[Mpi3-rma] Alternative Proposal for Shared Memory Support

[Torsten Hoefler]

On Tue, Mar 15, 2011 at 09:48:40PM -0500, Rajeev Thakur wrote:
> Also, at the last meeting we had trouble defining the MPI_SHM_Fence
> function. Dave said we won't be able to define it portably for all
> processor architectures wrt memory orderings etc. Someone else pointed
> out that, in Fortran, code can be moved around it. Those issues won't
> go away by effectively renaming MPI_SHM_Fence to MPI_Win_flush. (These
> issues are wrt direct loads/stores to shared memory.)
I know, those issues are the same for a fast implementation on a shared
memory system (one that doesn't do a membar in every put/get/...). So I
think this issue is orthogonal and independent of the interface.

Best,
  Torsten

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Torsten Hoefler         | Performance Modeling and Simulation Lead
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