Efficiency of parallel computations of gravitational forces by TreeCode method in N-body models

Abstract

Modeling of collisionless galactic systems is based on the N-body model, which requires large computational resources due to the long-range nature of gravitational forces. The most common method for calculating gravity is the TreeCode algorithm, which provides a faster calculation of the force compared to the direct summation of contributions from all particles for N-body simulation. An analysis of the computational efficiency is performed for models with the number of particles up to $10^8$. We considered several processors with different architectures in order to determine the performance of parallel simulations based on the OpenMP standard. An analysis of the use of extra threads in addition to physical cores shows an increase in simulation performance only when all logical threads are loaded, which doubles the total number of threads. This gives an increase in the efficiency of parallel computing by 20 percent on average.

15 pages, 11 figures

References in corpus (14)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The FLAMINGO project: cosmological hydrodynamical simulations for large-scale structure and galaxy cluster surveys
• The MillenniumTNG Project: High-precision predictions for matter clustering and halo statistics
• Fast full N-body simulations of generic modified gravity: conformal coupling models
• Global survey of star clusters in the Milky Way -- VII. Tidal parameters and mass function
• Dynamical evolution of Milky Way globular clusters on the cosmological timescale I. Mass loss and interaction with the nuclear star cluster
• Double X/Peanut Structures in Barred Galaxies -- Insights from an $N$--body Simulation
• Formation of Transitional cE/UCD Galaxies through Massive/Dwarf Disc Galaxy Mergers
• First direct identification of the barlens vertical structure in galaxy models
• Effective N-body models of composite collisionless stellar systems
• GalaxyFlow: Upsampling Hydrodynamical Simulations for Realistic Mock Stellar Catalogs
• Cluster membership analysis with supervised learning and $N$-body simulations
• Milky Way globular clusters on cosmological timescales. IV. Guests in the outer Solar System
• Formation of spiral dwarf galaxies: observational data and results of numerical simulation