Release Announcement

We are pleased to announce the thirteenth release (code name "Brahe") of the Einstein Toolkit, an open, community developed software infrastructure for relativistic astrophysics. This release includes, among other things, updates to the IllinoisGRMHD code, updated requirements concerning C++, and updates examples in the gallery. In addition, bug fixes accumulated since the previous release in November 2015 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 magneto-hydrodynamics code GRHydro. For parts of the toolkit, 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 magneto-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 (Einstein Toolkit), and also by 0905046/0941653 (PetaCactus) and 0710874 (LONI Grid).

The Einstein Toolkit contains about 200 regression test cases. On a large portion of the tested machines, almost all of these test suites pass, using both MPI and OpenMP parallelization.

The changes between this and the previous release include:

  • Larger changes since last release
  • Cactus Flesh
    • Enable C++11 by default, and require it to be supported
    • External libraries can specify additional paths (only) added as include path for Fortran.
    • The 'checkout' target of 'make' has been removed, as it only supported cvs, was unused and untested for a long time.
  • IllinoisGRMHD/Convert_to_HydroBase: major update
  • SetMask_SphericalSurface: modify criterion for setting the mask to avoid problems with intermittent apparent horizon finder failures
  • More examples in the Einstein Toolkit Gallery
  • Simfactory
    • New configurations: acrcluster, centos, cori, minerva, sunnyvale
    • Updates to several machines (too many to list)
    • stampede: fix core affinity settings
  • New thorns or tools
    • New thorn WatchDog: a thorn that terminates jobs that do not make progress over a user-defined time frame, defined as time in between ANALYSIS steps.
  • How to upgrade from Somerville (ET_2015_11)

To upgrade from the previous release, use GetComponents with the new thornlist to check out the new version. Switching to the new branch is not possible for most repositories due to repository moves.

See the Download page on the Einstein Toolkit website for download instructions.

  • Remaining issues with this release
  • Certain machines need to be configured specially in Simfactory because the remote directories cannot be determined automatically just from the user name. See the Machine notes below.
  • Recovering with Carpet: Carpet stores metadata (such as the simulation time) only for Carpet::max_timelevels time levels, although it is possible to allocate more time levels. These additional time levels then cannot be recovered; the symptom is an assertion failure during recovery. The solution is to either increase Carpet::max_timelevels, or to decrease the number of active time levels.
  • Machine notes

Supported (tested) machines include:

  • Default Debian, Ubuntu, Fedora, CentOS, and MacOS installations
  • Bethe
  • Bluewaters
  • Comet
  • Datura
  • Fionn
  • Gordon
  • GPC
  • Gullimin
  • MP2
  • Nvidia
  • Queenbee 2
  • Shelob
  • Supermike II
  • Stampede (CPU)
  • Titan
  • Zwicky
  • Stampede: defs.local.ini needs to have sourcebasedir = $WORK and basedir = $SCRATCH/simulations configured for this machine. You need to determine $WORK and $SCRATCH by logging in to the machine.

All repositories participating in this release carry a branch ET_2016_05 marking this release. These release branches will be updated if severe errors are found.

The "Brahe" Release Team on behalf of the Einstein Toolkit Consortium (2016-06-15)

   Steven R. Brandt
   Peter Diener
   Roland Haas
   Ian Hinder
   Frank Löffler
   Bruno C. Mundim
   Erik Schnetter
   Barry Wardell

June 16, 2016