints:
> 
> ** Interface for freeing endpoints communicators:
> 
> Current, we use MPI_Comm_free to free endpoints communicators, and we extend the MPI_Comm_free semantics to allows one thread to call this routine for each endpoint.  If we didn't have this extension to Comm_free, you can create endpoints, e.g. in MPI_THREAD_SERIALIZED mode, but you can't free them.  The Forum dislikes this new semantic and as suggested that we remove it.
> 
> Dan suggested a third approach where we leave the Comm_free semantic unchanged and add a new function, MPI_Comm_free_endpoints(MPI_Comm comm_handles[], int my_num_ep), that has symmetry with Comm_create_endpoints.  An endpoints communicator can be freed with either Comm_free or Comm_free_endpoints.  They differ in their concurrency requirement.
> 
> ** MPI_ALIASED result from comm_compare:
> 
> We need to define aliased, on page 237 for comm_compare.  We may also need to define it for group_compare.  Here's suggested text for comm_compare (changes highlighted):
> MPI_IDENT results if and only if comm1 and comm2 are handles for the same object (same rank, identical groups, and same contexts). MPI_ALIASED results if comm1 and comm2 are handles for different ranks in the same communicator (different ranks, identical groups, and same contexts). MPI_CONGRUENT results if the underlying groups are identical in constituents and rank order; these communicators differ only by context. MPI_SIMILAR results if the group members of both communicators are the same but the rank order differs. MPI_UNEQUAL results otherwise. 
> 
>  ~Jim.
> 
> 
> On Mon, Apr 7, 2014 at 12:24 PM, Balaji, Pavan <balaji at anl.gov> wrote:
> Folks,
> 
> We were supposed to have a hybrid telecon today.  Unfortunately, when I created my calendar invite 4 years ago, I decided that March 2014 was a great end date for the telecons and didn’t have it show up on my calendar.
> 
> Jim and Dan met.  Jim will email out notes.
> 
> Sorry about that.
> 
>   — Pavan
> 
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