BetaThorns

Thorn	Author(s)	Purpose
Cartoon2D	Sai Iyer Denis Pollney Thomas Radke David Rideout	Implements a "cartoon" axisymmetric evolution according to the method described in gr-qc/9908012. The original idea for 'Cartoon2D' was due to Steve Brandt.
HTTPD	Tom Goodale	This is a prototype C version of a web server thorn.
HTTPDExtra	unknown	not documented
IOASCIIStream	unknown	not documented

CactusBase

Thorn	Author(s)	Purpose
Boundary	Gabrielle Allen Gerd Lanfermann Miguel Alcubierre David Rideout	This thorn defines a generic interface for boundary conditions, which allows, among other things, symmetry boundary conditions associated with the grid to be applied without other thorns having knowledge of them.
CartGrid3D	Gabrielle Allen Gerd Lanfermann Joan Masso	This thorn sets up a Cartesian grid, for a given domain. It also provides a method for registering symmetries of Grid Functions across the grid axes, and a call for applying symmetry boundary conditions.
CoordBase	Cactus team	Provides generic handling of coordinates for grid variables.
IOASCII	Gabrielle Allen Tom Goodale Thomas Radke	This thorn does 1D, 2D, and 3D output of 3D variables in ASCII format.
IOBasic	Gabrielle Allen Thomas Radke	This thorn provides two I/O methods "Info" and "Scalar" which output grid variables as scalars as a function on time.
IOUtil	Gabrielle Allen Tom Goodale Thomas Radke	This thorn is the flesh for IO - it always needs to be activated if you want to do some IO in Cactus.
InitBase	Erik Schnetter	Thorn InitBase specifis how initial data are to be set up. It does not set up any initial data by itself, nor does it contain any routines which are to be called. It is merely a convenient repository remembering how initial data are to be set up, so that other thorns can check their actions against this thorn.
LocalInterp	Thomas Radke Jonathan Thornburg Erik Schnetter	This thorn does processor-local interpolation of N-dimensional data arrays. In general there may be many input arrays (all defined on the same uniform Cartesian grid) all being interpolated to the same set of interpolation points.
LocalReduce	Ravi Paruchuri Tom Goodale Yaakoub El Khamra	Local array reduction implementation, using the new local reduction API. New features added, please refer to the thorn documentation for details and to TestLocalReduce thorn for examples of usage.
MoL	Ian Hawke	This thorn provides generic time integrators. This allows clean coupling when multiple thorns wish to integrate at the same time. It also means a physics thorn doesn't have to rewrite its own time integrator. This version is designed to work with Mesh Refinement codes as well as unigrid.
SymBase	Erik Schnetter	Provide generic handling of symmetries for grids and grid arrays.
Time	Gabrielle Allen	Thorn Time sets the timestep for the simulation by either

CactusBench

Thorn	Author(s)	Purpose
BenchADM	Gabrielle Allen Authors of CactusEinstein/ADM	This thorn provides one of the key evolution methods of the Einstein Equations, to be used and optimised for benchmarking.
BenchIO	Cactus team	This thorn provides a number of benchmarking parameter files for some of the standard IO methods which the Cactus Computation Toolkit provides.

CactusConnect

Thorn	Author(s)	Purpose
HTTPD	Gabrielle Allen Tom Goodale Thomas Radke	This is a prototype C version of a web server thorn.
HTTPDExtra	Gabrielle Allen Tom Goodale Thomas Radke	This thorn registers additional HTML pages with the web server provided by thorn HTTPD.
Socket	Tom Goodale Thomas Radke John Shalf	This thorn provides platform-independent socket calls.

