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    1. USWesley Bland
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    1. COCan you share some example on how it works? I read the pdf you shared but it is not much clear how to use mpi_win* functions. I also saw http://mpi.deino.net/mpi_functions/MPI_Win_lock.html but it is not too much helpful either. I just need to share an `int` across processes any process can read/write on that integer. Also are there any access control mechanisms for this type of shared memory which MPI provides ? Thanks!
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    2. COTo share data across multiple processes with RMA, you'll need to create an MPI_Window using MPI_Win_allocate or MPI_Win_allocate_shared. Then you can use MPI_Put and MPI_Get to access the data. You'll need to add the synchronization functions MPI_Win_lock and MPI_Win_unlock around your data accesses to ensure accurate synchronization. I don't think I can post too many links here, but if you Google for "MPI RMA Tutorial", you should be able to find some slides that discuss how to use it.
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      1. USWesley Bland
    3. COOne thing to note is that the shared memory version of RMA is new to MPI-3 so if you're looking at tutorials and documentation, check the date to see if it's talking about distributed memory RMA (pre-version 2.0) or distributed and shared memory RMA (version 3.0). Version 3.0 of MPI was just published in September 2012 so it isn't ubiquitous yet. All of the old tutorials still apply, but you might need to add a few things to use shared memory.
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