In This Message

Did You Know?
  – Job Step Viewer

Center Announcements
  – ALCC Call for Proposals (Pre-Proposal is Due Friday)
  – User Assistance Center Schedule

Meetings & Workshops
  – OLCF User Conference Call
  – Perlmutter Training (Jan 5-7)
  – NVIDIA HPC SDK Training (Jan 12-13)
  – Vampir/Score-P Training (Jan 19-20)

Upcoming Scheduled Outages
  – None through Dec 24

Did You Know?

Job Step Viewer
Summit’s job launcher (jsrun) gives you a tremendous amount of control over job layout, but for many users it’s a new way of thinking about launching jobs. You can easily view how the system placed your job’s MPI ranks/threads across nodes with Job Step Viewer. JSV can also be used without an executable (i.e. by just giving jsrun options) to see how a given jsrun command would place ranks/threads. JSV provides you with a URL that you can share with colleagues to discuss/clarify proper layout for your groups’ jobs.

For more information see or For an example of the output JSV provides, see

Center Announcements

ALCC Call for Proposals
NOTE: Pre-proposals are due this Friday (December 17)!
The DOE Office of Advanced Scientific Computing Research (ASCR) is now accepting application proposals for the 2022-23 allocation year of the ASCR Leadership Computing Challenge (ALCC) program. The program provides access to computational resources at ASCR’s three supercomputing facilities (OLCF, ALCF, and NERSC).

The proposal process consists of two steps, with a pre-proposal due on December 17, 2021 and the full proposal due on February 22, 2022. The allocation period for successful proposals will run from July 1, 2022-June 30, 2023.

For more information, see the announcement at

User Assistance Center Schedule
The OLCF User Assistance Center will be closed on the following days due to ORNL-observed holidays:
Thursday, December 23
Friday, December 24
Friday, December 31

The normal user assistance schedule will be observed on other days, and the ORNL Computer Operations staff will remain available for limited troubleshooting 24 hours a day.

Meetings & Workshops

OLCF User Conference Call is Today (Dec 8)
Thanks for joining us for the December OLCF User Conference Call, which included a discussion on analysis tools at OLCF led by Benjamin Hernandez. If you would like to review the slides and/or video, please see the OLCF Training Archive or the event page for links.

Perlmutter Training (Jan 5-7)
NERSC will host Perlmutter training on Jan 5 -7 provided jointly by HPE and NERSC staff. This is a continuation and extension of the June 2021 Perlmutter Introduction training, now focused more on using Perlmutter with hands-on exercises. ALCF and OLCF users are invited to this training, and NERSC training accounts will be provided based on availability and time of registration. Registration is available via this link.

NVIDIA HPC SDK Training (Jan 12-13)
On January 12-13, NVIDIA will present a 2-day seminar for NERSC, ALCF, and OLCF users about the various GPU programming models supported by NVIDIA’s HPC SDK compilers, including Standard Language Acceleration and Libraries, OpenACC, OpenMP offload, and CUDA. The basic GPU architecture and HPC SW developer considerations and the profiling tools will also be presented. Attendees will have the opportunity to do hands-on and homework exercises on Perlmutter Phase 1 GPUs (NERSC and ALCF users) and on Summit (OLCF users). The agenda and registration form are available via this link.

Vampir/Score-P Training (Jan 19-20)
OLCF will host Vampir and Score-P training on January 19-20 from 9:00-11:30 AM EST each day. Vampir is an established performance tool for visualizing and analyzing the behavior of highly parallel HPC applications. It is supported by the Score-P tool, which can be used to fully record the runtime behavior of HPC applications. The first day will feature lessons and hands-on demos using these tools. The second day will give users an opportunity to bring their own codes and instrument them for performance analysis with help from Score-P and Vampir developers.

For the detailed agenda and registration please see

Upcoming Scheduled Outages

  • There are no outages scheduled through Friday, December 24.