Daily Bulletin Archive

January 22, 2014

Yellowstone users can launch coarray programs, which are increasingly common in parallel processing, by following recently published CISL documentation on the subject. Part of the Fortran 2008 standard, coarrays are highly scalable, with a simple syntax that can make scalable codes easy to read. By enabling programmers to express parallelism more easily, they can help reduce future code maintenance costs. See Launching a coarray program for more information.

January 21, 2014

The CISL Consulting Services Group will present a one-hour workshop at 1:30 p.m. Friday, January 17, to introduce participants to using the Yellowstone, Geyser, and Caldera systems. Topics to be covered including logging in, working with environment modules, compiling code, and running batch jobs and interactive jobs.

Participants can attend in person at the VisLab in NCAR’S Mesa Lab in Boulder, or remotely by logging in to the online meeting, for which registration is required.

January 21, 2014

UCAR/NCAR, including the CISL Help Desk and consulting services, will be closed Monday, January 20 in observation of Martin Luther King day.

For problems please send email to cislhelp@ucar.edu and they will be addressed Tuesday, January 21.

For emergencies, you can still call x2400 (303-497-2400) to speak to CISL staff on duty.

January 15, 2014

No Scheduled Downtime: Yellowstone, Geyser_Caldera, HPSS, GLADE

January 9, 2014

New utilities in Yellowstone users' default environment provide information on queue activity and backfill windows. Executing the bsumm command shows how many jobs are running or pending in the Yellowstone, Geyser, and Caldera queues, and how many nodes are in use. The bfill command identifies backfill windows as described on the CISL Running jobs documentation page.

Contact cislhelp@ucar.edu if you have questions about using these commands and how they can help you spot opportunities to get compute jobs done quickly.

January 8, 2014

HPSS:   Downtime Tuesday, January 7 , 7:00am. - 9:00am.

No Scheduled Downtime: Yellowstone, Geyser_Caldera, GLADE

January 3, 2014

No Scheduled Downtime: Yellowstone, HPSS, Geyser_Caldera, GLADE

January 2, 2014

CISL now creates snapshots of the GLADE home file space several times each day to enable users to retrieve deleted files or roll back to earlier versions of files they have revised. The home space is still backed up daily, but users can retrieve their own files from snapshots quickly rather than wait to have CISL restore backup copies.

See Recovering files from snapshots for details and contact cislhelp@ucar.edu if you have questions.

December 26, 2013

Command files used in LSF batch jobs can contain multiple independent MPI executables that require different processor counts. This is demonstrated in new example on CISL's "Platform LSF tips" page of how to submit Multiple Program, Multiple Data (MPMD) jobs using command files. The executables in this example require different numbers of tasks.

December 20, 2013

The NCAR-based SIParCS program (Summer Internships in Parallel Computational Science) offers significant hands-on R&D opportunities in high-performance computing (HPC) and related fields that use HPC for scientific discovery and modeling. This 11-week internship program is designed for graduate students and undergraduate students at U.S. universities who have completed their sophomore year by summer 2014. SIParCS embeds students in mentored research projects in computational science relevant to NCAR’s mission. The 2014 summer program runs from May 19 through August 1.

Application deadline: 15 January 2014
Contact: Kristin MooneyNCAR/CISL, 303-497-1288
SIParCS

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