Linux openmpi python超过3个副本

我运行了一个包含3个以上进程的简单mpi python程序。 例如：

mpiexec -host master,w1,w2,w3 python code.py

显示这一点有一些错误

ssh: Could not resolve hostname w3: Name or service not known
ORTE was unable to reliably start one or more daemons.

This usually is caused by:

* not finding the required libraries and/or binaries on
  one or more nodes. Please check your PATH and LD_LIBRARY_PATH
  settings, or configure OMPI with --enable-orterun-prefix-by-default

* lack of authority to execute on one or more specified nodes.
  Please verify your allocation and authorities.

* the inability to write startup files into /tmp (--tmpdir/orte_tmpdir_base).
  Please check with your sys admin to determine the correct location to use.

*  compilation of the orted with dynamic libraries when static are required
  (e.g., on Cray). Please check your configure cmd line and consider using
  one of the contrib/platform definitions for your system type.

* an inability to create a connection back to mpirun due to a
  lack of common network interfaces and/or no route found between
  them. Please check network connectivity (including firewalls
  and network routing requirements).

但是，如果我使用w1、w2、w3中的任意两个运行程序，它就可以工作。 例：

这就是代码

 import random
 import numpy as np
 from mpi4py import MPI

 comm = MPI.COMM_WORLD
 rank = comm.rank
 size = comm.size

 if rank ==0:
 print rank, 'worker'
 else:
 print rank, 'worker'

---

我怎样才能解决它？谢谢。

根据输出：

ssh:无法解析主机名w3:名称或服务未知

，问题很明显：

主机名

w3

无法由主节点（计算机）识别。 您可以将

名称

-

ip

映射添加到

/etc/hosts

，格式为

ip名称

。 例如：

255.255.255.0\u名称

 import random
 import numpy as np
 from mpi4py import MPI

 comm = MPI.COMM_WORLD
 rank = comm.rank
 size = comm.size

 if rank ==0:
 print rank, 'worker'
 else:
 print rank, 'worker'