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GENeralized-Ensemble SImulation System (GENESIS) is a molecular dynamics software mainly designed for large scale simulations of biological systems containing proteins, lipids, glycans, nucleic acids etc. It was developed in RIKEN Center for Computational Science (R-CCS), Japan.

Features
GENESIS package contains two molecular dynamics engines for different purposes: SPDYN and ATDYN. Both engines use hybrid (MPI + OpenMP) parallelism, support CPU and GPU, and share similar data structures, subroutines, and modules. SPDYN (Spatial decomposition dynamics) is developed for simulations of large systems (such as 100 million of atoms) with a speed comparable or higher than many other simulation programs by employing spatial decomposition and new parallel algorithm to increase the performance. On the other hand, ATDYN (Atomic decomposition dynamics) is very efficient for smaller systems with a code easy to understand and modify.