use MPI-3 RMA features

[pmrsbot]

Reported by jhammond on 14 May 2013 15:51 UTC

• ARMCI_Rmw should use MPI_Fetch_and_op.
• request-based operations in MPI-3 RMA can be used to implement explicit-handle nonblocking ARMCI ops.
• MPI-3 RMA separates local and remote completion now, just like ARMCI does. We should use flush_local to achieve the same.
• ARMCI will benefit greatly from the use of win_lock_all and flush_local/flush/flushall-based completion.
• MPI_Compare_and_swap may or may not be a good idea for ARMCI mutexes. (Jim will likely say that spinning across the network is bad, but if we know contention is going to be low...)

[pmrsbot]

Modified by jhammond on 27 May 2013 01:51 UTC

[pmrsbot]

Comment by jhammond on 22 Dec 2013 20:00 UTC Resolved in http://git.mpich.org/armci-mpi.git/commit/127f8048b0320374c431c672724ca36a4e7fa001 and other commits.