> No, the location of $HOME should not matter. > > What happens if you "mpirun -np 2 uptime"? (i.e., use mpirun to launch > a non-MPI application) >
Thanks. it returns right result! but still only 2 local processes. I tried again to add a hostfile option "--hostfile $HOME/openmpi/bin/hostfile" to mpirun, with the hostfile containning two items: IA64_node0 and IA64_node1 ,but this time it complained: [time returned by IA64_node0] bash line 1: orted : command not found oops! Should I have done a misconfig for openmpi? btw,openmpi was installed under HOME directory of user semper on each node of the cluster. The 4 nodes can "ssh" or "rsh" login in each other without password prompt.
