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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 22 Jun '26

22 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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Slides of 2026 North American Einstein Toolkit Workshop and School
by Helvi Witek 22 Jun '26

22 Jun '26

Dear all, thank you to all of you who attended the 2026 North American Einstein Toolkit Workshop and School last week, and helped making the meeting a success. The slides of the talks are now available on our workshop website: https://etksummerschool2026.illinois.edu/program-2/ The 2027 North American Einstein Toolkit Workshop and School will be hosted by Zach Etienne at the University of Idaho; with dates TBA. Best wishes Helvi (on behalf of the organizers Noora Ghadiri, Jay Kalinani, Maxwell Rizzo, Helvi Witek) --------------------------------------------- Dr. Helvi Witek Associate Professor Department of Physics University of Illinois at Urbana-Champaign 247 Loomis Lab 1110 W Green St Urbana, IL 61801 ---------------------------------------------

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No Einstein Toolkit Meeting Reminder
by Roland Haas 17 Jun '26

17 Jun '26

Hello all, Due to the 2026 US ET summer school and workshop there will not be an Einstein Toolkit phone call on Thursday. 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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Re: [Users] ET Simulation Error
by Beyhan Karakaş 16 Jun '26

16 Jun '26

Date: Tue, 16 Jun 2026 00:00:00 +0000 > From: MAKINO Taiki <makino.taiki.g6(a)s.mail.nagoya-u.ac.jp> > To: "users(a)einsteintoolkit.org" <users(a)einsteintoolkit.org> > Subject: [Users] ET Simulation Error > > > Dear Einstein Toolkit Team > > I am a new Einstein Toolkit user and have a simulation error. > > I can run DNSdata_test.par with GRHydro, but I cannot run it when I switch > GRHydro to IllinoisGRMHD. In detail, I changed the activethorns from > GRHydro to IllinoisGRMHD, and added some activethorns such as GRHayLib, > GRHayL and GRHayLHD. > > In addition, I commented out parameters of GRHydro like > ?GRHydro::sources_spatial_order?. And, I wrote HydroBase::evolution_method > = "IllinoisGRMHD?. The error message is as follows: > > ?WARNING level 0 from host hubble process 22 > in thorn Cactus, file > /data/usr/Cactus/configs/sim/build/Cactus/main/SetParams.c:93: > -> CCTKi_SetParameter: Error at line 36 in parameter file > /data/usr/sim_Result/test_BNS_GW_Piecewise4_Cactus_Illinois8/output-0000/DNSdata_test.par > while activating thorns? > > Also, one of participants of the Einstein Toolkit workshop advised that I > had to activate DNSdata which I had commented out and to comment out > parameters of thorns which I did not activate. After making these changes, > a different error appeared. It is the following: > > WARNING level 0 from host hubble process 0 > in thorn Cactus, file > /data/usr/Cactus/configs/sim/build/Cactus/main/SetParams.c:93: > -> CCTKi_SetParameter: Error at line 37 in parameter file > /data/makino/test_BNS_GW_Piecewise4_Cactus_Illinois9/output-0000/DNSdata_test_copy.par > while activating thorns. > > The list of activated thorns is provided below for reference: > > ActiveThorns = "Boundary CartGrid3D CoordBase Fortran InitBase IOUtil > LocalReduce SymBase Time" > ActiveThorns = "AEILocalInterp" > ActiveThorns = "MoL Slab SpaceMask SphericalSurface" > ActiveThorns = "Carpet CarpetInterp CarpetInterp2 CarpetIOASCII > CarpetIOHDF5 CarpetIOScalar CarpetLib CarpetIOBasic CarpetReduce > CarpetRegrid2 CarpetSlab CarpetTracker CarpetMask LoopControl" > ActiveThorns = "Formaline" > ActiveThorns = "HTTPD Socket" > ActiveThorns = "NaNChecker TerminationTrigger TimerReport" > ActiveThorns = "ADMbase ADMcoupling ADMmacros CoordGauge StaticConformal" > ActiveThorns = "RotatingSymmetry180 ReflectionSymmetry" > ActiveThorns = "Constants TmunuBase HydroBase " > ActiveThorns = "QuasiLocalMeasures" > ActiveThorns = "EOS_Omni" > ActiveThorns = "GRHayLib" > ActiveThorns = "GRHayL" > ActiveThorns = "IllinoisGRMHD" > ActiveThorns = "SummationByParts" > ActiveThorns = "GenericFD NewRad" > ActiveThorns = "ML_BSSN ML_BSSN_Helper ML_ADMConstraints" > ActiveThorns = "Hydro_Analysis" > ActiveThorns = "Dissipation" > ActiveThorns = "DNSdata" > ActiveThorns = "GRHayLHD? > > > The line reported in the second error (line 37) corresponds to: > > ActiveThorns = "GRHayLHD" > > Am I missing any required thorns, parameter settings, or something else > for using IllinoisGRMHD with DNSdata_test.par? > > Thank you very much for your time and assistance. > > I have attached the parameter file for reference. If any additional > information would be helpful, I would be happy to provide it. > > Best regards, > > Taiki Makino > Graduate School of Science, Nagoya University > makino.taiki.g6(a)s.mail.nagoya-u.ac.jp > > Dear Taiki, You should remove the GRHayL from the active thorns as the thorn name is GRHayLib for that. And you don't need HydroBase::evolution_method = "IllinoisGRMHD" for IGM. You activate both IGM and GrHaylHD you should choose one. Please have a look at the example parfiles: Cactus/arrangements/GRHayLET/IllinoisGRMHD and also in Cactus/arrangements/GRHayLET/GRHayLHD. Best regards, Beyhan.

