OnDemand Version Update

On Wednesday, December 11 from 9am-915am there will be a short interruption of service for OnDemand to deploy a new version of the portal. It will deploy some updates to the web apps and infrastructure. **During this interruption any active shell connections, noVNC connections, and file transfers will be terminated. Afterwards one should be able to reconnect to running VDI and iHPC sessions.** Contact if there are any questions.

GPFS filesystem Problem

We are having issues with GPFS filesystem (both project and scratch) on all clusters. It started around 3:08 PM, Oct 24, 2019. This also causes the inaccessibility of OSC OnDemand. We are not clear whether there are any job failures due to this problem. We are working to resolve the issue now. We will keep you posted and apologize for any inconvenience. Please contact if you have any questions.

Ls-dyna license outage

The ls-dyna license server that OSC is hosting has not been available since Oct 15, 2019. This outage is due to hardware failure on the server. We apologize for any inconvenience this may cause you. Please contact if you have any questions.

TotalView Debugger Removal

The TotalView license server will shutdown and support of TotalView installed on OSC systems discontinued, along with the statewide licensing, on Nov. 1, 2019. Recently, a security vulnerability was found on the old license server software. OSC has a permanent Totalview license, but it is without the maintenance of the software. Thus, we cannot update the software to a new version. We have provided another HPC debugger, DDT, from ARM. Please consider migrating to DDT. Contact OSC Help for comments, questions or concerns.

Scratch Filesystem Errors Resolved

We have resolved a problem with the Scratch filesystem that gives errors "No space left on device". The cause is that the metadata subsystem is pretty full. The outage was caused be the rapid exhaustion of metadata storage space, the reason for the spike in metadata space utilization is unknown. The scratch filesystem has been returned to service after we worked with the vendor to implement a temporary workaround. We are working with the vendor to find the root cause and a permanent fix for the underlying problem. We apologize for any inconvenience this may cause.


Gaussian is the most popular general purpose electronic structure program. Recent versions can perform density functional theory, Hartree-Fock, Möller-Plesset, coupled-cluster, and configuration interaction calculations among others. Geometry optimizations, vibrational frequencies, magnetic properties, and solution modeling are available. It performs well as black-box software on closed-shell ground state systems. 

HOW TO: Look at wall-time accuracy using XDMoD

The XDMoD tool at can be used to get an overview of how accurate the requested wall-time of jobs are with the actual wall-time of jobs.

The requested wall-time is the amount of time that one wants to reserve resources.

#PBS -l walltime=xx:xx:xx

The actual walltime is how long the job held the reserved resources before completing. It will be related to one in the job output file with filename



System Downtime October 8, 2019

A downtime for all HPC systems is scheduled from 7 a.m. to 5 p.m., Tuesday, October 8, 2019. The downtime will affect the Pitzer, Ruby and Owens Clusters, web portals, and HPC file servers. Login services, including, access to storage and license server for hyperworks hosted by OSC will not be available during this time. In preparation for the downtime, the batch scheduler will begin holding jobs that cannot be completed before 7 a.m., October 8, 2019.