非阻塞實現節點間的迴圈訊息傳遞

一、題目要求

MPI非阻塞方式實現節點間的迴圈訊息傳遞

二、思路

使用MPI_Isend、MPI_Irecv和MPI_Wait等函式；

三、我的程式碼

#include <stdio.h>
#include <string.h>
#include "mpi.h"

int main(int argc, char *argv[])
{
    char sendmsg[100] = "asdfasdf";
    char recvmsg[100] = "";

    int myid, numprocs;

    MPI_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &myid);
    MPI_Comm_size(MPI_COMM_WORLD, &numprocs);

    int
 
 dest = myid+1;
    int source = myid-1;

    if(myid == 0)
        source = numprocs-1;
    if(myid == numprocs-1)
        dest = 0;

    //傳送
    MPI_Request request1;
    MPI_Status status1;

    MPI_Isend(sendmsg, strlen(sendmsg), MPI_CHAR, dest, 99, MPI_COMM_WORLD, &request1);


    //接收
    MPI_Request request2;
    MPI_Status status2;

    MPI_Irecv(recvmsg, 100
 
, MPI_CHAR, source, 99, MPI_COMM_WORLD, &request2);

    MPI_Wait(&request2, &status2);

    //列印
    // printf("has send from %d to %d\n", myid, dest);
    // printf("has recv from %d to %d\n", source, myid);
    // printf("%s", recvmsg);

    return 0;
}