Daily Bulletin Archive

July 17, 2019

The Campaign Storage system will be unavailable for an estimated two hours beginning at 10 a.m. today so CISL engineers can address a hardware issue and restart the system. All Globus tasks using the Campaign Storage endpoint will be paused and then resumed after the outage. Campaign Storage directories also will be largely inaccessible via the data-access nodes during the work. Users will be informed via the CISL Notifier service when the system has been restarted.

July 15, 2019

Registration is open for Optimized Modern Fortran, a July 22 workshop led by Alessandro Fanfarillo, NCAR Research Applications Laboratory, to help participants make their Fortran codes run more efficiently through vectorization and other techniques.

When: 9 a.m. to noon, 1 to 3 p.m. Monday, July 22

Where: Room 3131, Center Green campus (CG1), Boulder

Participants will get a detailed, practical explanation of how to obtain high performance from modern Fortran codes, with a particular focus on how to exploit the hardware instructions provided by modern processors. Prerequisite: Basic knowledge of Fortran 90 constructs, such as array syntax and allocation, recursion, modules, and intrinsic, elemental and pure functions.

Participants are encouraged to bring their own codes and laptop computers. Lunch will be provided. Some travel funding is available. See the Optimized Modern Fortran Workshop web page for details and registration.

July 15, 2019

Registration is open for the 2019 International Computing in Atmospheric Sciences (iCAS) Symposium, September 8-12 in Stresa, Italy. NCAR, which hosts the iCAS series, announced that keynote presentations will focus on the European Open Science Cloud and the Daniel K. Inouye Solar Telescope.

On Monday, September 9, Tiziana Ferrari from EGI and Hannes Thiemann from DKRZ will discuss "The European Open Science Cloud and its Use Cases for Climate, Weather, Earth, and Environmental System Research."

On Wednesday, September 11, Alisdair Davey from the U.S. National Solar Observatory, will present on "The Daniel K. Inouye Solar Telescope (DKIST): A Next-Generation Ground-Based Solar Telescope."

For information about the keynote talks and the speakers, and to register for the symposium, see the iCAS 2019 site. Room reservations should be made directly with the hotel before August 7. After that date, rooms will be available on a first-come, first-served basis. See the iCAS site for a link to the hotel reservation form.

July 15, 2019

No scheduled downtime: Cheyenne, Casper, Campaign Storage, GLADE and HPSS.

July 11, 2019

The Casper cluster’s Slurm workload manager will be unavailable today from 11 a.m. until approximately 1 p.m. MDT to allow CISL system administrators to perform maintenance.

During that period, new Slurm job submissions from Casper or Cheyenne will not be possible and the “execdav” command will not work. However, users will be able to log in directly to Casper to access the GLADE file system and HPSS. No interruptions are expected to existing Casper login sessions or batch jobs that are already running or queued for execution.

Users will be informed via the CISL Notifier service when the maintenance is complete and Casper is returned to service.

July 11, 2019

Use relative paths and environment variables instead of hardcoding directory names in your job scripts. Hardcoding in scripts and elsewhere can make debugging your code more difficult and also complicate situations in which others need to copy your directories to build and run your code as themselves.

See this CISL page for a simple example and more information.

July 8, 2019

No scheduled downtime: Cheyenne, Casper, Campaign Storage, GLADE and HPSS.

July 5, 2019

The Cheyenne system’s batch nodes were taken offline at 8 a.m. today to allow CISL system administrators to address some network fabric issues that have affected batch job performance this week. The work required a pause of the PBS job scheduler and Cheyenne queues.

Jobs that were still running as of 8 a.m. were killed. Others that were queued but not running before 10:30 p.m. on Thursday do not need to be resubmitted.

CISL will attempt to return the batch nodes to service by midday today. In the meantime, login nodes and the Casper cluster will remain operational. Watch for updates during the day through the Notifier service. Thank you for your patience.

July 3, 2019

The Cheyenne system was returned to production late Tuesday evening following completion of the operating system update and system verification. As noted in previous communications, users are advised to to rebuild their executables and thoroughly test all scripts. Many system libraries changed in the new version of the OS, which is SUSE Linux Enterprise Server (SLES) Service Pack 4. Executables built before the upgrade are likely to fail.

Other significant changes were made to the module environment during the upgrade, and users can now manage their Campaign Storage data holdings with POSIX commands. See these new Daily Bulletin items for details:

Please report any suspected issues with the new user environment as soon as possible to cislhelp@ucar.edu. Thank you all for your patience and cooperation throughout this extended outage.

July 3, 2019

The entire collection of environment modules has been reconstructed as part of Cheyenne’s operating system upgrade. Recent versions of commonly used software libraries are available for most compiler and MPI combinations. Additionally, recent releases of popular analysis software like Python, MATLAB, IDL, and R have been installed.

The default set of modules is now ncarenv, intel/18.0.5, ncarcompilers, mpt/2.19, and netcdf/4.6.3. Multiple versions of the Intel and GCC compiler are available, as is a PGI offering. Two MPI libraries are installed for each compiler.

Old modules that were built with system libraries from the previous OS have been archived and are no longer loadable. We apologize for any inconvenience this may cause, but it was necessary to prevent unexpected and/or broken behavior under the new OS version.