Equipment

SGI Altix 3700 (Altix)

Running Jobs on the SGI Altix

A queuing system for the Altix will be set-up soon. In the meantime, users can submit jobs interactively using the 'nohup' command. Although there is not any enforcement yet of a maximum number of concurrent jobs allowed per user on the Altix, we ask that each user be considerate to others and do not run too many jobs simultaneously.

Examples of job submission:

1. To run a serial executable a.out:

altix> ./a.out

Or run the code using 'nohup' in order to be able to logout without interrupting the running job:

altix> nohup ./a.out &

2. To run an MPI job using 4 processors:

altix> mpirun -np 4 ./a.out

Or use 'nohup':

altix> nohup mpirun -np 4 ./a.out &

3. To run an OpenMP job using 4 processors:

Using bash:

altix> export OMP_NUM_THREADS=4
altix> ./a.out

Using tcsh/csh:

altix> setenv OMP_NUM_THREADS 4
altix> ./a.out