Ruby retirement 29 Oct. 2020

The Ohio Supercomputer Center's Ruby Cluster is expected to be retired on Thursday, October 29 and your work needs to be migrated to a different cluster (Owens or Pitzer) at OSC. You may continue running production work on Ruby until it is shut off. There are a number of key things to consider when selecting a new system: Jobs on Owens or Pitzer may request partial nodes which is in contrast to Ruby.

HOWTO: Debugging Tips

This article focuses on debugging strategies for C/C++ codes, but many are applicable to other languages as well.

Rubber Duck Debugging

This approach is a great starting point. Say you have written some code, and it does not do what you expect it to do. You have stared at it for a few minutes, but you cannot seem to spot the problem.

Pitzer Expansion Early User Program

In preparation for the deployment of the new hardware as well as the Slurm migration on Pitzer in fall 2020, OSC would like to invite all members of the client community to participate in the Pitzer Expansion Early User Program in order to test the functionality of new hardware, including Dual GPU and Quad GPU features, and test the new Slurm scheduler and its TORQUE/Moab compatibility. Jobs that are eligible for the early user program will not be charged and there is no registration required, all OSC users are eligible.

Backup failures for Project on August 1st and 2nd

OSC experienced backup failures on our GPFS file systems (both Project file systems, /fs/project and /fs/ess) the mornings of August 1st and 2nd. The underlying cause was identified and backups were operating as expected the morning of August 3rd. As a result of these failed backups, OSC will not be able to complete some file restore requests for files changed between approximately 2020-07-31 02:30 through 2020-08-02 02:30.

System Downtime August 18, 2020

A downtime for all OSC HPC systems is scheduled from 7 a.m. to 9 p.m., Tuesday, August 18, 2020. The downtime will affect the Pitzer, Ruby and Owens Clusters, web portals and HPC file servers. Login services, except for, will not be available during this time. OSC clients are able to log into during the downtime but no changes will take place until the downtime is completed. In preparation for the downtime, the batch scheduler will begin holding jobs that cannot be completed before 7 a.m., August 18, 2020.