Here is my test program ====== #include "mpi.h" #include <stdio.h> #include <stdlib.h> #include <sys/time.h> typedef unsigned char byte; int main(int argc, char *argv[]){ MPI_Init(&argc, &argv); int rank,size; MPI_Comm_size(MPI_COMM_WORLD, &size); MPI_Comm_rank(MPI_COMM_WORLD, &rank); byte buf[10][10]; MPI_Request req[10]; MPI_Status stat[10]; int outcount; int array_of_indices[10]; int i; if(rank==0) { for(i =0; i< 10;i++){ MPI_Isend(buf[i], 10, MPI_BYTE, 1, 123, MPI_COMM_WORLD, &req[i]); } printf("post send\n"); MPI_Waitall(10, req, stat); printf("send over\n"); }else { for(i=0; i< 10;i++){ MPI_Irecv(buf[i], 10, MPI_BYTE, 0, 123, MPI_COMM_WORLD, &req[i]); } printf("post recv\n"); for (i=0;i<10;i++){ MPI_Waitsome(10, req, &outcount, array_of_indices, stat); printf("%d index %d\n", outcount, array_of_indices[0]); } } MPI_Finalize(); } ====== get the result like this ====== $ mpirun -n 2 ./tests post send send over post recv 1 index 0 1 index 1 1 index 2 1 index 3 1 index 4 1 index 5 1 index 6 1 index 7 1 index 8 1 index 9 ====== I think I should get some completed receive connection, not just 1. _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss