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Fast fragments: The development of a parallel effective fragment potential method

✍ Scribed by Heather M. Netzloff; Mark S. Gordon

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
336 KB
Volume
25
Category
Article
ISSN
0192-8651

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✦ Synopsis

Abstract

The Effective Fragment Potential (EFP) method for solvation decreases the cost of a fully quantum mechanical calculation by dividing a chemical system into an ab initio region that contains the solute plus some number of solvent molecules, if desired, and an “effective fragment” region that contains the remaining solvent molecules. Interactions introduced with this fragment region (for example, Coulomb and polarization interactions) are added as one‐electron terms to the total system Hamiltonian. As larger systems and dynamics are just starting to be studied with the EFP method, more needs to be done to decrease the calculation time of the method. This article considers parallelization of both the EFP fragment‐fragment and mixed quantum mechanics (QM)‐EFP interaction energy and gradient computation within the GAMESS suite of programs. The iteratively self‐consistent polarization term is treated with a new algorithm that makes use of nonblocking communication to obtain better scalability. Results show that reasonable speedup is achieved with a variety of sizes of water clusters and number of processors. © 2004 Wiley Periodicals, Inc. J Comput Chem 25: 1926–1935, 2004

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