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 high-performance computing (HPC) and data storage systems hosted at the NCAR-Wyoming Supercomputing Center will be unavailable during part or all of a scheduled maintenance downtime beginning early Monday morning, July 26, to allow CISL staff and contractors to update the facility’s power infrastructure in preparation for the arrival of the new Derecho system. The Cheyenne system’s login no...
No downtime scheduled for Cheyenne, Casper, Campaign Storage, JupyterHub, HPSS, GLADE, Quasar, or Stratus.
Later this year, the National Center for Atmospheric Research (NCAR) will deploy Derecho, its next-generation HPC system, and NCAR will begin accepting proposals in July from university-led teams to participate in the Accelerated Scientific Discovery (ASD) program on the system. The ASD program will provide a unique opportunity for a small group of large-scale computational projects to have nea...
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. Here’s an exa...
Users creating conda environments may encounter an I/O bug on Cheyenne and Casper when using Python versions 3.8 or later, so CISL recommends specifying Python 3.7 unless a new version is needed. Users encountering the bug receive an error message saying “BlockingIOError: [Errno 11] Resource temporarily unavailable.” Specifying Python 3.7 or an earlier version will avoid the problem. When creat...