Added support for multiple time-stepping#
A two-level multiple time-stepping scheme has been implemented. Any combination of five different force groups can be selected to evaluate less frequently, thereby improving performance.
Extend supported use-cases for GPU version of update and constraints#
GPU version of update and constraints can now be used for FEP, except mass and constraints free-energy perturbation.
Reduce time spent in grompp with large numbers of distance restraints#
The time gmx grompp spent processing distance restraint has been changed from quadratic in the number of restraints to linear.
Support for offloading PME to GPU when doing Coulomb FEP#
PME calculations can be offloaded to GPU when doing Coulomb free-energy perturbations.
CPU SIMD accelerated implementation of harmonic bonds#
SIMD acceleration for bonds slightly improves performance for systems with H-bonds only constrained or no constraints. This gives a significant improvement with multiple time stepping.
Allow offloading GPU update and constraints without direct GPU communication#
Allow domain-decomposition and separate PME rank parallel runs to offload update and constraints to a GPU with CUDA without requiring the (experimental) direct GPU communication features to be also enabled.
Tune CUDA short-range nonbonded kernel parameters on NVIDIA Volta and Ampere A100#
Recent compilers allowed re-tuning the nonbonded kernel defaults on NVIDIA Volta and Ampere A100GPUs which improves performance of the Ewald kernels, especially those that also compute energies.