Hi guys, I wonder why we stopped using Wiki for the bulky stuff. Best regards. Alexander -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Christian Siebert Sent: Wednesday, October 15, 2008 4:03 PM To: MPI-3 Collective Subgroup Discussions Subject: Re: [mpi3-coll] Non-blocking Collectives Proposal Draft @Torsten: Thanks a lot for this first draft! I tried to make some useful comments and attached the results to this mail (sorry, I can't comment PDFs so I did it the "old inconvenient way"). @Working Group (something to discuss): 1) The MPI-2.1 document has 127 occurrences of "nonblocking" and only 8 occurrences of "non-blocking". What would be the correct term? Should we try to be more consistent? 2) Clarification of MPI_Request_free() for requests from non-blocking collective operations. 3) Better definition/description for "matching" (there is nothing like "at the same time" -> logical order?). 4) Define "levels of progression"? To be queried (e.g., for "Synchronous Progress" MPI_Tests are needed for performance, but for "Asynchronous Progress" they would only add unnecessary overhead)? UP >= AP >= SP? 5) "Unexpected Progress" => "buffered" collectives? 6) NBC gives several possible ways for optimizations. With this "General advice to implementers" we stick to only one, and might prevent others. Can we already fix a decision for optimization strategies at this stage? Should we fix it at all? 7) Should there be a concrete code example in the proposal (e.g. an implementation of this double buffering example)? Hope this isn't too much for now. Best regards, Christian Torsten Hoefler wrote:

Hello Working Group, I finished a first draft of our non-blocking collectives proposal. Please read it carefully and send comments to me or the list (e.g., marked-up pdf documents).

The draft is attached to this mail.

All the Best, Torsten

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