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ET Simulation Error
by MAKINO Taiki 15 Jun '26

15 Jun '26

Dear Einstein Toolkit Team I am a new Einstein Toolkit user and have a simulation error. I can run DNSdata_test.par with GRHydro, but I cannot run it when I switch GRHydro to IllinoisGRMHD. In detail, I changed the activethorns from GRHydro to IllinoisGRMHD, and added some activethorns such as GRHayLib, GRHayL and GRHayLHD. In addition, I commented out parameters of GRHydro like “GRHydro::sources_spatial_order”. And, I wrote HydroBase::evolution_method = "IllinoisGRMHD”. The error message is as follows: “WARNING level 0 from host hubble process 22 in thorn Cactus, file /data/usr/Cactus/configs/sim/build/Cactus/main/SetParams.c:93: -> CCTKi_SetParameter: Error at line 36 in parameter file /data/usr/sim_Result/test_BNS_GW_Piecewise4_Cactus_Illinois8/output-0000/DNSdata_test.par while activating thorns” Also, one of participants of the Einstein Toolkit workshop advised that I had to activate DNSdata which I had commented out and to comment out parameters of thorns which I did not activate. After making these changes, a different error appeared. It is the following: WARNING level 0 from host hubble process 0 in thorn Cactus, file /data/usr/Cactus/configs/sim/build/Cactus/main/SetParams.c:93: -> CCTKi_SetParameter: Error at line 37 in parameter file /data/makino/test_BNS_GW_Piecewise4_Cactus_Illinois9/output-0000/DNSdata_test_copy.par while activating thorns. The list of activated thorns is provided below for reference: ActiveThorns = "Boundary CartGrid3D CoordBase Fortran InitBase IOUtil LocalReduce SymBase Time" ActiveThorns = "AEILocalInterp" ActiveThorns = "MoL Slab SpaceMask SphericalSurface" ActiveThorns = "Carpet CarpetInterp CarpetInterp2 CarpetIOASCII CarpetIOHDF5 CarpetIOScalar CarpetLib CarpetIOBasic CarpetReduce CarpetRegrid2 CarpetSlab CarpetTracker CarpetMask LoopControl" ActiveThorns = "Formaline" ActiveThorns = "HTTPD Socket" ActiveThorns = "NaNChecker TerminationTrigger TimerReport" ActiveThorns = "ADMbase ADMcoupling ADMmacros CoordGauge StaticConformal" ActiveThorns = "RotatingSymmetry180 ReflectionSymmetry" ActiveThorns = "Constants TmunuBase HydroBase " ActiveThorns = "QuasiLocalMeasures" ActiveThorns = "EOS_Omni" ActiveThorns = "GRHayLib" ActiveThorns = "GRHayL" ActiveThorns = "IllinoisGRMHD" ActiveThorns = "SummationByParts" ActiveThorns = "GenericFD NewRad" ActiveThorns = "ML_BSSN ML_BSSN_Helper ML_ADMConstraints" ActiveThorns = "Hydro_Analysis" ActiveThorns = "Dissipation" ActiveThorns = "DNSdata" ActiveThorns = "GRHayLHD” The line reported in the second error (line 37) corresponds to: ActiveThorns = "GRHayLHD" Am I missing any required thorns, parameter settings, or something else for using IllinoisGRMHD with DNSdata_test.par? Thank you very much for your time and assistance. I have attached the parameter file for reference. If any additional information would be helpful, I would be happy to provide it. Best regards, Taiki Makino Graduate School of Science, Nagoya University makino.taiki.g6(a)s.mail.nagoya-u.ac.jp 取得 Outlook for Mac<https://aka.ms/GetOutlookForMac>

