大连人工智能计算平台——华为昇腾AI平台——高性能计算HPC——调度器dstart的ssh启动方式不可用

根据华为的官方文档：

https://support.huawei.com/enterprise/zh/doc/EDOC1100228705/d1f5a239#ZH-CN_TOPIC_0000001212004449

可以知道，HPC的启动方式如果不指定--mca plm_rsh_agent方式启动，那么默认的启动方式为ssh方式启动MPI，但是实际操作后发现不可行，报错：

ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
Host key verification failed.
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
ssh_askpass: exec(/usr/libexec/openssh/ssh-askpass): No such file or directory
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
Host key verification failed.
--------------------------------------------------------------------------
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).
--------------------------------------------------------------------------
--------------------------------------------------------------------------
ORTE does not know how to route a message to the specified daemon
located on the indicated node:

  my node:   dlhpcshare-agent-37
  target node:  dlhpcshare-agent-25

This is usually an internal programming error that should be
reported to the developers. In the meantime, a workaround may
be to set the MCA param routed=direct on the command line or
in your environment. We apologize for the problem.
--------------------------------------------------------------------------
[dlhpcshare-agent-37:2299732] 22 more processes have sent help message help-errmgr-base.txt / no-path
[dlhpcshare-agent-37:2299732] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages

结论就是：

这个HPC平台没有为计算节点设置ssh的免密码认证，因此各计算节点通过ssh通信时是无法认证通过的，由此报错；由此可以知道，在该HPC上是不能使用ssh的方式进行计算节点通信的，还是要使用--mca plm_rsh_agent方式来进行子节点的启动通信的。

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