Function asynchSendArray

quest/src/comm/comm_routines.cpp:248–266

void asynchSendArray(qcomp* send, qindex numElems, int pairRank) {
#if COMPILE_MPI

    // we will not track nor wait for the asynch send; instead, the caller will later comm_sync()
    MPI_Request nullReq = MPI_REQUEST_NULL;

    // divide the data into multiple messages
    auto [messageSize, numMessages] = dividePow2PayloadIntoMessages(numElems);

    // asynchronously send the uniquely-tagged messages
    for (qindex m=0; m<numMessages; m++) {
        int tag = static_cast<int>(m); // gauranteed int, but m*messageSize needs qindex
        MPI_Isend(&send[m*messageSize], messageSize, MPI_QCOMP, pairRank, tag, MPI_COMM_WORLD, &nullReq);
    }

#else
    error_commButEnvNotDistributed();
#endif
}


void receiveArray(qcomp* dest, qindex numElems, int pairRank) {