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MPI without blocking send / recv

I am curious about the lack of this feature in MPI:

MPI_Isendrecv( ... );

ie, non-blocking transmission and reception, can someone tell me the reason for its absence?

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I believe that it MPI_SENDRECVexists as a convenience for programmers who want to use blocking semantics, but it is necessary to implement a switch operation. If you like non-blocking semantics, you should just use existing MPI_ISENDand MPI_IRECV.

Interestingly, MPI-3 will add non-blocking teams (for example, MPI_IBARRIER), but still no MPI_ISENDRECV(see http://meetings.mpi-forum.org/draft_standard/mpi3.0_draft_2.pdf ).

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