Daily Bulletin Archive

Feb. 8, 2018

CISL has installed new versions of Python (2.7.14 and 3.6.4) for users of the Cheyenne system, with new functionality for loading NCAR-provided Python packages. Users now load all of the latest packages at once by running a new ncar_pylib script that activates the NCAR package library in a virtual environment. Packages for earlier versions of Python can be loaded only with module load commands.

Implementing virtual environments enables users to quickly access multiple versions of their package-development codes. Users who want to customize their Python environment can simply clone the package environment as a starting point, then make modifications. The new approach also will help users avoid errors when installing their own packages by using the virtual environment rather than home directories on GLADE.

Python 2.7.14 and 3.6.4 and the NCAR package library methodology will become the default on the Cheyenne system in February, on a date to be announced. The CISL Python documentation page has been updated to describe the new procedures.

Feb. 6, 2018

Cheyenne will be unavailable on Tuesday, February 6, starting at approximately 7 a.m. MST to allow CISL staff to update system software components. The outage is expected to last until approximately 6 p.m. but every effort will be made to return the system to service as soon as possible.

A system reservation will prevent batch jobs from executing after 7 a.m. All batch queues will be suspended and Cheyenne’s login nodes will be unavailable throughout the update period. All batch jobs and interactive processes that are still executing when the outage begins will be killed.

Jobs and interactive sessions that are running on the Geyser and Caldera clusters when the update period begins will not be interrupted but users will not be able to log in to or submit new jobs to those systems until Cheyenne is returned to service. Users who need access to the Geyser or Caldera systems on Tuesday are advised to initiate an interactive session before 7 a.m. on Tuesday.

CISL will inform users through the Notifier service when Cheyenne is restored. We apologize to all users for the inconvenience this will cause and thank you for your patience.

Feb. 6, 2018

Cheyenne downtime: Feb. 6 8 am. to 8 pm.

No downtime: HPSS, GLADE, Geyser_Caldera

Feb. 6, 2018

This one-hour tutorial will focus on practices and procedures for efficiently storing and retrieving files from the NCAR/CISL High Performance Storage System (HPSS). The tutorial is at 11 a.m. MDT on Wednesday, March 14, both online and in the Chapman Room (ML245) at the NCAR Mesa Lab in Boulder.

Participants will learn how to manage their workflows to avoid overspending storage allocations, and what to do if their transfers fail because they’ve reached their storage limits. The limits will be enforced beginning Monday, April 2, as announced here. Topics also include deciding when data should (and should not) be archived to HPSS; how to archive large data sets efficiently; and how best to retrieve and archive files depending on the location of the user’s processes.

Please register using one of these links:

Feb. 2, 2018

Registration is now open for a free, four-hour tutorial on wrf-python from 8 a.m. to noon on Wednesday, March 7, at the NCAR/UCAR Corporate Technical Training Center (CG-2) in Boulder. The tutorial is a beginner-friendly introduction to wrf-python for users of the Python programming language. Seating is limited to 16 students. The deadline for registration is February 21. See this link for more information and registration.

Jan. 30, 2018

HPSS downtime: Tuesday, January 30 from 7:00 am - 11:00 am MST

No downtime: Cheyenne, GLADE, Geyser_Caldera

Jan. 29, 2018

Users’ Cheyenne jobs sometimes fail because not enough usable memory is available to run them. Determining how much memory a program needs to run is a key step in avoiding this problem, so CISL provides the peak_memusage tool to help. 

See Checking memory use for how to use peak_memusage. Also see this page for how to specify your memory requirements in a job script.

Jan. 29, 2018

CISL staff will perform maintenance on the Geyser and Caldera clusters today, January 29, from approximately 10 a.m. until 2 p.m. MST to update the systems’ directory information services configurations.

No interruptions to Geyser, Caldera, Cheyenne, or the GLADE file system are expected throughout the maintenance period.  Please contact cislhelp@ucar.edu if you experience any disruptions.

Jan. 25, 2018

Registration is now open for an NCAR/CISL series of four one-day workshops on Modern Fortran beginning Tuesday, February 6.

Dan Nagle, CISL Consulting Services Group software engineer and a member of the U.S. Fortran Standards Technical Committee, will provide the training at the NCAR Mesa Lab’s Fleischmann Building in Boulder.

Participants are encouraged to bring their own laptop computers with recent releases of gfortran, mpich, and opencoarrays. Each workshop will begin at 9 a.m. and end at 4 p.m. with an hour break at noon.

  • Scalar Fortran - February 6: Scope, definition, scalar declarations and usage, and interacting with the processor.

  • Vector Fortran - February 20: Arrays, storage order, elemental operations, and array intrinsics.

  • Object-Oriented Fortran - February 27: Derived types, defined operations, defined assignment, and inheritance.

  • Parallel Fortran - March 6: Coarray concepts, declarations, and usage; synchronization and treating failed images.

Use this form to register to attend one or more workshops. The workshops will not be webcast or recorded.

Jan. 22, 2018

The Cheyenne, Wyoming, area experienced widespread power outages on Sunday from heavy snow and wind. Following several hours of issues related to power stability, the Cheyenne HPC system was powered down Sunday night to protect the hardware.

As of 9 a.m. MST today, power is being restored and CISL staff expect to have the Cheyenne system back up by 2 p.m. CISL will inform users through the Notifier service when the system is restored.