ibv: NPAM Long via RDMA#11
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This commit implements a RDMA protocol for GASNet-allocated NPAM Long, where previously only a "packed" protocol was available. The new environment variable `GASNET_PACKEDLONG_ALLOC_LIMIT` is added to control the protocol switch point (default is to match the value of `GASNET_PACKEDLONG_LIMIT`). Relative to the packed protocol, this saves the `memcpy()` at the target at the expense of adding a second ibv-level message injection at the initiator.
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This PR is DRAFT
This is a rebase of the work in https://bitbucket.org/berkeleylab/gasnet/pull-requests/437.
It has passed minimal re-testing, but there is no current performance data.
Before this work would ready for review, more complete correctness and performance testing is needed.
ibv: NPAM Long via RDMA
This commit implements a RDMA protocol for GASNet-allocated NPAM Long, where previously only a "packed" protocol was available. The new environment variable
GASNET_PACKEDLONG_ALLOC_LIMITis added to control the protocol switch point (default is to match the value ofGASNET_PACKEDLONG_LIMIT).Relative to the packed protocol, this saves the
memcpy()at the target at the expense of adding a second ibv-level message injection at the initiator.