来自未知来源的MPI接收 [英] MPI recv from an unknown source

问题描述

我正在MPI中实现一个程序，在该程序中，主进程(rank = 0)应该能够接收来自其他进程的请求，这些进程请求仅由根知道的变量的值. 如果我使MPI_Recv(...)的等级为0，则必须指定将请求发送到根目录的进程的等级，但是由于进程未按1,2,3的顺序运行，所以我无法控制它的等级. ，.... 如何从任何级别接收请求，并使用发送过程的编号向它发送必要的信息?

I am implementing in MPI a program in which the main process (with rank=0) should be able to receive requests from the other processes who ask for values of variables that are only known by the root. If I make MPI_Recv(...) by the rank 0, I have to specify the rank of the process which sends request to the root, but i cannot control that since the processes don't run in the order 1,2,3,.... How can I receive the request from any rank and use the number of the emitting process to send it the necessary information?

推荐答案

这假定您正在使用C.C++和Fortran中有类似的概念.您只需将MPI_ANY_SOURCE指定为MPI_recv()中的源.状态结构包含消息的实际来源.

This assumes you are using C. There are similar concepts in C++ and Fortran. You would just specify MPI_ANY_SOURCE as the source in the MPI_recv(). The status struct contains the actual source of the message.

int buf[32];
MPI_Status status;
// receive message from any source
MPI_recv(buf, 32, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
int replybuf[];
// send reply back to sender of the message received above
MPI_send(buf, 32, MPI_INT, status.MPI_SOURCE, tag, MPI_COMM_WORLD);

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