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Gromacs for Mac OS X and Linux 4. 5. 2005

Company: Gromacs.org
Date Added: December 12, 2012  |  Visits: 286

Gromacs for Mac OS X and Linux
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GROMACS is a versatile package to perform molecular dynamics, i.e. simulate the Newtonian equations of motion for systems with hundreds to millions of particles.

It is primarily designed for biochemical molecules like proteins, lipids and nucleic acids that have a lot of complicated bonded interactions, but since GROMACS is extremely fast at calculating the nonbonded interactions (that usually dominate simulations) many groups are also using it for research on non-biological systems, e.g. polymers.

GROMACS supports all the usual algorithms you expect from a modern molecular dynamics implementation, (check the online reference or manual for details), but there are also quite a few features that make it stand out from the competition:

* GROMACS provides extremely high performance compared to all other programs. A lot of algorithmic optimizations have been introduced in the code; we have for instance extracted the calculation of the virial from the innermost loops over pairwise interactions, and we use our own software routines to calculate the inverse square root. The innermost loops are generated automatically in either C or Fortran at compile time, with optimizations adopted to your architecture. Assembly loops using SSE and 3DNow! multimedia instructions are provided for i386 processors, separate versions using all x86-64 registers are used on Opteron x86-64 and Xeon EM64t machines. This results in exceptional performance on inexpensive PC workstations, and for Pentium IV/Opteron processors there are also SSE2 double precision assembly loops. There are new manually tuned assembly loops for ia64 (both single and double precision), and last but certainly not least we have written Altivec assembly loops both for Linux and Mac OS X. Gromacs is normally 3-10 timesfaster than any other program; check the article in Journal of Molecular Modeling (reference can be found under resources) for a comparison benchmark.

* GROMACS is user-friendly, with topologies and parameter files written in clear text format. There is a lot of consistency checking, and clear error messages are issued when something is wrong. Since the C preprocessor is used, you can have conditional parts in your topologies and include other files. You can even compress most files and GROMACS will automatically pipe them through gzip upon reading.

* There is no scripting language - all programs use a simple interface with command line options for input and output files. You can always get help on the options by using the -h option, or use the extensive manuals provided free of charge in electronic or paper format. There is also an integrated graphical user interface available for all programs.

* As the simulation is proceeding, GROMACS will continuously tell you how far it has come, and what time and date it expects to be finished.

* Both run input files and trajectories are independent of hardware endian and can thus be read by any version GROMACS, even if it was compiled using a different floating-point precision.

* GROMACS can write coordinates using lossy compression, which provides a very compact way of storing trajectory data. The accuracy can be selected by the user.

* GROMACS comes with a large selection of flexible tools for trajectory analysis - you won't have to write any code to perform routine analyses. The output is further provided in the form of finished Xmgr/Grace graphs, with axis labels, legends, etc. already in place!

* A basic trajectory viewer that only requires standard X libraries is included, and several external visualization tools can read the GROMACS file formats.

* GROMACS can be run in parallel, using standard MPI communication.

Requirements: No special requirements
Release Date: December 12, 2012
Platforms: Linux, Mac OS X
Keyword: Biochemical Biological Molecular Molecules Perform
Users rating: 0/10

License: Freeware Size: 9.92 MB
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