This limit is controlled by several MCA variables. Contiguous segments
larger than the btl_openib_eager_limit will use the RDMA protocol (Get) if
mpi_leave_pinned is set and the RDMA RNDV (Put) protocol
otherwise. Both of these protocol pin the user buffer on both sides.
On Fri, May 23, 2014 at 04:39:36PM -0500, Siddhartha Jana wrote:
> Is my understanding correct?
> While servicing MPI_Send using eager protocol over openib, there is a
> data-size threshold below which it is preferred to copy the contents of
> the user-buffer to a pre-pinned buffer instead of directly pinning down
> the user-buffer. If this is correct, how does one determine this
> As always, thanks for the help
> devel mailing list
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> Link to this post: http://www.open-mpi.org/community/lists/devel/2014/05/14837.php
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