Recent developments in the general atomic and molecular electronic structure system

Area of Science:

• Computational Chemistry
• Quantum Chemistry
• Materials Science

Background:

• GAMESS (General Atomic and Molecular Electronic Structure System) is a widely used computational chemistry software.
• LibCChem is the associated C++ library enabling parallel and GPU computations.
• Advancements in computational power necessitate efficient algorithms and hardware utilization.

Purpose of the Study:

• To present recently implemented features in GAMESS and LibCChem.
• To discuss the integration of advanced computational methods and hardware accelerators.
• To provide insights into the maintenance and future development of the software suite.

Main Methods:

• Implementation of fragmentation methods (FMO, EFP, EFMO).
• Development of hybrid MPI/OpenMP approaches for Hartree-Fock calculations.
• Inclusion of resolution of the identity (RI) second-order perturbation theory (MP2).
• Addition of new coupled cluster theory methods.
• Integration of multiple levels of density functional theory (DFT) and tight-binding (TB) theory.
• Exploration of graphical processing unit (GPU) acceleration via LibCChem.

Main Results:

• Successful implementation of diverse fragmentation techniques for large molecular systems.
• Enhanced performance for Hartree-Fock calculations using hybrid parallelization.
• Accurate and efficient electronic structure calculations through RI-MP2 and advanced coupled cluster methods.
• Expanded capabilities with DFT and TB methods for various chemical problems.
• Demonstrated utility of GPUs for accelerating complex quantum chemistry computations.

Conclusions:

• The latest GAMESS and LibCChem versions offer significant improvements in computational efficiency and methodology.
• The strategic use of accelerators like GPUs is crucial for tackling increasingly complex chemical problems.
• Ongoing development and maintenance ensure the continued relevance and power of the GAMESS software suite.