Daily Bulletin Archive

Jun. 16, 2017

New users sometimes contact the CISL Help Desk to ask how to change their default login shell for the Cheyenne system. The quickest way to do it—for both Cheyenne and Yellowstone—is through our Systems Accounting Manager (SAM). In the “Login Shell” section of your preferences screen, select a system and then click the “Edit” button to make your change. It may take several hours for the change to take effect.

What else can you do with SAM? See this page to find out.

Jun. 1, 2017

CISL will resume enforcing the 45-day /glade/scratch purge policy on June 1. The policy was suspended during the recent transition to the new, larger GLADE scratch system. Users’ files that are not accessed (for example: modified, read, or copied) within the 45 days following June 1 will be deleted automatically on July 15.

Also on June 1, as announced previously, the read-only /glade/scratch_old file space will be removed so it can be repurposed. Yellowstone users who have not already done so should copy any scratch files that they want to keep from /glade/scratch_old to /glade/scratch before that date.

Please see GLADE File Spaces for more information about using the GLADE centralized file service.

May. 31, 2017

Time is running out for Yellowstone users to copy files that they want to keep from /glade/scratch_old to /glade/scratch. The old space is available in read-only mode until June 1, at which point it will be removed so it can be repurposed.

Users who work with numerous small files may see a difference in how much space their files occupy on the new system because of its larger block size and sub-block allocations. See this Best practice section of our GLADE documentation for guidance.

May. 31, 2017

The regular registration deadline is coming up May 31 for PEARC17, the Practice & Experience in Advanced Research Computing conference July 9-13 in New Orleans. It’s also the deadline for locking in the conference hotel room rate. (These deadlines will not be extended.) Late registration fees take effect June 1.

PEARC17 will include a robust schedule of tutorials, a special student program, and a technical program that includes four paper tracks, posters, a Visualization Showcase, and Birds of a Feather (BoF) sessions. Keynote speakers will be Paula Stephan, Georgia State University professor of economics and research associate with the National Bureau of Economic Research, and Paul Morin, founder and director of the Polar Geospatial Center, an NSF science and logistics support center at the University of Minnesota.

See the PEARC17 website for details.

May. 30, 2017

Yellowstone, Cheyenne, Geyser_Caldera, GLADE Downtime Tuesday, May 30 from 8:00 am - 6:00 pm

No Downtime: HPSS 

May. 30, 2017

The Yellowstone, Cheyenne, Geyser, and Caldera clusters and the GLADE file system will be unavailable from 8 a.m. to 6 p.m. MDT on Tuesday, May 30, to allow CISL staff to expand and upgrade the GLADE file system. When complete, GLADE’s capacity will be increased by almost 20PB.

A system reservation will be put in place on batch jobs the afternoon on Monday, May 29.  After the system reservation is in place, jobs submitted with specified job times that overlap the reservation period will remain on hold until the system is restored to service. Running jobs that have not finished when maintenance begins will be killed and will need to be resubmitted after the maintenance period.

We apologize for any inconvenience this might cause. Users will be informed via the CISL Notifier service when the systems are returned to production.

May. 24, 2017

The CISL User Services Section will present an in-person and online tutorial at 1:30 p.m. MDT on Thursday, May 25, at the NCAR Mesa Lab in Boulder to help users prepare to work with the new Cheyenne HPC system. The 60-minute tutorial will cover typical workflows in the Cheyenne environment as well as performance and operational differences between the Yellowstone and Cheyenne systems.

Topics to be covered include:

  • Technical specifications for Cheyenne and the expanded GLADE file systems

  • The Cheyenne computing environment

  • Accessing software, including compilers and MPI libraries

  • Submitting batch jobs using the PBS scheduler

The tutorial will conclude with a Q&A session, so please bring other general questions and concerns not covered above. Register to attend in person—at the VisLab in NCAR’s Mesa Lab (ML4) in Boulder—or via webcast by selecting a link below:

May. 19, 2017

Ensemble runs, data assimilation runs, and other jobs run on Cheyenne and Yellowstone can generate tens or hundreds of thousands of output files, log files, and others over time. Such large numbers of files can be difficult to manage and remove from GLADE file spaces when they are no longer needed. Configuring jobs to place no more than 2,000 to 3,000 files in a single directory will make them easier to manage.

See Removing large numbers of files for how to remove massive accumulations of files and see this page for more best practices.

May. 9, 2017

Users are asked to log in directly to individual login nodes when using the Cheyenne, Yellowstone, Geyser, and Caldera systems on Tuesday, May 9, while CISL makes changes to some critical infrastructure components. The changes are needed to improve the stability of these environments and will be done in a rotation so users will continue to have access and jobs can continue to run throughout the day.

Rather than log in with your normal procedures during the times below, use one of the node IDs shown in place of “cheyenne” or “yellowstone.”

8 a.m. to Noon MDT

Cheyenne - cheyenne1, cheyenne2 or cheyenne3

Yellowstone - Use yslogin1, yslogin2 or yslogin3


Noon to 5 p.m. MDT

Cheyenne — Use cheyenne4, cheyenne5 or cheyenne6

Yellowstone — Use yslogin4, yslogin5 or yslogin6

May. 8, 2017

The deadline for submitting poster abstracts, Visualization Showcase proposals and Birds-of-a-Feather proposals for PEARC17—the Practice and Experience in Advanced Research Computing conference in New Orleans, July 9-13, 2017—has been extended to Monday, May 8.

Submissions should emphasize experiences and lessons derived from the operation and use of advanced research computing on campuses or provided for the academic and open science communities. Submissions that align with the conference theme—Sustainability, Success, and Impact—are particularly encouraged. See the Call for Participation for more information.

Students whose posters are accepted are eligible to apply for financial support to cover the costs of airfare, shared lodging, and registration fees. Here’s more information on the Student Program.