I have updated the Quiescence Interface proposal on the wiki: https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/Quiescence I am interested in questions and comments from the group regarding the interface, and use-cases. The primary use-case is for application initiated checkpoint/restart, but the semantics of the proposed API likely also open doors to other use-cases. Let me know what you think. Cheers, Josh