It really depends. You certainly CAN have mpirun/mpiexec use ssh to launch the remote processes. If you're using Torque, though, I strongly recommend using the hooks in OpenMPI, into the Torque TM-API (see http://www.open-mpi.org/faq/?category=building#build-rte-tm). That will use the pbs_mom's themselves to launch all the processes, which has several advantages.
Using the TM-API for job launch means that remote processes will be children of the Torque pbs_mom process, not the sshd process, which means that Torque will be able to do a better job at killing rogue processes, reporting resources utilized, etc. Lloyd Brown Systems Administrator Fulton Supercomputing Lab Brigham Young University http://marylou.byu.edu On 02/29/2012 02:09 PM, Denver Smith wrote: > Hello, > > On my cluster running moab and torque, I cannot ssh without a password > between compute nodes. I can however request multiple node jobs fine. I > was wondering if passwordless ssh keys need to be set up between compute > nodes in order for mpi applications to run correctly. > > Thanks > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
