[OMPI users] open mpi upgrade

hi, my dear friends i tried to upgrade my openmpi version from 1.2.8 to 1.8.8 but after installing it on different directory "/opt/openmpi-1.8.8/" when i enter mpirun its version is 1.2.8 and after installing the directory "/opt/openmpi-1.8.8/" is empty!! so what should i do for installing and usi

[OMPI users] connection time out (110)

hi my friends, i getting error connection time out (110) even after echo 1 > /proc/sys/net/core/somaxconn echo 10 > /proc/sys/net/core/netdev_max_backlog mpirun --mca oob_tcp_listen_mode listen_thread -np 1024 my_mpi_program my program work on 2 nodes only if i add one more its going t