CactusEinstein

Thorn	Author(s)	Purpose
ADM	Gabrielle Allen Bernd Bruegmann Gerd Lanfermann Joan Masso Mark Miller Paul Walker	This thorn evolves the standard 3+1 variables using the ADM Evolution equations.
ADMAnalysis	Tom Goodale	This thorn does basic analysis of the metric and extrinsic curvature tensors.
ADMBase	Tom Goodale	This thorn provides the basic variables used to communicate between thorns doing General Relativity in the 3+1 formalism.
ADMConstraints	Gabrielle Allen Mark Miller	This analysis thorn calculates the violation in the ADM constraints using the standard Einstein variables.
ADMCoupling	Ian Hawke	The "friend of a friend" thorn to help matter / spacetime coupling. Does nothing itself.
ADMMacros	Tom Goodale	This thorn provides nothing but a load of macros for other thorns to use
AHFinder	Miguel Alcubierre	This thorn looks for apparent horizons (AH) in 3D. An AH is defined as a surface where the expansion of outgoing null geodesics is zero.
CoordGauge	Tom Goodale	Base thorn to provide the infrastructure for dynamic gauge selection.
Einstein	Cactus team	Thorn Einstein is now defunct and has been replaced with ADMBase plus other thorns: CactusEinstein/ADMAnalysis CactusEinstein/ADMBase CactusEinstein/ADMMacros CactusEinstein/CoordGauge CactusEinstein/IDSimple CactusEinstein/SpaceMask CactusEinstein/StaticConformal
EvolSimple	unknown	Simplistic evolver for the ADM equations, demonstrating the use of the CactusEinstein arrangement.
Extract	Gabrielle Allen	Calculate gauge invariant waveforms, using the Moncrief formalism, for cases when the spacetime approximates spherical symmetry.
IDAnalyticBH	Steve Brandt Carsten Gundlach Joan Masso Ed Seidel Paul Walker	This thorn calculates analytic initial data for the Einstein grid functions (lapse, shift, metric, curv) for various black hole spacetimes:
IDAxiBrillBH	Steve Brandt Paul Walker Ryoji Takahashi	This thorn calculates initial data for a black hole distorted by an even parity perturbation.
IDBrillData	Carsten Gundlach Miguel Alcubierre	Initializes Brill wave data.
IDLinearWaves	Malcolm Tobias Joan Masso	Provides analytic data for linear gravitational waves.
IDSimple	Cactus team	Simple initial data sets for 3-metric and extrinsic curvature.
Maximal	unknown	This thorn setus up the maximal slicing equation (dtrK/dt=0):
PsiKadelia	Steve Brandt John Baker Hisaaki Shinkai Paul Walker	This thorn provides a somewhat invariant means of measuring "waves" and other geometrical content in a numerically generated spacetime.
SpaceMask	Denis Pollney	Provides utilities for assigning states to individual grid points using a mask grid function.
StaticConformal	Tom Goodale	This thorn provides the variables defining a static conformal factor which is used to transform the physical metric. If this thorn is active and the ADMBase::metric_type parameter is set to `static conformal' then the ADMBase::g... variables are the conformal values as opposed to the physical values.
TimeGeodesic	Miguel Alcubierre Florian Siebel	This thorn integrates timelike geodesics. The integration is done `on the fly', that is, at the same time as the evolution of the spacetime is being calculated. The thorn can calculate geodesics either on the numerical spacetime, or on an exact spacetime (given by thorn Exact).

CactusElliptic

Thorn	Author(s)	Purpose
EllBase	unknown	This thorn does ...
EllPETSc	Cactus team	This thorn shows how PETSc can be used with the EllBase Elliptic solver interface.
EllSOR	Cactus team	This thorn provides basic elliptic solvers for different equation types using SOR iterative methods. The thorn is written to be robust and pedagogical rather that a viable fast solver.

