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- nonBlocking: receive before send - nonBlocking: wait for receive requests, process and then wait for other requests. Can be extended to use polling... - the 'fake' send (to self) now send copies into recv buffers instead of send buffers. This provides a clear separation of send and receive fields - avoid unnecessary reallocations with PtrList of send/recv buffers - remove outer looping for accessAndFlip and pass target field as parameter for inner looping instead ENH: refine mapDistribute send/recv requests handling - separate send/recv requests for finer control - receive does not need access to PtrList of sendBuffers, since the send-to-self now uses the recvBuffers
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