[ofiwg] proposal to add a new completion semantic

Kenneth Raffenetti raffenet at mcs.anl.gov
Thu Aug 2 15:31:52 PDT 2018

MPI synchronous send does not guarantee data placement into the target 
buffer. It only guarantees that the recv operation on the target side 
has been posted and matched. The data can still come later.


On 08/02/2018 05:20 PM, Hefty, Sean wrote:
> Based on discussion with some MPI developers, I'm proposing that we introduce a new completion semantic to libfabric.  This specifically targets support for the MPI synchronous send operation.
> The proposed semantic is:
> : Indicates that a completion should be generated only after the operation
>    has been placed into the application specified buffer.  Operations using
>    this completion semantic are dependent on the application at the target
>    claiming the message or results.  As a result, match complete may involve
>    additional provider level acknowledgements or lengthy delays.  However, this
>    completion model enables peer applications to synchronize their execution.
> The associated PR is:
> https://github.com/ofiwg/libfabric/pull/4303
> Note that the PR consolidates and expands the completion levels supported by libfabric into the fi_cq man page.
> - Sean
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