问题描述：节点一即host3，通过mpirun调用节点二即host4的mpi程序，报错如下。
$ mpirun -np 1 --host host4 ./main [[INVALID],INVALID] ORTE_ERROR_LOG: Not found in file ess_env_module.c at line 367 [[INVALID],INVALID]-[[59225,0],0] mca_oob_tcp_peer_try_connect: connect to 255.255.255.255:51754 failed: Network is unreachable (101) -------------------------------------------------------------------------- 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 locat