[Users] ET Simulation Error

[Beyhan Karakaş]

Date: Tue, 16 Jun 2026 00:00:00 +0000

> From: MAKINO Taiki <makino.taiki.g6 at s.mail.nagoya-u.ac.jp>
> To: "users at einsteintoolkit.org" <users at 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 at 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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