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2021 10 25 webex j ftwg
#10/25/21 webex notes
Attending: Howard Pritchard, Thomas Hines, Dan Holmes, Isaias Urena, Trupeshkumar Patel, Martin Schreiber, Martin Schulz, Wesley Bland, Aurelian Bouteiller, Grace Nansamba
- Discuss current activities of both working groups
Aurelian presents a slide set covering FT items in MPI 4.0, review of ULFM elements (run through recovery). Several slides devoted to handling of MPI_ANY_SOURCE case. Going forward, thinking of a MPI_Session_revoke, use MPI_Comm_Create_from_group to handle shring/replace recovery modes. Concensus-like meaning for comm create from group? Variadic psets - generation type notion being considered by sessions WG.
Dan describes Sessions WG recent work on growing/shrinking and approaches to figuring out deltas in available process sets. The session diff notion.
Aurelian would like to retain notion of an communicator shrink for those apps who don't want to use sessions model.
Discuss the asynchronous notification mechanism further - sessions WG has also discussed this in the context of RT notifications. See slide 22 in the presentation. Do we want to mandate rapid response? Seems like it would be good to introduce this concept in a more generic way than just focused on error handling.
Dan does a quick review of what Sessions WG has been doing recently.