我试图在我电脑上的两个Ubuntu虚拟机上运行hello_ompi程序。这个程序可以在here中找到。
VM有两个处理器，每个处理器有一个内核。安装的操作系统是Ubuntu 20。04.3-LTS 64位。
我使用的hostfile如下：

192.168.xxx.xxx
192.168.xxx.xxx

我试过：

mpirun -n 2 --hostfile my_hostfile hello_ompi

结果是：

--------------------------------------------------------------------------
mpirun was unable to find the specified executable file, and therefore
did not launch the job.  This error was first reported for process
rank 0; it may have occurred for other processes as well.

NOTE: A common cause for this error is misspelling a mpirun command
      line parameter option (remember that mpirun interprets the first
      unrecognized command line token as the executable).

Node:       192.168.xxx.xxx
Executable: hello_ompi
--------------------------------------------------------------------------