MPI发送recv输入参数

Question

我对这部分代码有些问题（我把它简化得更清楚了）。

//p is the number of processor (we suppose 2)
//vett is the vector who contains the elements to send
//disp is a vector whose elements are the index of the first element to send
//elem is a vector whose elements are the number of elements to send
//local_v is the destination vector (of dimension elem[rank])
//local_n is the number of elements that have to arrive (=elem[rank])

在我的情况下，循环只执行一次

for(unsigned int i = 1; i < p; i++){
    if(rank==0){
        MPI_Send(&vett[disp[i]], elem[i], MPI_INT, i, 0, MPI_COMM_WORLD);
    }else{
        MPI_Recv(&local_v, local_n, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
    }
}

Processor1发送给另一个（在这种情况下只有处理器2）。我不确定我是否正确使用MPI_Send，特别是我不确定第一个输入参数是否正确...

Answer 1

在MPI_Recv接收缓冲区后缺少[0]，这就是整行：

MPI_Recv(&local_v[0], local_n, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);