[Users] Einstein Toolkit Release

[Frank Loeffler]

We are pleased to announce the sixth release (code name "Ørsted") of the
Einstein Toolkit, an open, community developed software infrastructure
for relativistic astrophysics. This release includes various
improvements to the MHD handling within GRHydro, and improvements to the
Cactus flesh. In addition, bug fixes accumulated since the previous
release in May 2012 have been included.

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
the relativistic hydrodynamics code GRHydro (an updated and extended
version of the public release of the Whisky code). 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.

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 six 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
1212401/1212426/1212433/1212460, 0903973/0903782/0904015 (CIGR), and
also by 0905046/0941653 (PetaCactus) and 0710874 (LONI Grid).

The Einstein Toolkit contain over 170 regression test cases.  On a large
portion of the tested machines, all of these testsuites pass, using both
MPI and OpenMP parallelization.

All repositories participating in this release carry a branch ET_2012_11
marking this release.  These release branches will be updated if severe
errors are found.

For more detailed information about the "Ørsted" release please read the
long release announcement on the Einstein Toolkit web pages:
http://einsteintoolkit.org/about/releases/ET_2012_11_announcement.php.

The "Ørsted" Release Team on behalf of the Einstein Toolkit Consortium
(2012-11-08) 

Eloisa Bentivegna
Tanja Bode
Peter Diener
Roland Haas
Ian Hinder
Frank Löffler
Bruno Mundim
Christian D. Ott
Erik Schnetter

November 8, 2012

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