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C, C++ and Fortran are supported on the Pitzer cluster. Intel, PGI and GNU compiler suites are available. The Intel development tool chain is loaded by default. Compiler commands and recommended options for serial programs are listed in the table below. See also our compilation guide.


In late 2018, OSC installed 260 Intel® Xeon® 'Skylake' processor-based nodes as the original Pitzer cluster. In September 2020, OSC installed additional 398 Intel® Xeon® 'Cascade Lake' processor-based nodes as part of a Pitzer Expansion cluster.

Statewide Users Group Conference Agenda - October 22, 2020


Walltime Limit

Here are the queues available on Pitzer Expansion:


How to Connect

  • SSH Method

To login to Pitzer Expansion Hardware at OSC, ssh to one of the following hostnames: 

You can either use an ssh client application or execute ssh on the command line in a terminal window as follows:

Owens, Pitzer

This page documents the known issues for migrating jobs from Torque to Slurm.


Please be aware that $PBS_NODEFILE is a file while $SLURM_JOB_NODELIST is a string variable. 

The analog on Slurm to cat $PBS_NODEFILE is srun hostname | sort -n 

Owens, Pitzer

How to Submit Interactive jobs

There are different ways to submit interactive jobs.

Using qsub

qsub command is patched locally to handle the interactive jobs. So mostly you can use the qsub command as before:


OSC has purchased $4.5 million of compute hardware which will approximately triple the peak capacity of the Pitzer cluster, adding 2.6 petaflops. Below is a summary of the hardware information:

Owens, Pitzer

Submit Jobs

Use Torque/Moab Command Slurm Equivalent
Submit batch job qsub <jobscript> sbatch <jobscript>
Submit interactive job qsub -I [options]

sinteractive [options]

salloc [options]

Owens, Pitzer