
Hydra is a process management system for starting parallel jobs. Hydra
is designed to natively work with multiple daemons such as ssh, rsh,
pbs, slurm and sge. However, in the current release, only ssh, rsh and
fork are supported, with a preliminary version of slurm available.

More information about using Hydra can be found here:
http://wiki.mcs.anl.gov/mpich2/index.php/Using_the_Hydra_Process_Manager
