Saguaro is a massively parallel cluster – a collection of many small compute nodes that are interconnected with a high-speed, low-latency network fabric. There are a small number of Internet facing head (or login) nodes that are shared by all users accessing the system. If you need to perform any compute intensive tasks, you need to request access to one or more of the compute nodes by enqueuing a job. The simplest case for this is an interactive job that gives you direct control over the compute node(s). In order to start an interactive job, just login to Saguaro and then use the ‘qsub’ command.
saguaro1:~/ > qsub -I
(note that is a capital ‘i’ for ‘interactive’, not a lower case ‘L’) This will give you something like the following:
qsub: waiting for job 4213873.moab.local to start
qsub: job 4213873.moab.local ready
You now have an interactive shell on one of the compute nodes, in this case ‘s50-10’.
Software packages and libraries on Saguaro are packaged into ‘modules’. You can see a current listing of the set of available modules at our software page or from the command line.
[saguaro1:~]$ module avail
[saguaro1:~]$ module load openmpi/1.4.3-intel