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Automatic termination trigger mid-run
by Jordan Nicoules 04 Jun '26

04 Jun '26

Dear all, I was wondering if there was a built-in way to trigger the termination of a simulation when something specific happens, along the lines of what Trigger does to steer quantities. From what I understand, Trigger does not offer that possibility, and TerminationTrigger checks either a file or a time limit. What I'm considering would be more along the lines of "an apparent horizon is found so trigger termination", in order to steer some parameters at recovery. If there's no such explicit way, I'm happy to try to implement that in Trigger. I actually have ideas of other small improvements to Trigger that I could try contributing as well (namely, increase the maximum number of triggers and allow one trigger to have multiple consequences at once). Unfortunately I won't be able to join the weekly call today to discuss this directly. Best, Jordan

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Question about restarting a simulation from checkpoint data
by Jorge Yahir Mio 04 Jun '26

04 Jun '26

Dear Einstein Toolkit users, I am currently working with the Einstein Toolkit and trying to use checkpoint/restart functionality to recover simulations. I understand the parameters that must be included in the parameter file, but I am not sure how I should correctly restart a simulation from existing checkpoint data. So far, I have been launching simulations with commands such as ./simfactory/bin/sim run ProcaStar -workstation-parfile=par/ProcaStar.par and the simulation runs correctly and generates checkpoint files. However, when I try to restart from the checkpoint data, I am unsure what the correct procedure should be. I do not know whether I should use a different SimFactory command, modify the submission procedure, or provide additional options. The checkpoint-related parameters in my parameter file are: CarpetIOHDF5::checkpoint = yes IOUtil::checkpoint_every_walltime_hours = 0.1 IOUtil::checkpoint_dir = "checkpoints_prueba" IOUtil::checkpoint_keep = 1 IOUtil::checkpoint_ID = no IOUtil::checkpoint_on_terminate = yes IOUtil::recover = "autoprobe" IOUtil::recover_dir = "checkpoints_prueba" IOUtil::abort_on_io_errors = yes CarpetIOHDF5::open_one_input_file_at_a_time = yes Could someone please clarify the recommended procedure for restarting a simulation from existing checkpoint files? In particular: 1. Which SimFactory command should be used to restart a simulation? 2. Is it necessary to create a new run or continue the existing one? 3. Are there any additional parameters or directory requirements for recovery to work correctly? My environment is: Einstein Toolkit version: ET_2025_05 Operating system: Linux Ubuntu 22.04.5 LTS Cluster/machine: Local Thank you very much for your help. Best regards, Yahir Mio

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Meeting Minutes for 2026-06-04
by Lucas Timotheo Sanches 04 Jun '26

04 Jun '26

Attendees: Lucas (minutes), Peter Diener, Roland Hass (chair), Beyhanm, Deborah Ferguson, Johnny Tsao, Maxwell Rizzo, Nikolai Wallin, Noora Ghadiri, Zach Etienne # ET_2026_05 release ## Gallery runs - Debporah's run: Something is wrong with the stampede build, her student ran and the trajectories were off. She's also having trouble with the derivatives - Johnny is encountering a difference when running his (Poisson equation). He says if he uses the number of processes Steve used he gets different results, if he uses 1 he gets the same results. He sees a left to right shift. Roland says that if the thing gets shifted to the right its OK, its taking a couple of iterations longer to converge. - Noora reports having some allocation issues but promises to have it done by next week. ## Test suite runners - Deborah is debuging on stampede 3. No luck yet. Will report back. - Cottonmouth fails on sunrise and cosma, but the info is outdated, thorns have had updates. The test runners will try again. - Noora reports all tests passing on frontera, but have not updated the webpage yet. - McLachlan fails on delta, queen bee and sunrise. Peter concludes it was a tolerance issue, he will update the tests and the test page. - Checkpoint failing on delta, anvil and expense. Roland asks for log files for this specific failure and will look at them. - TwoPuncturesX fails on delta. Cheng-Hsin is defending, so Lucas and Noora will coordinate to see who has more time and try to run there. ## Thorn Reviews - Bhahaha: Will have a vote next weeks for final inclusion. - CanudaX: vote in 2 weeks or after. - Cottonmouth: Zach is reviewing the Einstein Engine repo, he will have a list of updated issues soon. - Boost: Its in, some people have been using it already, no issues so far. Up for vote next week. - TwoPuncturesX: Approved, up for vote next week, # ET Workshop at UIUC - Its happening! - Total participant numbers is about 100 people, with 50 in person and 50 online - The tutorial server boss (Steve) is away so for now you are on your own. # Mailing list questions - Jordan asks about termination functionality. Roland will respond to him on the mailing list. # Tickets 2916: New issues for Cottonmouth Review. 2952: 2950: We can't do point 3 before doing point 1, because we don't have conditional storage yet. 2944: Roland suggests splitting up the issue list in more than one ticket. Because this thorn is very close to Multipole, many of the issues pointed out here should also be fixed on that thorn. 2949: C23 reserves the bool keyword, and the flesh requires some changes. 2948: Requires conditional storage.

