Hi Yosef,
I believe the code was reorganised in carpet and this needed the algorithm to change in a way that meant numerical results would change. I can't check right now, but this should have been mentioned in the announcement of the new version of carpet as well as the ET release notes.
--
Ian Hinder
ian.hinder@aei.mpg.de
----- Original message -----
> While trying to understand why the results from a BBH run
> differed when using the 2011_05 and 2011_10 version of ET
> I noticed that the two versions gave different results on every
> other point of the buffer region (in a 2 level run) on the 2nd
> time level.
>
> I reran the test using McLachlan and I found a similar
> behavior, but for fewer points (here, only 3, rather
> than 8) and only the innermost points.
>
>
> diff -w -u ~/ET/Old/Cactus/test/mc/gxx.x.asc ~/ET/Develop/Cactus/test/mc
> | grep "^[+-]2"
> -2 0 0 0 0 26 8 8 0.1 1.8 0 0 5.86163790879802
> +2 0 0 0 0 26 8 8 0.1 1.8 0 0 5.86163790879801
> -2 0 1 0 0 26 8 8 0.1 1.8 0 0 5.86163790879802
> +2 0 1 0 0 26 8 8 0.1 1.8 0 0 5.86163790879801
> -2 0 1 0 0 59 8 8 0.1 5.1 0 0 2.06954055131151
> +2 0 1 0 0 59 8 8 0.1 5.1 0 0 2.06940807802512
> -2 0 1 0 0 61 8 8 0.1 5.3 0 0 2.01672019300839
> +2 0 1 0 0 61 8 8 0.1 5.3 0 0 2.01674238678588
> -2 0 1 0 0 63 8 8 0.1 5.5 0 0 1.96875965038995
> +2 0 1 0 0 63 8 8 0.1 5.5 0 0 1.96875664800624
>
>
>
> One of the major differences between these two versions of ET is the
> switch from the git to hg version of carpet.
>
> Here is the full parfile that I used.
>
> #==============================================================================
>
> ActiveThorns = "admanalysis admbase admcoupling admmacros coordgauge
> spacemask StaticConformal boundary time cartgrid3d ioutil iobasic
> nanchecker CoordBase aeilocalinterp Slab SphericalSurface LocalReduce
> MoL Carpet CarpetInterp CarpetIOASCII CarpetLib CarpetReduce CarpetSlab
> CarpetRegrid2 SphericalSurface CarpetIOHDF5 CarpetIOScalar InitBase
> SymBase LoopControl GSL ReflectionSymmetry"
>
>
> ActiveThorns = "TimerReport"
>
> TimerReport::out_every = 512
> TimerReport::out_filename = "TimerReport"
> Carpet::output_timers_every = 512
> #------------------------------------------------------------------------------
>
> # Run parameters
> #------------------------------------------------------------------------------
>
> # Grid
>
> mol::ode_method = "RK4"
> mol::mol_intermediate_steps = 4
> mol::mol_num_scratch_levels = 1
>
>
>
> CoordBase::domainsize = "minmax"
> CoordBase::xmin = 0
> CoordBase::ymin = 0
> CoordBase::zmin = 0
> CoordBase::xmax = 10
> CoordBase::ymax = 10
> CoordBase::zmax = 10
> CoordBase::spacing = "numcells"
> CoordBase::ncells_x = 50
> CoordBase::ncells_y = 50
> CoordBase::ncells_z = 50
> CartGrid3D::type = "coordbase"
> CartGrid3D::domain = "full"
> CartGrid3D::bitant_plane = "xy"
> CartGrid3D::avoid_originx = no
> CartGrid3D::avoid_originy = no
> CartGrid3D::avoid_originz = no
>
> CoordBase::boundary_size_x_lower = 4
> CoordBase::boundary_size_y_lower = 4
> CoordBase::boundary_size_z_lower = 4
> CoordBase::boundary_shiftout_x_lower = 1
> CoordBase::boundary_shiftout_y_lower = 1
> CoordBase::boundary_shiftout_z_lower = 1
>
