Torsten: Re:

Our first teleconference will be held on Tuesday, 2/12/08 at noon (12:00pm). Dial-in details:

Conf Id: 11487 Date: 2/12/2008 Begin Time: 11:55:00 AM Eastern Time (US & Canada) End Time: 2:15:00 PM Eastern Time (US & Canada)

I will not be able to make this call since I will be at meeting in San Diego then. Your agenda looks pretty good. I am particularly interested in extensions that support situations when the overhead of creating separate communicators for each different collective grouping may be too high, which I would broadly characterize as either small group or impromptu collectives. I think your topological collectives would serve as one example. Perhaps sparse collectives would also although I am not sure what that means. If someone could take detailed notes, that would be great! Thanks, Bronis

Phone Number: (812) 856-3600 Participant PIN: 000403#

The goal for this meeting will be to firm up the areas of activity that have been discussed for MPI3 collectives. In particular, we would like to get consensus from our group on our initial list of areas and also some volunteers for leaders and participants in each topic.

We will also begin discussions of those areas for which some proposals have already been made. Attached is a tentative agenda for this call.

Agenda: 1) Discuss the tentative Agenda (Andrew)

2) Non-blocking Collective Operations (Torsten) a) Discuss Importance of Tags b) Discuss pro/con of multiple mutstanding Collectives at a single Communicator c) Discuss the MPI-Forum Approach (Colls in a Thread) d) Discuss matching Semantics (Blocking and Non-blocking) e) Request Freeing and Cancellation Issues f) Progression (let's at least mention it ;)

3) Topological Collectives (Torsten) a) Discussing Extensions of the Current Proposal b) Comparison to Alltoallv (genericity?) c) Scalability Issues with Graph Topologies

4) Sparse Collective Communication (Andrew)

5) New Collective Operations (Jesper?)

6) Persistent Collectives (Jesper?)

7) Modularity of Extensions

Best, Andrew Lumsdaine and Torsten Hoefler

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