|
| programming language = [[Fortran]], [[C (programming language)|C]]
| operating system = [[Microsoft Windows|Windows]], [[OS X]], [[Linux]]
| platform = [[x86]], [[x86-64]]
| size =
| language = English
| website = {{URL|classic.chem.msu.su/gran/gamess}}
}}
'''Firefly''', formerly known asnamed PC GAMESS, is an [[ab initio quantum chemistry methods|ab initio]] [[computational chemistry]] program for [[Intel]]-compatible [[x86]], [[x86-64]] [[Microprocessor|processor]]s based on [[GAMESS (US)]] sources. However, it has been substantiallymostly rewritten (about 60-70% of the code), especially in platform-specific parts ([[memory allocation]], disk [[input/output]], [[computer network|network]]), [[mathematic]] functions (e.g., [[matrixMatrix operation(mathematics)|matrix]]s operations), and [[quantum chemistry|quantum chemical]] methods (such as [[Hartree–FockHartree–Fock method]], [[Møller–PlessetMøller–Plesset perturbation theory]], and [[density functional theory]]). ThereforeThus, it is significantly faster than the original GAMESS. The main maintainer of the program is Alex Granovsky. Since October 2008, the project is no longer associated with [[GAMESS (US)]] and the Firefly namerename was createdoccurred. Until October 17, 2009, both names could be used, but thereafter, the package should be referred to as Firefly exclusively.<ref name="bare_url">[http://classic.chem.msu.su/gran/gamess/ Firefly Home Page]</ref>
As ofOn December 4, 2009, the support of any PC GAMESS versions earlier than the first PC GAMESS Firefly version 7.1.C is beingwas abandoned, and any and all licenses to use the code arewere revoked. Thus, users of the outdated PC GAMESS binaries (version 7.1.B and all earlier releases) arewere required to discontinue their use ofusing the PC GAMESS and upgrade to Firefly.<ref name="bare_url" />
AOn July 25, 2012, a state of the art edition of Firefly, has been launched as Firefly v.version 8.0.0 RC, onwas July 25, 2012launched for public beta testing. A relative comparison has shown that it is far faster and more reliable than itsthe prior edition, Firefly v. 7.1.G. Many changes have beenwere made to enhance its abilities.
==See also==
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