[Users] meeting minutes for 2022-08-18

[Roland Haas]

Present: Roland, Peter, Zach, Steve, Atul. Yosef, Beyhan, Cheng-Hsin

New contributions:

* Zach, Cheng-Hsin: NRPyElliptic, can compile with ET
* Hayley, Zach: FLRW started review, interacting, Python dependency
  removed
* Alireza, Beyhan: time constraints, will likely skip this review and
  release
* Sam, Peter: SelfForce1D checked out and compiling

Moving back to 9:00am
* accepted, no objections

gallery examples:
* BBH - Steve is working on it (simulation finished)

functionality to retire:
* Tmunu inheritance from ADMBase, StaticConformal
* REQUIRES THHORN is deprecated, Roland is replacing its use by REQUIRES
* also add CoordGauge

Messages on list:
*
http://lists.einsteintoolkit.org/pipermail/users/2022-August/008654.html is an internal Carpet issue, Roland thinks that it means that Carpet tries to copy between refinement levels with different resolution, wold need stack backtrace to see exactly where it is a called from 

*
  http://lists.einsteintoolkit.org/pipermail/users/2022-August/008649.html
  is an MPI failure on a new cluster. Roland was in contact with her,
  error message indicates a failure in MPI in reduction call. Strange
  thing is that error happens relatively late, since there should have
  been reductions before. Peter says he has seen delayed SEGFAULTs if
  one does not ask or enough memory in the submit script (#SBATCH --mem
  XXX).Beyhan notes that the output indicates that 1GB is required for
  the simulations

Open tickets:

* Zach worked on FishboneMoncrief ID thorn
  (https://bitbucket.org/einsteintoolkit/tickets/issues/2503) with
  significant updates in sympy / NRPy+. Will include improved
  integration with ADMBase's methods.
* Zach found that the proposed change can lead to slight differences
  wrt to centering
  (https://bitbucket.org/einsteintoolkit/tickets/issues/181)
* Improve McLachlan accuracy
  (https://bitbucket.org/einsteintoolkit/tickets/issues/963), Zach
  added a comment, found big improvement, Peter had looked in during
  hackathon at UIdaho, but could not find obvious change

ET conventions
* Zach brought up old code in ADMBase and non-intuitive required usage
* Yosef and Steve brought up suggested code style. Cactus has one in
  MaintGuide.pdf chapter A2 "Coding Style" (not online but in
  Cactus/docs/)

Zach suggested adding discussions on CarpetX transition to the agenda
* full transition and retirement for Carpet may be years in the future
* many thorns currently require re-implementation, adapting
* Steve mentions that for a while both stacks may need to be maintained
* Yosef suggests that if these are many small changes then these would
  be good hackathon projects
* Sam Cupp is working on porting IllinoisGRMHD to CarpetX
* Roland mentioned weekly CarpetX call Wed 9am Central Time (join
http://lists.einsteintoolkit.org/mailman/listinfo/carpetx-developers to receive Zoom invite )
* add as recurring item agenda

ET workshop in Dublin:
* no call during workshop (2 weeks from now)
* Steve, Peter, Roland in person
* Steve will present on NRPy+, will interact with Zach

Chair next week: Zach
Minutes next week: Roland (or Leo)

Yours,
Roland

-- 
My email is as private as my paper mail. I therefore support encrypting
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