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What kind of quiscence are you thinking of? It seems to me that applications will simply need to ensure that either no messages are in-flight at the time of the checkpoint or that all such messages have been logged appropriately by the application.

In an application-directed C/R system that would be the ideal MPI quiescence.

But that is something that the application is responsible for. Was there anything that MPI would be responsible for? Greg Bronevetsky Post-Doctoral Researcher 1028 Building 451 Lawrence Livermore National Lab (925) 424-5756 [email protected]