[Users] Meeting minutes

[Roland Haas]

Meeting minutes:

Present were: Frank, Ian, Eloisa, Yosef, Tanja, Erik, Bruno, Roland

next ET release:

Carpet:
* will make Carpet/Hg the default version (no really big bug reports in 
a while)
* potential serious bugs:
** HDF5 1D/2D output with Multipatch (works for non-multipatch runs)
** possibly still rotatingsymmetry180
* please all run a production type run with Carpet/Hg and report back 
until next week
* test suites using checkpointing need to be regenerated since the 
checkpointing format changed. Erik says that the gut version is not able 
to read checkpoints written by the Hg version and vice versa

Simfactory:
* switch to python version
* ask GT and RIT to test it (others are already using it)

MHD:
* should be part of the release
* paper should be ready before release likely by end of month
* last outstanding issue is cylindrical blast wave test
** many MHD codes fail this test
** Bruno says that in the rarefaction region noise is generated
** divergence cleaning amplifies this noise
** Kommissarov introduces a resistive term to counteract this (just 
dissipation does not help)
** want to compare to HARM3D
** unless a solution is found soon, leave as is and refer to other codes 
(incl. Kommissarov's) also failing for justification
* want to test gauge wave MHD test (non-trivial spacetime metric rather 
than Minkoswki)
* Ian has patches to McLachlan to support additional gauges required for 
this (harmonic shift)

McLachlan:
* there is a desires to simplify the addition of new gauge conditions to 
McLachlan

Refluxing:
* thorn will be made public once the related paper has been published
* might happen before release but is not sure

Vectorization:
* supported by Kranc, switch on by default eg. in McLachlan
* needs LSUThorns/Vectors
* update wiki https://docs.einsteintoolkit.org/et-docs/Vectorisation

CCE:
* will be part of release
* add to trunk thornlis as soon as all thorns compile without errors 
(currently one thorn does not compile, Frank and Yosef will look into this)
* would like wiki page or usage guide for both extraction thorns (Yosef 
says there is documentation for the RIT parts in the standard 
documentation.tex files)
* more example files (beyond qc0)? HOWTO on how to add to own runs 
(might be in documentation already)
* would like to make the slides that Yosef and Maria will use for the 
upcoming tutorial available

miscellaneous:
* automatically run testsuites each night (using Ian's scripts)
* want testsuite for simfactory
* update documentation to reflect current status of code (incl. Cactus 
core docs), write Einstein Toolkit guide
* update/review ID wiki page 
https://docs.einsteintoolkit.org/et-docs/adding_initial_data
* provide tarball of release code
* provide virtual machine of released Cactus installation (LSU has 
experience from tutorials with this)
* maybe (probably not) provide instructions for common systems (MacOS, 
Ubuntu, Fedora, Debian, RHEL ...). Advised against since systems are too 
diverse, virtual machines are easier.

Timing of release:
* before upcoming fall workshop (dates from reminder email):
   - Oct 05th: freeze
   - Oct 12th: release

Spring workshop:
* agree on precise timing off line via email
* announce now (or very soon) to give people time to plan
* submit proposal now (or very soon) to secure funding

Fall workshop:
* Oct. 31st to Nov. 3rd  (inclusive, afternoon to noon, see Reminder email)
* topics:
** more advanced EOS, might talk to nuclear EOS community
** radiation transport (LSU focus)
** constraint transport for MHD, compare to divergence cleaning, invite 
Luis Lehner (or group member) or Bruno Giacomazzo who have implemented both
** scheduling improvements (dependencies á la Uintah)
** two track meeting: split into physics + infrastructure

Yours,
Roland

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