CactusExamples

Thorn	Author(s)	Purpose
DemoInterp	Thomas Radke	This thorn demonstrates the use of the Cactus interpolation API.
FleshInfo	Cactus team	Demonstrates obtaining information about computational infrastructure from the flesh.
HelloWorld	Cactus team	Hello World example for Cactus, possibly the simplest thorn ever.
IDWaveMoL	Ian Hawke	Provides initial data for the WaveMoL thorn.
SampleBoundary	Carsten Gundlach David Rideout	This thorn provides a simple example of how to create and register a physical boundary condition. It implements a linear extrapolation boundary condition in three dimensions.
SampleIO	Thomas Radke	This thorn provides a very simple I/O method which prints the values of three-dimensional Cactus grid functions and arrays at a chosen location (selected by parameters) to screen.
TimerInfo	Cactus team	At the moment just prints out the value of all timers at chosen iteration intervals. Will be worked into a more useful thorn to report of different kinds of timing information in different ways
WaveMoL	Ian Hawke	This implements the wave equation in FOSH form for use with the Method of Lines thorn. Intended as a basic test.
WaveToy1DF77	Gabrielle Allen	This thorn illustrates the solution of the scalar wave equation in 1D using centered explicit finite differencing. Included are routines to
WaveToy2DF77	Gabrielle Allen	This thorn illustrates the solution of the scalar wave equation in 2D using centered explicit finite differencing. Included are routines to NOTE: This thorn isn't working properly yet for multiple processors, it will be fixed very soon in the development version.

CactusExternal

Thorn	Author(s)	Purpose
BLAS	Yaakoub Y El-Khamra Erik Schnetter	This thorn enables a configuration to access the BLAS library.
FFTWlib	Erik Schnetter	This thorn enables a configuration to access the FFTW library.
FlexIO	John Shalf	Thorn FlexIO provides a library for writing multidimensional data from Cactus using the IEEEIO data format. The advantage of using this library is that it is distributed with Cactus and needs no additional libraries to be installed on a machine.
GSL	Erik Schnetter	Make the GSL (GNU Scientific Library) available to Cactus thorns. See http://www.gnu.org/software/gsl.
HDF5	Yaakoub Y El-Khamra	This thorn provides a capability 'HDF5' and some utility programs to manipulate HDF5 files (independently of any Carpet or PUGH specifics).
LAPACK	Yaakoub Y El-Khamra Erik Schnetter	This thorn enables a configuration to access the LAPACK library.
LORENE	Yaakoub Y El-Khamra Erik Schnetter	This thorn enables a configuration to access the LORENE library.
PETSc	Yaakoub Y El-Khamra Erik Schnetter	This thorn adds PETSc capability to a configuration.
SDF	Thomas Radke	This thorns checks for an external SDF installation and, if one was found, provides the capability SDF.
jpeg6b	The Independent JPEG Group	This thorn contains a copy of the Independent JPEG Group's JPEG software of release 6b of 27-Mar-1998. See further details in the file src/README.

CactusIO

Thorn	Author(s)	Purpose
IOJpeg	John Shalf Gabrielle Allen Tom Goodale Gerd Lanfermann Thomas Radke	This thorn does output of 2D slices from Cactus grid functions and arrays in jpeg image format.
IOSDF	Thomas Radke	This thorn does 1D, 2D, and 3D output of grid variables in SDF file format.

CactusPUGH

Thorn	Author(s)	Purpose
PUGH	Gabrielle Allen Tom Goodale Thomas Radke Matei Ripeanu Paul Walker	This thorn provides a unigrid parallel driver with MPI.
PUGHInterp	Paul Walker Thomas Radke	This thorn implements the Cactus flesh interpolation API routine CCTK_InterpGridArrays() which provides interpolation of CCTK grid arrays at arbitrary points.
PUGHReduce	Gabrielle Allen Tom Goodale Thomas Radke	Standard reduction operators which use PUGH for communications
PUGHSlab	Gabrielle Allen Tom Goodale Thomas Radke	This thorn implements the following parts of the CCTK hyperslab API:

