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epoch's control data could overwrite the previous epoch's data because we were reusing data structures between PW and SC. Instead, we now have explicit post_msg and complete_msg counters for completion. refs trac:354 * Only register the rdma osc callback once, as it turns out that some btls (MX) do somethng more than update a table during the register call, and each register call sucks up valuable fragments... This commit was SVN r11745. The following Trac tickets were found above: Ticket 354 --> https://svn.open-mpi.org/trac/ompi/ticket/354