In This Message

Center Announcements
  – Annual GPU Hackathon Series
  – Building Containers on Summit
  – User Assistance Center Schedule
  – Smoky Mountain Conference Data Challenge 2022

Meetings & Workshops
  – HPC Best Practices Webinar (Apr 13)
  – Appentra Codee Training (Apr 26-27)
  – April OLCF User Conference Call: myOLCF Self-Service Portal (Apr 27)

Upcoming Scheduled Outages
  – Slate (Onyx on April 18, Marble on April 20-21)

Center Announcements

Annual GPU Hackathon Series
Do you have an application that needs to be ported to (or optimized on) GPUs? If so, why not work toward your GPU development goals surrounded by experts in the field? Each year, the OLCF works with NVIDIA and other GPU hackathon partners to deliver a series of hackathons around the world. During the events, teams (3 or more members) work alongside mentors with GPU programming expertise to port or optimize their codes on GPUs.

For more information about these events, please visit or, if you are already familiar with the events, you can visit and click “Hackathons” to see the list of upcoming events. Look for the OLCF logo for the OLCF-sponsored hackathons.

Building Containers on Summit
Building container images is now possible on Summit! Users can build a container image with Podman, convert it to a Singularity Image File (SIF) format, and run the container using the Singularity runtime. The full workflow is detailed at

User Assistance Center Schedule
The OLCF User Assistance Center will be closed on Friday, April 15 due to an ORNL-observed holiday. The normal user assistance hours will resume on Monday, April 18. The Computer Operations staff will remain available for limited troubleshooting 24 hours a day.

Smoky Mountain Conference Data Challenge 2022
This data analytics competition provides an opportunity to tackle scientific data challenges that come from eminent datasets related to ORNL, industry, and academia . These datasets come from scientific simulations and instruments in physical and chemical sciences, electron microscopy, bioinformatics, engineering, materials science, neutron sources, urban development, and other areas, and will have open research questions and tasks for participants to solve. Competitors have till July 7 to solve one of the challenges and write a paper about their approach. Selected solutions to these challenges will be published in the SMC2022 proceedings in a CCIS Springer volume. Career Researchers and Students compete in different categories. Learn more about the SMCDC22 at

Meetings & Workshops

HPC Best Practices Webinar (Apr 13)
The IDEAS Productivity project, in partnership with the DOE Computing Facilities of the ALCF, OLCF, and NERSC and the DOE Exascale Computing Project (ECP) run a webinar series on Best Practices for HPC Software Developers. The April webinar will be presented by JaeHyuk Kwack of Argonne National Laboratory and is titled Evaluating Performance Portability of HPC Applications and Benchmarks Across Diverse HPC Architectures. The webinar will take place on Wednesday, April 13, 2022 at 1:00 pm ET. The webinar is free and open to the public, but registration is required and is available at For more information, see

Appentra Codee Training (Apr 26-27)
NERSC will host training on Appentra’s Codee Analyzer (formerly known as Parallelware Analyzer) on Tuesday, April 26 and Wednesday, April 27 from noon until 3:00 PM (EDT) each day. Appentra Codee Analyzer is a programming development tool for C/C++/Fortran parallel codes on multicore CPUs and GPUs using OpenMP and OpenACC. It provides a systematic, more predictable approach that leverages parallel programming best practices, and enables the novice to write codes at the level of experts, including inserting OpenMP/OpenACC directives to offloading to accelerator devices like GPUs. This training is focused on how the Codee tool provides automated code inspection capabilities for assisting OpenMP/OpenACC programming on GPUs. OLCF and ALCF users are invited and NERSC training accounts will be provided if needed. To register, see

April OLCF User Conference Call: myOLCF Self-Service Portal (Apr 27)
The April OLCF User Conference Call will be held from noon until 1:00 PM Eastern Time on Wednesday, April 27. During this call, OLCF’s Leah Huk will provide an overview of myOLCF, including new features such as the ability to monitor user support tickets. For more information, see the event page at

Upcoming Scheduled Outages

  • Work will be performed on Onyx from 8:00 AM until 8:00 PM on Monday, April 18 and on Marble from 8:00 AM on Wednesday, April 20 until 8:00 AM on Thursday, April 21. During these times, Jupyter notebooks will be restarted, so in-flight processing will be halted but the notebook state will be stored. Otherwise, workflows should migrate between servers in the respective clusters and user impact is not anticipated.