> CoordBase::boundary_size_x_upper = 4
> CoordBase::boundary_size_y_upper = 4
> CoordBase::boundary_size_z_upper = 4
>
> ReflectionSymmetry::reflection_x = yes
> ReflectionSymmetry::reflection_y = yes
> ReflectionSymmetry::reflection_z = yes
> ReflectionSymmetry::avoid_origin_x = no
> ReflectionSymmetry::avoid_origin_y = no
> ReflectionSymmetry::avoid_origin_z = no
>
>
>
> driver::ghost_size = 4
>
> #---------------------------------------------------------------------------
>
> cactus::cctk_itlast = 16
>
>
>
> time::dtfac = .5
> Carpet::domain_from_coordbase = yes
> Carpet::prolongation_order_space = 5
> Carpet::prolongation_order_time = 2
> Carpet::max_refinement_levels = 2
> Carpet::use_buffer_zones = yes
> Carpet::verbose = no
> Carpet::schedule_barriers = no
> Carpet::veryverbose = no
>
> CarpetLib::output_bboxes = no
> CarpetLib::check_bboxes = no
> CarpetLib::interleave_communications = yes
> CarpetLib::combine_sends = yes
>
> #Carpet::time_refinement_factors = "[1,1,1,1,2,2,4,8,16,32,64]"
> Carpet::init_3_timelevels = "no"
> Carpet::init_each_timelevel = "no"
> Carpet::init_fill_timelevels = "yes"
> Carpet::enable_all_storage = no
> Carpet::regrid_during_recovery = no
>
> ActiveThorns="CarpetRegrid2"
> CarpetRegrid2::regrid_every = 16
> CarpetRegrid2::num_centres = 1
> CarpetRegrid2::num_levels_1 = 2
> CarpetRegrid2::radius_1[ 1] = 5
>
>
> # MODEL
> ActiveThorns="IDAnalyticBH"
> ADMBase::initial_data="bl_bh"
> IDAnalyticBH::bl_nbh = 2
> IDAnalyticBH::bl_x0_1 = 1.01001
> IDAnalyticBH::bl_y0_1 = 1.01001
> IDAnalyticBH::bl_x0_2 = -1.01001
> IDAnalyticBH::bl_y0_2 = -1.01001
> initbase::initial_data_setup_method = init_some_levels
>
>
>
>
> admbase::metric_type = "Physical"
> #staticconformal::conformal_storage = "factor+derivs+2nd derivs"
>
> #--- numerics
>
>
> ActiveThorns = "ML_BSSN ML_BSSN_Helper TmunuBase GenericFD"
>
> ADMBase::evolution_method = "ML_BSSN"
> ADMBase::lapse_evolution_method = "ML_BSSN"
> ADMBase::shift_evolution_method = "ML_BSSN"
>
> ML_BSSN::timelevels = 3
>
> ML_BSSN::harmonicN = 1 # 1+log
> ML_BSSN::harmonicF = 2.0 # 1+log
> ML_BSSN::ShiftGammaCoeff = 0.75
> ML_BSSN::BetaDriver = 1.0
> ML_BSSN::LapseAdvectionCoeff = 1
> ML_BSSN::ShiftAdvectionCoeff = 1
>
> ML_BSSN::my_boundary_condition = "Minkowski"
>
> ML_BSSN::ML_log_confac_bound = "none"
> ML_BSSN::ML_metric_bound = "none"
> ML_BSSN::ML_Gamma_bound = "none"
> ML_BSSN::ML_trace_curv_bound = "none"
> ML_BSSN::ML_curv_bound = "none"
> ML_BSSN::ML_lapse_bound = "none"
> ML_BSSN::ML_dtlapse_bound = "none"
> ML_BSSN::ML_shift_bound = "none"
> ML_BSSN::ML_dtshift_bound = "none"
>
> admbase::initial_lapse = "one"
>
>
> ADMBase::initial_shift = "zero"
> ADMBase::initial_dtlapse = "zero"
> ADMBase::initial_dtshift = "zero"
>
> #------------------------------------------------------------------------------
> # Output
> #------------------------------------------------------------------------------
> IO::out_dir = $parfile
> IO::out_fileinfo = "none"
>
>
>
>
> CarpetIOASCII::out1D_every = 1
> CarpetIOASCII::out1D_vars = "admbase::alp
> admbase::metric admbase::curv admbase::shift "
> CarpetIOASCII::out1D_d=no
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