[Users] ET Simulation Error

MAKINO Taiki makino.taiki.g6 at s.mail.nagoya-u.ac.jp
Mon Jun 15 19:00:00 CDT 2026


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


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