[Users] Meeting Minutes 2021-04-15

Gabella, William E b.gabella at Vanderbilt.Edu
Thu Apr 15 10:35:18 CDT 2021

Present: Roland H, Bill G, Ken S, Peter D, Karim S, Steve B, Atul K,
Indrani B, Erik S, Zach E, Maria H, Miguel G

Chair: Roland H, Minutes: Bill G

* SPEC benchmark contribution 
[https://bitbucket.org/einsteintoolkit/tickets/issues/2470 task] [RH, SB]

Steve, no new news.

* ET 2021 summer workshop 
date selection]

Roland, another virtual only ETK meeting this summer hosted by
NCSA.  Trying to avoid other large meetings.  Fill out the spreadsheet
in the mailing list and linked on the above for conflicts.  A full week,
5 days and 1/2 day for the school in the morning likely. Schedule:
Votes 8 of 13 are yes for August 16-20.  And July 12 to 16, 4 yes's
and 2 no.  July 26-30, 7 yes and 1 no.  August 16-20 and July 26-30
seem more preferred.  Check with LIGO meetings and make an
announcement within the week.

Roland, collecting ideas for lecture topics.  You as a user or other
people that would like to hear about ETK and basics like Num Rel
by Helvi, and hydrohynamics and magneto-hydrodynamics.  Steve
will give intro tutorial.  Yosef on writing a more advanced ETK thorn.
Still in brainstorming phase so please send emails.  Erik, would
like Wave Extraction and a bit of theory behind it, generic how to
analyze the data that come out of the ETK, and how to read them
into Python or Mathematica and what you can do with it.  Roland,
Also thinking about KuiBit, or Ian Hinder's tools, and Wolfgang's
PostCactus.  How to use and to program in them.

Roland, Presentations, getting input from numerical astrophysics
groups, AMRex, Charm++, etc.  Athena version with full GR in it.
Erik, consider GR 1D by Connor, black hole formation with hydro
but cannot handle black hole itself.  Roland, idea is to have the
competition give a presentations.

Atul, last years meeting there was desire for Lorene tutorial / 
Maria agrees.  Lorene with ETK and not the independent one. Roland,
read data or construct data?  RIT on constructing and reading is the
thorn.  Maria, would like how to integrate with tabulated EOS, and using
it.  Construction of initial data with various EOS in the ETK, in all the
various forms for the EOS.  Roland will contact Josh Faber (RIT) to ask
about the construction of EOS, and to ask if they would show us how
to use the generated data in the toolkit.

Will also have Lightning talks, 7 + 2 minutes.

* release planning [ZE]

** release [http://einsteintoolkit.org/testsuite_results/index.php 
testsuite status]

[https://docs.einsteintoolkit.org/et-docs/Release_Details Release Details]

Zach, one month before Gallery examples need to be tested---
Feature Freeze May 15th.  Steve, not tested BBH example recently,
but running testsuites, QBC, Deep Bayou, and generic linuxes...
about 15 hydro tests do not pass QBC and DB---assertion error in
con2prim, maybe not unusual, see on other systems (discussed
last week too).  These are all Intel compiler and not GCC.
Discussion of QB which mostly passes, QBC with failures, and Deep
Bayou with failures between Steve and Roland.  Looks like the
Intel 19 compiler might be in common with the failures.

Gallery examples after the feature freeze definitely.  Testers
should test the example earlier if you have not run it recently.
There are tickets for each of the examples.  "Testing each
example" tickets will be put in the details; see link above and
"Gallery Example volunteers" section.

* [http://blackholesathome.net/ BlackHoles at Home] & the Toolkit [ZE]

Zach, giving the APS talk on Sunday and in preparation the
BlackHoles at Home website is updated, and code validation has
been added.  Runs binary BH on a desktop computer, and presents
the gallery example from the ETK.  Details there on what he did.
Perfect agreement for l=2, but less so for l=4 because of high
frequency gauge mode bouncing off of refinement levels.
BH at Home does not use the symmetry about the z=0 plane.
Can have resolution in different directions independently.  Would
like to link to the ETK in library form, interpolation to small
cartesian grid patch over to the toolkit as a library to get isolated
and apparent horizons from ETK.  Has a proof of principle with
Roland in Bitbucket using ETK as a library.  So ETK will be in
BH at Home to do this code verification and comparison.

Steve, BH at Home the users running them do not know what sims
they are running?  Zach, trying to be very transparent with the
users, no visualization yet.  Goal is 1M of time in an hour on a
desktop.  Have two servers with good 10GB fiber lines for
receiving the data and large storage 70 TB---with 20k users in
mind.  Postdoc on client-server interface working.  Linux and
Mac versions are good, but Windows is a bit more difficult.
Looking to launch in August of 2021.  Checkpointing and resuming
from checkpointing for now.  Setting up jobs from the server and
passing them out to clients and resuming when a desktop
disappears off the net.

[https://www.einsteintoolkit.org/tools/unanswered.php unanswered 
question on mailing list]


open tickets sorted by update time]

Compiling on MacOS resolved or partially so in private emails.

tickets ready for review]


Erik, do we follow up on those who try ETK?  Do we know why they
leave?  Can we help more?  Maybe a questionnaire after a few
days---the "onboarding process."  Maybe two questionnaires, one
when they register and another a few days after the start using it.
Is there an Outreach section in someone's grant for resources?

Roland, we currently do not follow-up.  Record of emails and hash
of emails in the login...which we could figure out.

Steve, have been getting many membership and tutorial requests
in the last days.  Anyone teaching or running tutorials using ETK?
No one knows of any.

William Gabella
Research Assistant Professor
Department of Physics and Astronomy
Nashville, TN USA
(o) 615-343-2713

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