2017 09 27

Attendees

• Intel - Wesley
• Argonne - Ken, Yanfei
• UTK - Aurelien
• ORNL - Geoffroy

Error Handlers

• Wesley made edits based on the feedback from the face-to-face.
  • There are still a couple of very minor edits that need to be made

Process Fault Tolerance

• Is it possible to use ULFM and Reinit at the same time?
  • Not sure how they can be composed (even if the smaller communicator used ULFM) because the error handler for the larger communicator is still likely to be triggered after a process failure, which would trigger reinit.
• We don't think it's a problem to use error handlers, but if using MPI_ERRORS_REINIT, it would need to be consistent across all communicators.
  • We still like using error handlers better than an API call
    • It doesn't create a new API interface
    • Changing the error handler is already required for process fault tolerance anyway.

TODO Items

• Aurelien - Write first draft of ULFM composability/recovery advice to have libraries repair MPI in one place.
• Aurelien - Merge MPI_COMM_ISHRINK branch
• Aurelien - Go back over other ULFM branches so we can discuss them next time
• Wesley - Go back through ULFM RMA discussions to see what we need to do (if anything to move forward).
• Wesley - Improve slides for catastrophic errors to include example use cases