我想通过以下代码,在不同的Google云计算实例上使用MPI显示“hello world”:
from mpi4py import MPI
size = MPI.COMM_WORLD.Get_size()
rank = MPI.COMM_WORLD.Get_rank()
name = MPI.Get_processor_name()
print("Hello, World! I am process/rank {} of {} on {}.\n".format(rank, size, name))
问题在于,尽管我可以在这些实例之间轻松进行ssh连接,但我在尝试运行脚本时却收到了权限被拒绝的错误消息。我使用以下命令来调用我的脚本:
mpirun --host localhost,instance_1,instance_2 python hello_world.py
.
然后我收到以下错误消息:
Permission denied (publickey).
--------------------------------------------------------------------------
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).
--------------------------------------------------------------------------
附加信息:
- 我在所有节点上安装了open-MPI
- 我使用gcloud从每个实例登录到每个实例,使Google自动设置我的所有ssh密钥
- 实例类型:n1-standard-1
- 实例操作系统:Linux Debian(默认)
谢谢你的帮助 :-)
新信息:
(感谢 @Zulan 指出我应该编辑以前的帖子而不是创建新答案来获取新信息)
所以,我尝试用mpich代替openmpi做同样的事情。然而,我遇到了类似的错误消息。
命令:
mpirun --host localhost,instance_1,instance_2 python hello_world.py
错误消息:
Host key verification failed.
我可以在我的两个实例之间进行ssh连接,而通过gcloud命令,ssh密钥应该会自动正确设置。那么,有人有什么想法,可能出了什么问题?我还检查了路径、防火墙规则以及在临时文件夹中编写启动脚本的能力。请问是否可以尝试重新创建此问题?+ 我应该向Google提出这个问题吗?(以前从未做过这样的事情,我非常不确定:S)感谢您的帮助 :)