MPICH通信失败 [英] MPICH communication failed

问题描述

我有一个简单的MPICH程序，其中的进程发送&

我已设置为2个相同的虚拟机，并确保网络正常运行。我已经在两台机器上测试了一个简单的MPICH程序，并且运行良好。
当我尝试在上述程序之类的不同机器上的进程之间进行通信时，就会出现问题。我收到以下错误：

I have a simple MPICH program in which processes send & receive messages from each other in a Ring order.
I've setup to 2 identical virtual machine, and made sure network is working fine. I've tested a simple MPICH program both machines and it works fine. The problem arises when I try to communicate between processes on different machines like the above program. I'm getting the following error:

MPI_Send中的致命错误：进程失败，错误堆栈：

MPI_Send（171）......：MPI_Send（buf = 0xbfed8c08，count = 1，MPI_INT，dest = 1，

tag = 1，MPI_COMM_WORLD）失败

MPID_nem_tcp_connpoll（1826）：通讯错误，等级1：连接被拒绝

Fatal error in MPI_Send: A process has failed, error stack:
MPI_Send(171)...............: MPI_Send(buf=0xbfed8c08, count=1, MPI_INT, dest=1,
tag=1, MPI_COMM_WORLD) failed
MPID_nem_tcp_connpoll(1826): Communication error with rank 1: Connection refused

• SSH是无密码的&


• / etc / hosts 配置正确。


• 防火墙


• 已配置的NFS客户端/服务器并在它们之间共享目录。
（根据此）

• 同时尝试了MPICH和带有Hydra的OpenMPI


• SSH is passwordless & works fine on both sides.
• /etc/hosts is configured properly.
• Firewall is disabled on both machines.
• Configured NFS Client/Server and shared a directory between them. (According to this)
• Tried both MPICH & OpenMPI with Hydra

推荐答案

这就是我所做的，而且有效！

Here what i did, And it works!

使用源代码（压缩包）安装在以下软件包中

Installed following package using source code (tarball)

hydra 
openmpi

已创建的主机文件（均为节点）

Created hosts file (both node)

# cat /home/spatel/mpi/hydra/hosts
node1
node2 

在.bashrc中（两个节点上）设置变量

Set variable in .bashrc on (both node)

echo HYDRA_HOST_FILE=/home/spatel/mpi/hydra/hosts >> ~/.bashrc

使用HelloWorld MPI程序在单个节点上运行。

Use HelloWorld MPI program to run on single node.

node1# /home/spatel/mpi/hydra/bin/mpiexec -np 1 /home/spatel/mpi/mpi_hello_world
Hello world from processor node1.example.com, rank 0 out of 1 processors

在使用 -machinefile 选项 -np 的多节点是处理器数量

Run on multiple node using -machinefile option -np is number of processor

node1# /home/spatel/mpi/hydra/bin/mpiexec -np 4 -machinefile /home/spatel/mpi/hydra/hosts /home/spatel/mpi/mpi_hello_world
Hello world from processor node1.example.com, rank 0 out of 1 processors
Hello world from processor node2.example.com, rank 0 out of 1 processors
Hello world from processor node1.example.com, rank 0 out of 1 processors
Hello world from processor node2.example.com, rank 0 out of 1 processors

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