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Meeting Minutes 2025-10-23
by Bill Gabella 23 Oct '25

23 Oct '25

Minutes for the Einstein Toolkit Meeting, 20251023 https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call 9am CDT Thursdays Present: Steve B, Deborah F, Peter D, Beyhan K, Zach E, Bill G, Leo W, Keith D, Nikolai Chair: Deborah F Minutes: Bill G * BBH gallery example (Zach) -- Leo, not done yet. * ET Server updates -- Steve, The Wiki is being updated and people at LSU. Work in progress and not ready. * EU ET school and workshop -- Beyhan, talking to people. Check-in with Zach on tutorial, title (NRPy) and request to talk about GPU Programming. Peter agrees to the TOV example, will let Beyhan know if that is any change. Deborah will send him her talk title. Registration https://sites.google.com/view/eetk25 Draft Program https://sites.google.com/view/eetk25/programme * Unanswered email https://www.einsteintoolkit.org/tools/unanswered.php Castillo email, Steve will (did) respond. Sandeep email, Looks like Roland is handling this. Difficult to see new information in long thread. Panagiotis email, Long thread with two unanswered questions, about memory (--memory?) and how to request one full node. No one seems to know about the --memory option. Steve will respond to the second point...see ini attached in the file. * Open Tickets https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=new… #2892, SpacetimeX... Liwei is helping and it is moving along. Miren has posted to the AMReX Slack. #2890, CarpetX: crash/failed... Liwei working with the same person, Miren. #2894, CarpetX: Support multipatch... Roland seems to have some questions. #2893, CarpetX: remove LEVEL=9... Group not sure what this is. Is a Pull Request. Lucas is asking for review. #2891, ExternalLIbraries/AMReX... Roland has been assigned. Very recent from Erik S. #2866, Problem while building the Et... Lucas is going to look at this; he has access to the cluster. #2889, Outflow uses incorrect... Pull Request ready to review. This is a BUG fix. * Tickets ready for review https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=open… #2894, CarpetX: Support multipatch... Roland has questions. #2893, CarpetX: remove LEVEL=9... Pull request. #2889, Outflow uses incorrect... Roland changed status to Open. Discuss next week; is a BUG fix. #2764, PUGH tries to free memory... Beyhan has not had a chance but will look at it. #963, Improve McLachlan accuracy Peter, this is ongoing and is testing this now. #2855, NoiseX: Improve noise generation... Noise generation/Random Number Generation not consistent when using the same seed. Lucas is looking at this and considering using his own implementation. o Any Other Business Next Meeting, Thursday, 30 October 2025. https://docs.einsteintoolkit.org/et-docs/Meeting_agenda CarpetX wiki https://github.com/EinsteinToolkit/CarpetX/wiki CarpetX zoom https://ubc.zoom.us/j/66033196685?pwd=zxXTpcrBY1L7nT2kNFITm71ZuoZEiO.1 FYI, bill e.g. -- Home Page <https://gabella.github.io/index.html> LinkedIn <https://www.linkedin.com/in/bill-gabella-350b016/>

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Questions about old ET releases and bundled libraries on clusters
by Omar Elías Velasco Castillo 23 Oct '25

23 Oct '25

Dear Einstein Toolkit team, I hope this message finds you well. I am a beginner with the Einstein Toolkit. On personal workstations I have been able to compile and run tutorial simulations at low resolution, but I am facing problems on two different clusters. I would like to ask two questions: 1. *Are there ET versions prior to 2022_05 (e.g. 2019–2020 releases) that can still be downloaded and compiled successfully?* When I try to fetch them from the website using ./GetComponents, the process fails (CactusSourceJar.git is not created and some components do not download). Since some of the nodes I use have older GCC versions (8 or 10) and limited modules, a stable older release might be more practical. 2. During compilation, I notice that thorns (such as GSL and HDF5, for example) fall back to using the bundled versions because system modules are not found. The build completes successfully, but jobs fail immediately after submission to PBS or SLURM queues. *What is the role of the bundled versions in this case*?* If the build uses bundled GSL/HDF5, do I still need to load corresponding, compatible modules in the runscript?* Could this mismatch explain why jobs die right after submission? Any advice on handling these issues would be very helpful. Thank you very much for your time and support. Greetings, O.V.

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 22 Oct '25

22 Oct '25

Hello, Please consider joining the weekly Einstein Toolkit phone call at 9:00 am US central time on Thursdays. For details on how to connect and what agenda items are to be discussed, use the link below. https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call --The Maintainers

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8th vs 6th order
by Rhiannon Silva 22 Oct '25

22 Oct '25

Hi, The GW150914 example parameter file uses 8th order finite differencing and I need a 6th order version for comparison in terms of both accuracy and speed. Apart from changing the finite differencing orders from 8 to 6, and I assume GlobalDerivative automatically selects the correct dissipation order since it's not specified, what would I use for the following values? Driver::ghost_size = 5 Coordinates::patch_boundary_size = 5 Coordinates::additional_overlap_size = 3 Coordinates::outer_boundary_size = 5 Carpet::prolongation_order_space = 5 Is there anything else I missed that I should change? Thank you, Rhiannon.

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Your Password is About to Expire
by Password Manager 22 Oct '25

22 Oct '25

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European Einstein Toolkit Meeting 2025
by Beyhan Karakaş 21 Oct '25

21 Oct '25

Dear Einstein Toolkit Community, We are pleased to announce that the *European Einstein Toolkit Meeting 2025* will be held *online, 1-5 December 2025*. The website of the meeting can be found here <https://sites.google.com/view/eetk25>. The meeting is open to anyone interested in the Einstein Toolkit. *Program highlights:* - Introductory lectures - Hands-on tutorials on the Einstein Toolkit - Research talks - Showcases from other numerical relativity codes - *Friday discussion session :* The Future of the Einstein Toolkit in Europe A draft programme is available on website <https://sites.google.com/view/eetk25/programme>. *Registration* is moderated and remains open throughout the meeting, but early registration is encouraged. *Abstract submission deadline:* 14 November 2025, 23:59 GMT. We look forward to seeing you at the meeting. Best regards, Beyhan. On behalf of the organising committee (Beyhan Karakas, Ian Hawke, Rahime Matur)

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 20 Oct '25

20 Oct '25

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

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Meeting minutes for 2025-10-16
by Steven Brandt 16 Oct '25

16 Oct '25

Oct 16, 2025 Present: Steve, Zach, Beyhan, Keith, Nikolai, Deborah, Peter, Leo Chair: Leo Minutes: Steve BBH gallery update for the Kruskal release has been successfully run. He has some follow-up questions. Test run by Rhiannon Silva. ET Servers: Wiki server needs updating. Working with IT staff at LSU to make this happen. European ET meeting: Dec 1-5, only virtual Unanswered questions: Steve will follow-up with Elias. 2892: From GRChombo folks. Puncture tracker is having trouble with the GPUs. Should be brought up in the CarpetX call. 2894: multipatch/IO. Next: Chair: Deborah Minutes: Bill or Lucas?

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 15 Oct '25

15 Oct '25

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 13 Oct '25

13 Oct '25

Please update the Wiki with agenda items for Thursday's meeting. Thanks! https://docs.einsteintoolkit.org/et-docs/meeting_agenda --The Maintainers

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