The Daily Bulletin

The Yellowstone system, Geyser and Caldera clusters, and GLADE file systems will be unavailable during a scheduled maintenance period from 6 a.m. to 4:00 p.m. Tuesday, July 7. CISL will implement a new Mellanox “PQFT” routing engine algorithm that is expected to reduce congestion in the Yellowstone InfiniBand interconnect fabric. Other updates include replacement of a faulty ethernet switch in the Geyser cluster and upgrading GPFS to version 4.1. The new version will likely reduce system hangs.

A system reservation will be put in place 12 hours before the scheduled downtime. Users’ jobs with specified job times that overlap the reservation period will remain on hold until the system is restored to service. Longer-running jobs that have not finished by 6 a.m. Tuesday will need to be resubmitted after the maintenance period.

Robert Sinkovits, Ph.D., scientific applications lead at the San Diego Supercomputer Center (SDSC), will teach a class titled “Introduction to Performance Tuning and Optimization” from 9 a.m. to noon MDT on Thursday, July 16, at NCAR’s Mesa Lab in Boulder.

The class is intended for participants who do their own code development and need their calculations to finish as quickly as possible. It will cover the effective use of cache, loop-level optimizations, force reductions, optimizing compilers and their limitations, short circuiting, time-space tradeoffs, and more. The class will emphasize general techniques that can be applied in any language.

If you attend in person, bring a laptop computer with an SSH client installed so you can log into one of the supercomputing systems at SDSC or NCAR. SDSC training accounts will be available for those who need them. 

The class will be in the VisLab, which is Mesa Lab Room 4. Space is limited, so please register only if you are certain you can attend. The session will also be webcast and recorded for later review. You can register at one of these links:

Registration is now open for the RMACC High Performance Computing Symposium, which is scheduled for August 11 to 13 on the University of Colorado’s Boulder campus. The symposium schedule features two keynote speakers; hands-on and lecture-style tutorials; and educational, professional, and student-focused panels.

The Rocky Mountain Advanced Computing Consortium is a collaboration among academic and research institutions that include NCAR, CU-Boulder and others throughout the intermountain states.

See the RMACC site for schedule and registration details.