GRAVIDY, a GPU modular, parallel direct-summation N-body integrator: dynamics with softening
Maureira-Fredes, Cristian1,2; Amaro-Seoane, Pau3,4,5
AbstractA wide variety of outstanding problems in astrophysics involve the motion of a large number of particles under the force of gravity. These include the global evolution of globular clusters, tidal disruptions of stars by a massive black hole, the formation of protoplanets and sources of gravitational radiation. The direct-summation of N gravitational forces is a complex problem with no analytical solution and can only be tackled with approximations and numerical methods. To this end, the Hermite scheme is a widely used integration method. With different numerical techniques and special-purpose hardware, it can be used to speed up the calculations. But these methods tend to be computationally slow and cumbersome to work with. We present a new graphics processing unit (GPU), direct-summation N-body integrator written from scratch and based on this scheme, which includes relativistic corrections for sources of gravitational radiation. GRAVIDY has high modularity, allowing users to readily introduce new physics, it exploits available computational resources and will be maintained by regular updates. GRAVIDY can be used in parallel on multiple CPUs and GPUs, with a considerable speed-up benefit. The single-GPU version is between one and two orders of magnitude faster than the single-CPU version. A test run using four GPUs in parallel shows a speed-up factor of about 3 as compared to the single-GPU version. The conception and design of this first release is aimed at users with access to traditional parallel CPU clusters or computational nodes with one or a few GPU cards.
Keywordmethods: numerical celestial mechanics stars: kinematics and dynamics
Funding ProjectRamon y Cajal Programme of the Ministry of Economy, Industry and Competitiveness of Spain ; CAS President's International Fellowship Initiative ; 'Direccion General de Investigaci on y Postgrado' (DGIP) by 'Programa Incentivo a la Iniciacion Cientifica' (PIIC) at the Universidad Tecnica Federico Santa Maria ; 'Comision Nacional de Investigacion Cientifica y Tecnologica de Chile' (CONICYT) through its Master scholarships programme ; Deutsche Forschungsgemeinschaft DFG (German Research Foundation)[Transregio 7] ; DFG Project 'Supermassive black holes, accretion discs, stellar dynamics and tidal disruptions' ; International Max-Planck Research School
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000423809400019
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Document Type期刊论文
Corresponding AuthorMaureira-Fredes, Cristian; Amaro-Seoane, Pau
Affiliation1.Albert Einstein Inst, Max Planck Inst Gravitat Phys, D-14476 Potsdam, Germany
2.Univ Tecn Federico Santa Maria, Ave Espana 1680, Valparaiso, Chile
3.IEEC, CSIC, Inst Ciencies Espai, Campus UAB,Carrer Can Magrans S-N, E-08193 Barcelona, Spain
4.Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China
5.Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Maureira-Fredes, Cristian,Amaro-Seoane, Pau. GRAVIDY, a GPU modular, parallel direct-summation N-body integrator: dynamics with softening[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(3):3113-3127.
APA Maureira-Fredes, Cristian,&Amaro-Seoane, Pau.(2018).GRAVIDY, a GPU modular, parallel direct-summation N-body integrator: dynamics with softening.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(3),3113-3127.
MLA Maureira-Fredes, Cristian,et al."GRAVIDY, a GPU modular, parallel direct-summation N-body integrator: dynamics with softening".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.3(2018):3113-3127.
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