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Meeting Minutes for 2025-06-17
by Lucas Timotheo Sanches 17 Jul '25

17 Jul '25

Present: Steven Brandt, Lucas T. Sanches (minutes), Beyhan Karakas, Zach Etienne (chair), Roland Haas, Peter Diener, Leo Rosa Werneck, Keith Dow. # Remaining BBH gallery example - Peter reports no progress yet. # Tickets - 2877: Zach reports having created this ticket as a TODO list for BHaHAHA, including but not limited to horizon pickup: This finds the horizon again if it is lost. - 2874: Zach suggests assigning this ticket to Leo, since he created the code. - 2879: Petsc update is now ready. - 963: Zach will create a mirror ticket to have Baikal's BSSN improvements as well. - 2282: Zach reports that this is fixed. Using the midpoint rule is the way. - 2878: Lucas was asked to add a reviewer to the ticket. - 2848: Zach suggested that this should be closed. Roland said that maybe not, since there are still issues with the random number generator. Roland suggested closing this and opening a new one ticket for the RNG.

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Meeting Minutes for 2025-07-10
by Leo Rosa Werneck 17 Jul '25

17 Jul '25

Hi all, Here are the minutes from last week’s ET call. Cheers, Leo Present: Steve (Chair), Leo (Minutes), Roland, Beyhan, Lucas, Peter, Keith, Maxwell **ET Release** - BBH gallery example, past 2 releases: no update. - MacLachlan gallery example needs updating, but not ready yet. **Unanswered Questions on Mailing List** None. **Open Tickets & Tickets Ready for Review** - #2878: Pending Erik's review and approval. - #2875: Steve will review. - #2874: Leo will work on it. ------ Leonardo R. Werneck, Ph.D. Postdoctoral researcher Office EP 314 | Department of Physics | University of Idaho 875 Perimeter Dr. MS 0903 Moscow, ID 83844-0903, USA leonardo(a)uidaho.edu <mailto:leonardo@uidaho.edu> https://leowerneck.github.io <https://leowerneck.github.io/>

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 16 Jul '25

16 Jul '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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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 14 Jul '25

14 Jul '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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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 09 Jul '25

09 Jul '25

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Postdoc position in gravitational waves theory, Jena, Germany
by Sebastiano Bernuzzi 08 Jul '25

08 Jul '25

Dear Colleague, there is a postdoc opportunity in Jena; I would appreciate it if you forward this message to potential candidates. Applications are invited for a postdoctoral research position at the Friedrich-Schiller-Universitaet Jena. The appointment is associated with the research group of Prof. Sebastiano Bernuzzi at the Theoretical Physics Institute. The selected candidate is expected to work on the project “GROOVHY: Gravitational radiation from black holes’ hyperbolic mergers”, which is funded by the Deutsche Forschungsgemeinschaft (DFG). The project’s workplan spans effective-one-body models for hyperbolic and generic-orbit binary black hole mergers, numerical-relativity and test-body perturbative simulations, and Bayesian data analysis of non-circularized black hole mergers. The project is embedded in an ongoing scientific effort on gravitational-wave science and modeling of multimessenger signals. The successful candidate has the opportunity to join the international Virgo, LISA and/or Einstein Telescope collaborations. The Jena group is also part of the computational relativity (CoRe) collaboration. Applications should be received by *August 1st, 2025*, but will be considered until the position is filled. The appointment is for one year and should start in April 2026. An extension may be possible depending on finding availability. Electronic applications with subject “Application for PD position – SURNAME NAME” should be send to: sebastiano.bernuzzi[AT]uni-jena.de Please attach a single PDF with a cover letter, a curriculum vitae with a list of publications, a brief description of research interests, and a list of three potential referees, who may be contacted separately. LINK: https://www.physik.uni-jena.de/en/2405/jobs S.Bernuzzi

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 07 Jul '25

07 Jul '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 2025-07-03
by Roland Haas 03 Jul '25

03 Jul '25

Present: Leo, Roland, Peter, Beyhan, Keith, Wei Sun, Zach gallery examples ================ * still lacking updates for BBH gallery example for 2025_05 and 2024_11 gcc15 failures ============== * Zach suggested to compile ET with newest flavor of compilers regularly * Roland mentions that we could have a weekly build using the new compiler using github, Ubuntu 25.04 has gcc15, Zach suggests there may even be a gcc-latest or so image Benchmarking GRHayLHD simulations ================================= * Wei, Zach and Leo discussed results of benchmarking a GRHayLHD simulation for optimal speed varying ranks and threads * tests were done on NERSC Perlmutter (CPU only) * suggest to try both with and without IO enabled * suggest to check mpirun options to have correct affinity to cores / numa-nodes etc. Yours, Roland -- My email is as private as my paper mail. I therefore support encrypting and signing email messages. Get my PGP key from http://pgp.mit.edu .

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Problems with output in CarpetX
by Javiera Hernández Morales 03 Jul '25

03 Jul '25

Hi all, I am starting to learn the use of CarpetX and for this I started using the WaveToyX thorn. I wanted to ask for guidance for three problems that I have encountered so far, all of them related to the output data: 1) I wanted to get 3D data, for example in .tsv format. Here I realised that there is an ambiguous definition in the documentation for the parameter “out_tsv”, which in section 12.1 it says to control TSV output and have default value “yes”, but in section 14 it says to control the 3D output in TSV and have default value “no”. This last behaviour is the one that I encounter when running the parfiles. 2) When I set up “out_tsv" to “yes” and “out_tsv_every” to a number, for example = 16, I get 1D output every 16 iterations, but 3D output in every iteration, therefore I suspect that “out_tsv_every” is only controlling the frequency of the 1D output, and I cannot find a way to control the frequency of 3D output. 3) I attempted to output data in HDF5 format but I did not succeed. I first set the parameter “openpmd_format” to “HDF5” and also set “out_openpmd_vars” to the variables that I wanted, but I got an error in the first iteration: INFO (CarpetX): OutputGH: iteration 0, time 0.000000, run time 1 s INFO (CarpetX): OutputOpenPMD... INFO (CarpetX): Creating openPMD object... INFO (CarpetX): options: { "adios2": { "dataset": { "operators": [ ] } } } [et-juphub:699479] *** An error occurred in MPI_Comm_create_keyval [et-juphub:699479] *** reported by process [211877889,2] [et-juphub:699479] *** on communicator MPI_COMM_WORLD [et-juphub:699479] *** MPI_ERR_ARG: invalid argument of some other kind [et-juphub:699479] *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort, [et-juphub:699479] *** and potentially your MPI job) [et-juphub:699473] PMIX ERROR: UNREACHABLE in file ../../../src/server/pmix_server.c at line 2193 [et-juphub:699473] 3 more processes have sent help message help-mpi-errors.txt / mpi_errors_are_fatal [et-juphub:699473] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages Simfactory Done at date: Thu 26 Jun 2025 09:19:08 AM UTC And I did not know how to move on from there. I am working on the ETK Tutorial server, in case that is important. Thanks in advance to anyone who took the time to read until here, I will be looking forward to any piece of advice :) Best, Javiera H.M.

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 02 Jul '25

02 Jul '25

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