Check for "handshake" in MPI? -

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is there way check whether non-blocking receive posted (for given source , tag), before initiating mpi_send? i've got situation senders , receivers both don't know send / receive from. idea first post open irecv on chosen receivers. senders check whether rank has posted receive, , send if true (continue otherwise). after sends successful, receivers cancel outstanding irecvs.

  • this works collective (on mpi_comm_world) array broadcast; i'm wondering if there different way

  • i imagine in reverse, mpi_isend , mpi_probe. in case though i'm worried happens unreceived send buffers (and have heard mpi_cancel bad news sends)

thanks suggestions.

you can perform mpi_irecv different tag of data transfer, using source mpi_any. using blocking mpi_recv trick. once message (mpi_test's flag==1), can check actual source reading mpi_status.mpi_source (not available if status parameter mpi_status_ignore).

if don't explicitly require transfer must synchronized, using one-sided communication more efficient (the sender puts data on receiver.

additional info: introducing one-sided communication


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