Last revised December on 29, 2013
GRACOS is a software package (code)
including a fast executable
for cosmological N-body simulations and data analysis.
GRACOS was developed at
and later at
under the advice of
Prof. Edmund Bertschinger.
The latest bugfix version gracos-9211-AA is now available (download it, or see the release notes for news).
GRACOS has been used to:
Generate first three dimensional computer simulation of cosmological caustics: Thesis.
Establish the effects of primordial non-gaussianities on large scale cosmological structure formation:
Explore the halo assembly bias in hierarchical superclaster structure formation:
Standard GNU build and install procedure
Embedded script environment
Cosmological initial conditions generator, including non-gaussian initial conditions
Particle data imager and mass density power spectrum estimator
Particle position and velocity integrator with a choice between KDK and DKD integration schemes; Plummer force softening
File input and output in multiple serial and one distributed data formats
Parallelization with Message Passing Interface (MPI) environment
Version specific documentaition in HTML and PDF formats included in each distribution
Free software, released under the GNU General Public License (GPL).
The manual for GRACOS is available
online and in PDF
Technical description of the main
optimization techniques specially developed for GRACOS:
parallel domain decomposition with Hilbert curve, sorting, and the adaptive P3M
are presented in Chapters 2 and 3 of Alexander
Shirokov PhD Thesis at MIT (submitted
in March 2005). Chapter 2 is also
available as astro-ph/0505087.
If you wish to cite GRACOS in your work we recommend the above two publications BibTeX.
If you have comments, questions, or suggestions regarding GRACOS, please feel free to contact us.
- WSHAPE: Force softening laws for gravitational simulations of continuous media and point masses using adaptive mass resolution.
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