[Users] Meeting Minutes for 2025-08-14

[Lucas Timotheo Sanches]

Present: Lucas (minutes), Steven R Brandt (chair), Peter Diener, Beyhan, Helvi
Witek, Jamie Bamber, Maxwell Rizzo, Roland Hass, Yosef Zlochower

# Hackathon post mortem

- Steve suggests that high level "how does the infrastructure works" talks may
  be useful for participants. Helvi added it as feedback for next talk.
- Steve says he is open to having the next one at LSU. Steve suggests also that
  Canada is now a possibility.

# Agenda items

- BBH gallery example. Peter has not been able to get around to it yet.
- Backports to Kruskal: Roland and Steve worked on various changes to make libs
  compile in various Linux distros. Roland reports to be testing it now on
  ACCESS clusters, and will merge it into master as soon as he is done testing.
- Helvi asked Jay, Lucas and Cheng-Hsin to give updates on the projects of the
  Hackathon:
    1. Jay: Ported Radicces M1, into a new code, called NUX. Removed GLS
    dependencies, close to having a GPU ready. Team effort, Allen, Jamie and
    Maxwell were the working forces.
    2. Cheng-Hsin: Work on adding subcycling support to CanudaX. Got it into the
    evolution thorn, but Multipole output is not being output correctly. NewRadX
    performance and profiling the codes (Liwei, Lucas and Erik).
    3. Lucas: Worked on getting higher order interpolation working on CapyrX.
    Initial tests indicate that evolution is working. He mentions wanting to
    run more tests using Multipole to see if the extracted wave forms are
    correct. He also worked on adding advective derivatives (working) and
    matter coupling (still needs work) to CottonmouthBSSN.
    4. Steve: Created a JSON-like tags system for interface files. This feature
    can improve the way information is passed to the driver and aid in Cactus
    reflection mechanisms. He also created a reflection struct, that coalesces
    all useful information that Cactus has about a grid hierarchy.

# Unanswered questions on the mailing list.

- No questions

# Tickets

- 2858: Lucas says he can try the machine files for Marenostrum. If they work
  we will add them to simfactory.
- 2867: Apparently, this happens when one does not use the SILO library that is
  distributed with the ETK. We discussed possibilities for making it work with
  spack. Roland has shared the options he uses while compiling. That may help.
- 2872: Yosef points out that the problem went away with a new version but that
  does not mean it is solved. Steve says that there is not much we can do
  unless it shows up in the current or newer versions.