[mvapich-discuss] MPI3

[Dhabaleswar Panda]

Hi Jens,

Thanks for your interest in the MPI-3 RMA feature. The next MVAPICH2 
release will have support for some of the MPI-3 features. However, the 
MPI-3 RMA support you are asking for will not be available. It will be 
available in later releases.

Thanks,

DK



On Wed, 17 Oct 2012, Jens Glaser wrote:

> Hi,
>
> I am curious whether the MPI-3 extensions to one-sided communication are presently or will be implemented in MVAPICH2.
>
> In particular, I think I have a need for dynamic windows (MPI_Win_create_dynamic, Win_attach, Win_detach),  since I want to copy multiple send buffers to the same buffer on the receiving
> side, and the offsets are only known on the sending side. However, the buffers I am planning to use as the RMA window
> are not static during the runtime of the application, they can be reallocated. The static MPI-2 solution for this, MPI_Win_create requires collective communication on the whole communicator,
> and it would be slow with a large number of processors if it is performed every communication step. On the other hand, the group of processors effectively required to sync in a communication step is only a subset of the whole communicator, namely the cell neighbors of a domain-decomposition scheme. So if MPI_win_attach/detach would be lightweight operations to attach/detach the receive buffer, and if they could be performed in every communication step, I think the proposed MPI3 extensions would very likely solve my problem.
>
> I saw the paper "Design and implementation of key proposed MPI-3 one-sided communication semantics on infiniband" regarding MVAPICH2 and I am wondering
> whether the implementation described therein is already available, or at least, available for testing purposes.
>
> Thanks,
> Jens.
>
>
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