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meeting minutes for 2026-06-11
by Roland Haas 11 Jun '26

11 Jun '26

Present: Roland, Steve, Peter, Max, Deborah, Noora, Yuvraj, Zach Chair: Deborah Minutes: Roland ET release ========== * timeline * gallery ** BBH test gives large CoM drift on either Stampede3 or Unity ** needs to be checked, would be critical for release ** suggest to try 2025 version of TwoPunctures * Noora is running axidilaton gallery example now * testsuites ** Derivs tests fail with error code 255, finds NaN but only for order 4 and higher * sunrise failures, may be due to postprocessing code. Seems fixable by removing a line of code ** CanudaX has significant differences ** SpherePUGH has differences * votes for final inclusion next meeting: CanudaX, Cottonmouth, Boost, TwoPuncturesX (post investigation of BBH gallery issues) * votes for inclusion that passed: Bhahaha, BHNS gallery example ET summer school and workshop ============================= * If presenting a tutorial, please send any notebooks / data you would like to use to Steve ASAP, by uploading to the tutorial server and pointing him to the location * data files can be hosted in your $HOME, make sure to set permissions, `chmod -R ugo+rX $HOME` 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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Einstein Toolkit Meeting Reminder
by users＠einsteintoolkit.org 10 Jun '26

10 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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Silo Compilation Error
by Leonardo Werneck 09 Jun '26

09 Jun '26

Hi all, I've been trying to improve GRHayL's CI, and while trying to build the Einstein Toolkit's master thornlist in a container image, I got the following error: ``` #11 1164.3 ../../../tools/silock/silock.c: In function ‘updateProgress’: 29704 #11 1164.3 ../../../tools/silock/silock.c:183:20: error: storage size of ‘timeZone’ isn’t known 29705 #11 1164.3 183 | struct timezone timeZone; 29706 #11 1164.3 | ^~~~~~~~ 29707 #11 1164.3 make[7]: *** [Makefile:540: silock.o] Error 1 29708 #11 1164.3 make[6]: *** [Makefile:486: all-recursive] Error 1 29709 #11 1164.3 make[5]: *** [Makefile:545: all-recursive] Error 1 29710 #11 1164.3 make[4]: *** [Makefile:477: all] Error 2 29711 #11 1164.3 make[3]: *** No rule to make target '/opt/et-build/et-gcc/configs/sim/scratch/done/Silo', needed by 'silo.cxx.o'. Stop. 29712 #11 1164.3 make[2]: *** [/opt/et-build/et-gcc/lib/make/make.thornlib:113: make.checked] Error 2 29713 #11 1164.3 make[1]: *** [/opt/et-build/et-gcc/lib/make/make.configuration:179: /opt/et-build/et-gcc/configs/sim/lib/libthorn_Silo.a] Error 2 29714 #11 1164.3 make[1]: *** Waiting for unfinished jobs.... ``` It appears that `struct timezone` is legacy C. Has anyone encountered this before and/or know how to deal with it? I've been using the latest gcc on Ubuntu 24.04, for completeness. Thanks! Leo

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Agenda for Thursday's Meeting
by users＠einsteintoolkit.org 08 Jun '26

08 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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Question about schedule options
by Jordan Nicoules 05 Jun '26

05 Jun '26

Hi all, I have a question about scheduling routines in the analysis bin, more particularly about the options you can provide. Is there any downside in scheduling a function as "global-early loop-local", compared to the default "local"? Like a loss of performance, for instance if there end up being multiple such functions without non-trivial order? My issue is, Trigger::Trigger_Check is scheduled as global-early, but I would like to compute GFs before (and reductions, but that is not the problematic part). The "before" directive seems to only properly apply if I make my routine "global-early loop-local", which I can understand. If there's no additional overhead, I don't mind changing the options of my routine. If it may turn out to have impact on performance, I may prefer to introduce conditional statements or find other workarounds. Best, Jordan

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