在安装好OpenMPI后，执行命令mpirun -np 2 -hostfile hostfile --allow-run-as-root hello_c
出现了如下错误：
orted: error while loading shared libraries: libopen-rte.so.40: cannot open shared object file: No such file or directory
--------------------------------------------------------------------------
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).网上的解决方案都是将openmpi路径添加到环境变量LD_LIBRARY_PATH中，但这里在安装openmpi时已经配置好了，实际上路径并没有问题。
最终的解决方案为运行命令：ldconfig 然后就解决了，当然也实在不行可以试试重启系统
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