We are pleased to announce the second release (code name "Chandrasekhar") of the Einstein Toolkit, an open, community developed software infrastructure for relativistic astrophysics. This release is mainly a maintenance release incorporating fixes accumulated since the previous release in June 2010, as well as additional test suites.
The Einstein Toolkit is a collection of software components and tools for simulating and analyzing general relativistic astrophysical systems that builds on numerous software efforts in the numerical relativity community including CactusEinstein, the Carpet AMR infrastructure and on the public version of the Whisky hydrodynamics code (now modified and called GRHydro). The Cactus Framework is used as the underlying computational infrastructure providing large-scale parallelization, general computational components, and a model for collaborative, portable code development. The toolkit includes modules to build complete codes for simulating black hole spacetimes as well as systems governed by relativistic hydrodynamics. Current development in the consortium is targeted at providing additional infrastructure for general relativistic magnetohydrodynamics.
The Einstein Toolkit uses a distributed software model and its different modules are developed, distributed, and supported either by the core team of Einstein Toolkit Maintainers, or by individual groups. Where modules are provided by external groups, the Einstein Toolkit Maintainers provide quality control for modules for inclusion in the toolkit and help coordinate support. The Einstein Toolkit Maintainers currently involve postdocs and faculty from five different institutions, and host weekly meetings that are open for anyone to join in.
Guiding principles for the design and implementation of the toolkit include: open, community-driven software development; well thought out and stable interfaces; separation of physics software from computational science infrastructure; provision of complete working production code; training and education for a new generation of researchers.
For more information about using or contributing to the Einstein Toolkit, or to join the Einstein Toolkit Consortium, please visit our web pages at <http://einsteintoolkit.org>.
The Einstein Toolkit is primarily supported by NSF 0903973/0903782/0904015 (CIGR), and also by NSF 0701566/0855892 (XiRel), 0721915 (Alpaca), 0905046/0941653 (PetaCactus) and 0710874 (LONI Grid).
This release comprises the following tools, arrangements, and thorns. Each tool/arrangement/thorn may have its own licencing conditions, but all are available as open source. Green components are new in this release, shown in red are components now not longer part of the Einstein Toolkit:
CactusBase Standard Cactus thorns CactusConnect CactusElliptic CactusExternalNot part of the Einstein Toolkit anymore (use ExternalLibraries/libjpeg instead of jpeg6b)CactusIO CactusNumerical new: InterpToArray CactusPUGH CactusPUGHIO CactusTest Various Cactus testsuite thorns CactusUtils CactusWave Wavetoy example thorns
ExternalLibraries Interfaces to external libraries (new: OpenSSL, libjpeg, several updates in other thorns)
Carpet Adaptive mesh refinement
EinsteinAnalysis Einstein Toolkit EinsteinBase EinsteinEOS EinsteinEvolve EinsteinInitialData EinsteinUtils
McLachlan BSSN implementation
TAT/TATelliptic Various thorns AEIThorns/AEILocalInterp LSUThorns/QuasiLocalMeasures LSUThorns/SummationByParts
Kranc Automated code generation
GetComponents Downloading tools and thorns
SimFactory Building code and running simulations
All repositories participating in this release carry a branch ET_2010_11 marking this release. These release branches will be updated if severe errors are found.
This release has been tested on the following systems and architectures:
The Einstein Toolkit thorns contain 132 regression test cases. While all test cases pass on some systems, there are unfortunately also some systems where certain test cases fail. We verified that this is because of accumulation of floating-point round-off error in most cases, and we will discuss this issue in a broader context in the near future.
The Einstein Toolkit web site contains online documentation for its thorns, and pointers for using it to build your own code. There is also a tutorial that explains how to download, build, and run the code for a simple binary black hole evolution. We invite you to join our mailing list <firstname.lastname@example.org>.The changes between this and the previous release include (not complete):
On behalf of the Einstein Toolkit Consortium: the "Chandrasekhar" Release Team
Christian D. Ott
November 23, 2010