People present:
Christopher Evans, Helvi Witek, Peter Diener, Steven Brandt, Roland Haas, Zach
Etienne, Maria Babiuc, Geraint Pratten
Chair: Zach Etienne
Minutes: Maria Babiuc
Zach Etienne opened the meeting.
* The first order on the agenda: official ETK representation at the
Advances in Computational Relativity workshop to be held at Brown University,
Sep 9 - Dec 11, 2020.
* Zach will attend Oct 5-9, 2020.
* Pieter Diener will be there at the opening and, although will give a
talk on self-force, can act as ETK representative. Sep 14-18, 2020.
* Other ideas on how to make ETK representation more official: add a
logo to the talks (Zach), wear T-shirts with the logo (Steve).
* The program is not out yet, but Hevli, who is in the Committee for
Math and Computational Approaches, and the scientific organizer of one of the
weeks, suggested including ETK in one of the discussion sessions, as a platform
for modeling techniques relevant to LISA and LSC.
* Second, was discussed the status of the CT_MultiLevel tests on macOS.
* Maria confirmed that tests run fine on macOS Mojave with homebrew.
* Zach mentioned he has a student who might be able to check the status
of the tests on Catalina.
* Maria will contact Ian Hinder to find out how many ETK mac users are
relying on macport.
* Zach advanced to the third item on the agenda, namely unanswered question
on mailing list and remarked that Roland is doing a terrific job in answering
any questions that arise from all users. The then moved to open tickets and
tickets in review.
* Roland had no new ticket to report, and mentioned that the reason why
tests hang on two Virtual Machines running on a MacOS 8G laptop is that too
little memory is allocated to each machine, and consequently they run out of
memory. The fix is to make sure memory doesn't get allocated.
* One other ticket Zach mentioned is that supermike fails to compile
with intel, due to an internal conflict between the new c++ compiler and
previous gcc versions. Peter mentioned that ETK runs with simfactory on
supermike2. Zach and Peter agreed to close the ticket.
* Next Zach asked and was granted the request to assign tickets to
people that volunteer.
* Next, Zach opened the conversation on the BaikalETK code, namely on how
to deal with steering parameters run-time vs compile-time, run-time being more
convenient for users.
* Zaxh proposes 2 new thorns: BaikalVac and BaikalTmunu, implementing
finite difference up to 8th order, with two kernels and more robust options for
IllinoisGRMHD. Helvi agreed, as being more manageable for users.
* Roland mentioned of possibly two more copies of the thorn in the
future, to support Llama and CCZ4.
* As future work, Zach had the idea to link scalar fields with Baikal as
well. It followed a conversation between Zach and Helvi regarding the
usefulness of public codes modeling scalar fields. The name of Katie Wright was
mentioned, who developed a purely SENR-based scalar field code.
* With this all items on the agenda were addressed. Steve wished Zach Happy
Birthday!
* Roland mentioned that testing ETK on Mac is still open to discussion.
* Maria generated visualization for her run on the binary neutron star
example and the will check for differences with the data from the ETK Gallery.
* She will open a ticket to request more explanation on the initial data
used.
* Lastly, Helvi requested an update of the chair/minute taker schedule for
the next month. A discussion followed, then Zach updated the web page
https://docs.einsteintoolkit.org/et-docs/ET_tasks_rota to reflect the updated
schedule.
Zach closed the meeting.
Happy Birthday, Zach!
_______________________
Maria C. Babiuc Hamilton, Ph.D.
Professor, Department of Physics
College of Science, Marshall University,
1 John Marshall Drive, Huntington, WV, 25755
Room S 257, Phone: (304)696-2754
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