MPI_Barrier()在小型群集上不起作用 [英] MPI_Barrier() does not work on a small cluster

问题描述

我想在程序中使用MPI_Barrier()，但是有一些致命错误.

I want to use MPI_Barrier() in my programme, but there are some fatal errors.

这是我的代码:

  1 #include <stdio.h>
  2 #include "mpi.h"
  3 
  4 int main(int argc, char* argv[]){
  5         int rank, size;
  6 
  7         MPI_Init(&argc, &argv);
  8         MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  9         MPI_Comm_size(MPI_COMM_WORLD, &size);
 10         printf("Hello, world, I am %d of %d. \n", rank, size);
 11         MPI_Barrier(MPI_COMM_WORLD);
 12         MPI_Finalize();
 13 
 14         return 0;
 15 }

这是输出:

Hello, world, I am 0 of 2. 
Hello, world, I am 1 of 2. 
Fatal error in PMPI_Barrier: Other MPI error, error stack:
PMPI_Barrier(425).........: MPI_Barrier(MPI_COMM_WORLD) failed
MPIR_Barrier_impl(331)....: Failure during collective
MPIR_Barrier_impl(313)....: 
MPIR_Barrier_intra(83)....: 
dequeue_and_set_error(596): Communication error with rank 0

有什么建议吗?

感谢和问候！

推荐答案

这通常反映出某种配置错误-主机或用户名配置在节点之间不一致，或者存在某种防火墙阻止了某些端口. MPICH2 FAQ 讨论了一些要查找的地方.

This generally reflects some sort of configuration error -- either host or username configurations are not consistent across nodes, or there is some sort of firewall blocking some ports. The MPICH2 FAQ discusses some places to look.

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