CactusPUGHIO

Thorn	Author(s)	Purpose
IOFlexIO	John Shalf Thomas Radke	This thorn does output of arbitrary Cactus variables in IEEEIO file format.
IOHDF5	Thomas Radke	This thorn does output of arbitrary Cactus variables in HDF5 file format.
IOHDF5Util	Thomas Radke	This thorn serves as a utility thorn for other HDF5 I/O thorns such as IOStreamedHDF5 and IOHDF5.
IOPanda	Thomas Radke	This thorn does output of 3D variables in IEEEIO format. It uses the I/O library Panda for writing files in parallel.
IOStreamedHDF5	Thomas Radke	This thorn uses the HDF5 Stream Virtual File Driver to stream HDF5 data and checkpoint files via live sockets to any connected clients.
IsoSurfacer	John Shalf	This thorn extracts isosurfaces of grid functions.

CactusTest

Thorn	Author(s)	Purpose
TestAllTypes	Erik Schnetter	Test all the variable types.
TestArrays	unknown	not documented
TestComplex	unknown	not documented
TestCoordinates	Gabrielle Allen	Test the Cactus coordinate infrastructure.
TestFortranDependencies1	Erik Schnetter	Test Fortran intra-thorn and inter-thorn make dependencies. This thorn contains the intra-thorn dependencies, and depends on the thorn TestFortranDependencies2.
TestFortranDependencies2	Erik Schnetter	Test Fortran intra-thorn and inter-thorn make dependencies. Thorn TestFortranDependencies1 depends on this thorn.
TestFpointerNULL	Thomas Radke	This thorn tests whether a Fortran routine accepts a NULL pointer reference as a function argument when called from a C function. The code should not crash as long as the NULL pointer argument isn't dereferenced.
TestFreeF90	Erik Schnetter	Test automatic line breaks in free-form Fortran 90 code.
TestGlobalReduce	Yaakoub Y El Khamra	not documented
TestInclude1	unknown	not documented
TestInclude2	unknown	not documented
TestLocalReduce	unknown	not documented
TestReduce	unknown	not documented
TestSchedule	Rion Dooley	This thorn is used to test that all schedule bins are executed.
TestStrings	Cactus team	Test use of strings in Cactus. At the moment:
TestTable	Jonathan Thornburg	This thorn contains a test driver for the Cactus key/value tables API, Util_Table*().
TestTimers	Cactus team	This thorn demonstrates and tests the use of Timers in thorns.
TestTypes	Erik Schnetter	Test most of the variable types.

CactusUtils

Thorn	Author(s)	Purpose
NaNChecker	Thomas Radke	This thorn can be used to analyze CCTK variables of real or complex data type for NaN (Not-a-Number) and (on availability of finite(3)) infinite values.
TimerReport	Cactus team	Simplistic additional timer information. This thorn provides timer details to screen at different iterations and before checkpoints depending on parameter settings.

CactusWave

Thorn	Author(s)	Purpose
IDScalarWave	Tom Goodale Gabrielle Allen	This thorns sets initial data for the scalar wave equation evolver
IDScalarWaveC	Tom Goodale Gabrielle Allen Werner Benger	This thorn sets initial data for the scalar wave equation evolver.
IDScalarWaveCXX	Tom Goodale Gabrielle Allen Werner Benger	This thorns sets initial data for the scalar wave equation evolver
IDScalarWaveElliptic	unknown	not documented
WaveBinarySource	Gerd Lanfermann	Provides a source term to the scalar field evolution for two rotating binary charges.
WaveToyC	Gabrielle Allen Tom Goodale	This thorn solves the linear wave equation.
WaveToyCXX	unknown	not documented
WaveToyExtra	Cactus team	Additional functionality for the WaveToy example
WaveToyF77	Tom Goodale	This thorn solves the linear wave equation
WaveToyF90	Tom Goodale	This thorn solves the linear wave equation
WaveToyFreeF90	Tom Goodale Erik Schnetter	This thorn solves the linear wave equation, using free form (as opposed to fixed form) Fortran 90.