CISL Daily Bulletin

The Daily Bulletin delivers news about CISL’s high-performance computing environment, training opportunities, scheduled maintenance, and other events of interest to the user community. To get the Daily Bulletin by email, use this link to subscribe.

All welcome at April 6 SEA general interest meeting

March 20, 2023

The UCAR Software Engineering Assembly (SEA) will hold a general meeting of members and prospective members from 10 to 11 a.m. MDT on Thursday, April 6. The meeting will be virtual and all UCAR/NCAR staff members who are interested in scientific software engineering are welcome. You do not need to be classified as a “software engineer” to be welcome in the SEA. In the meeting, the current execu...

Cheyenne restored from weekend power loss

March 20, 2023

The Cheyenne cluster is back online after a regional power incident disrupted operations at the NCAR-Wyoming Supercomputing Center on Saturday, March 18, from approximately 10 a.m to 7:30 p.m. MDT. Cheyenne is operating with one switch offline and one switch in a degraded state as a result of the power disruption. CISL engineers have discovered that certain applications may experience reduced ...

Derecho weekly update

March 20, 2023

During the week of March 13, the NWSC-3 project team continued resolving a myriad number of hardware and software issues encountered during the initial benchmark runs and NCAR team’s health checks. Later this week, the Spectrum Scale file system will be mounted on Derecho, allowing the consulting team to start building the software stack which will be used during the Acceptance Test Plan (ATP) ...

System downtimes for week of March 20 - 24

March 17, 2023

Stratus will be down between 7 AM to 7PM Tuesday, March 21 for an upgrade. No downtime is planned for Cheyenne, Casper, GLADE, Campaign Storage, Quasar, or JupyterHub.

Where to run small, CPU-only jobs?

March 16, 2023

CISL recommends running small jobs that use only CPUs on the Casper cluster’s high-throughput computing (HTC) nodes. Casper has 64 HTC nodes specifically for running small batch jobs. It also has: • More shared resources than the Cheyenne share queue. • A far higher concurrent-use limit for CPU cores than Cheyenne: 468 vs. 36. • More available memory, plus NVMe swap for overflow and local stora...

First ESDS collaborative work session April 17

March 14, 2023

The Earth System Data Science (ESDS) initiative is organizing a series of work sessions in which scientists and software engineers can collaborate on shared analysis workflow problems. These sessions encourage cross-lab collaboration and build lasting science-software partnerships. They are open to NCAR/UCAR staff and others who are interested. The first session – “Working with Unstructured Gri...