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 03 Jun '26

03 Jun '26

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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Code Submission / Project Showcase: NOVA-Ω Lightweight Relativistic Accretion Engine
by Rodney 01 Jun '26

01 Jun '26

I wanted to share a lightweight, self-contained Python numerical simulation framework I have developed called NOVA-Ω. The project consists of two distinct 2D orbital simulation engines rendered in real-time via a highly optimized, flicker-free cell-buffer terminal matrix utilizing DEC 2026 synchronized output: 1. An Advection-Diffusion Variant: Utilizing a direct radial-velocity decay model (\(\frac{dr}{dt} \propto -r^{-2}\)) designed for fluid-like particle ring visualization. 2. A Dynamical Relativistic Variant: Integrating a true Schwarzschild-limit effective potential force calculation containing the strong-field correction term (\(-3GL^2 / r^4\)). This engine features continuous orbital energy dissipation via a localized distance-scaled drag gradient and successfully models the conservation of angular momentum by dynamically scaling the central singularity’s global spin metric (\(\Omega \)) upon event horizon ingestion. The entire framework is written in pure Python without heavy external dependencies, allowing it to execute deep strong-field physics calculations and multi-body boundary transformations in a fraction of a millisecond per frame. I believe this could serve as an excellent, lightweight educational tool, a visual toy-model for testing non-vacuum binary perturbations, or an inspiring example of optimizing terminal-based physics rendering. The public repository containing the codebases can be found here: https://github.com/skylar2kaisa-gif/NOVA--A-2D-Fluid-Velocity-Approximation… I would love to hear your thoughts, feedback, or any potential paths for integration into community educational resources. Best regards, Rodney de Rijk Lead Developer, NOVA-Ω Project

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 01 Jun '26

01 Jun '26

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 2026-05-28
by Deborah Ferguson 28 May '26

28 May '26

Present: Beyhan, Deborah, Peter, Roland, Steve, Zach, Jordan, Noora, Nimi, Maxwell, Lucas Chair: Peter Minute taker: Deborah Release: Release probably won’t be done until end of June Hopefully don’t need any more commits Current build is still broken IllinoisGRMHD “undefined reference to max” and “undefined reference to min” Zach: there was a recent merge, they used to be using a user defined max and min but switched back to standard library and removed the macro. Zach will have Leo fix it Testsuite some tests still failing for some machines developers of various thorns will look into it Gallery runs: Noora working on running Axidilaton example BBH waiting for Deborah to fix machine files for stampede3 Proposed inclusions BHahaha Peter: happy with it CanudaX Beyhan: nothing to report Lucas: no updates, will look at it again Cottonmouth: Deborah: started looking through it, nothing to report Zach: has done a couple rounds of review already and will do one more given the recent patches CapyrX deferred Boost Done TwoPuncturesX Done Tickets from Jordan issue with regex, Steve fixed it North American Einstein Toolkit Workshop and School 2026: Steve has tutorial server up and running contact Steve if you need anything ----------------------------------------- Deborah Ferguson Assistant Professor The University of Rhode Island

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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 27 May '26

27 May '26

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 25 May '26

25 May '26

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 2026-05-21
by Steven Brandt 21 May '26

21 May '26

Present: Jordan, Steve, Roland, Peter, Zach, Cheng-Hsin, Nikolai, Lucas, Deborah Chair: Zach Minute Taker: Steve Release AHFinderDirect param.ccl change approved fix in current form BHaHAHA - should have reads and writes declarations in the schedule https://bitbucket.org/llamacode/llama/pull-requests/10/diff - Question about the detJ Naming convention is confusing (Lucas), Jordan made the fix based on the expected answer for a Sphere Lucas will fix the comment Fix two typos Add --author line to commit to give Jordan credit Ticket 963: Will not make it into the release Two failing McLachlin tests on Sunrise, maybe just need to adjust the tolerances Peter will look into adjusting Running list of mandatory packages for testing: numpy *************************** * FEATURE FREEZE DECLARED * *************************** Test failures: TOVola is failing on DeltaAI and Sunrise North American Einstein Workshop and School Registration is closed Tickets: Formaline/GRHayL patch to understand symlinks "The happiest thought of my life came to me in 1907... `For an observer falling freely from the roof of a house, there exists--at least in his immediate surroundings--no gravitational field.'" - Albert Einstein (reflecting on the insight that became the equivalence principle)

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