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Petascale turbulence simulation using a highly parallel fast multipole method on GPUs

Rio Yokota, L.A. Barba, Tetsu Narumi, Kenji Yasuoka
2013 Computer Physics Communications  
The simulations use a vortex particle method to solve the Navier-Stokes equations, with a highly parallel fast multipole method (FMM) as numerical engine, and match the current record in mesh size for  ...  The particle-based simulations presented in this paper quantitatively match the kinetic energy spectrum obtained with a pseudo-spectral method, using a trusted code.  ...  Introduction In the history of using computer simulation as a research tool to study the physics of turbulence, the dominant approach has been to use spectral methods.  ... 
doi:10.1016/j.cpc.2012.09.011 fatcat:zdbjrn6ga5cmlkcw7mlo77kif4

Hierarchical N-body Simulations with Autotuning for Heterogeneous Systems

Rio Yokota, Lorena Barba
2012 Computing in science & engineering (Print)  
These features are a requirement to developing a black-box software library for fast N-body algorithms on heterogeneous systems, which is our immediate goal.  ...  With the current hybridization of treecodes and FMMs, combined with auto-tuning capabilities on heterogeneous architectures, the flexibility of fast N-body methods has been greatly enhanced.  ...  Acknowledgements We're grateful for the support from the US National Science Foundation and the Office of Naval Research. Recent grant numbers are NSF OCI-0946441, and ONR award #N00014-11-1-0356.  ... 
doi:10.1109/mcse.2012.1 fatcat:qhfjkfnvtfde5iguma5b4gb2fm

FMM-based vortex method for simulation of isotropic turbulence on GPUs, compared with a spectral method

Rio Yokota, L.A. Barba
2013 Computers & Fluids  
The fact that it uses the fast multipole method (FMM)--a hierarchical algorithm for N-body problems with highly scalable parallel implementations--as numerical engine makes it a potentially good candidate  ...  This paper presents a comparison between a Lagrangian vortex method and a pseudo-spectral method for the simulation of decaying homogeneous isotropic turbulence.  ...  We acknowledge the use of the hit3D pseudospectral DNS code for isotropic turbulence, and appreciate greatly their authors for their open-source policy; the code is available via Google code at http://  ... 
doi:10.1016/j.compfluid.2012.08.002 fatcat:5ukhafrvkndg3gynpey5ygq4ey

Abstractions and Middleware for Petascale Computing and Beyond

Ivo F. Sbalzarini
2010 International Journal of Distributed Systems and Technologies  
As high-performance computing moves to the petascale and beyond, a number of algorithmic and software challenges need to be addressed.  ...  Together, these developments cause several growing gaps in parallel HPC: 1. the performance gap: the actual sustained performance of scientific simulation codes is a decreasing fraction of the theoretical  ...  In summary, the abstractions and middleware presented in this paper provide a starting point that has already led to highly scalable and easy-to-implement parallel simulations .  ... 
doi:10.4018/jdst.2010040103 fatcat:yihhihij7rblbo3jzknckjeglu

Literature Review of Accelerated CFD Simulation Methods towards Online Application

Md Lokman Hosain, Rebei Bel Fdhila
2015 Energy Procedia  
As a next step one of these methods will be implemented and coupled to CFD simulation of cooling impinging jets used to control the heat transfer and temperature behavior of a hot flat surface in a hot  ...  They provide high accuracy however, the simulation time is too long and this limit its generalized use dramatically as for control purposes.  ...  Recently, a petascale turbulence near real-time simulation was done by Yokota, R., et. al., in [25] using GPU architecture.  ... 
doi:10.1016/j.egypro.2015.07.714 fatcat:cb5vmlvhjfhr7mxf2iq45hlqca

ATIP/A*CRC Workshop on Accelerator Technologies for High-Performance Computing: Does Asia Lead the Way? Programme Handbook [article]

Michalewicz Marek, Kahaner David
2012 Zenodo  
It is an opportune time to analyze the current state-ofthe- art accelerated HPC architectures from an Asian perspective and experience, including practical issues of use, code development, and performance  ...  We believe it will be a very fulfilling two days with the presentations covering a wide spectrum of the accelerated HPC practice.  ...  Raj THAMPURAN Executive Director, SERC, A*STAR All speakers and participants All Sponsors All staff who made this conference possible.  ... 
doi:10.5281/zenodo.3977457 fatcat:v2aftckqinasxk5ugdw27vinpa

A second golden age of aeroacoustics?

S. K. Lele, J. W. Nichols
2014 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
We attempt to discern where the future might take us, especially if exascale computing becomes a reality in 10 years.  ...  This review traces the progress in large-scale computations to resolve the noise-source processes and the methods devised to predict the far-field radiated sound using this information.  ...  In the hybrid CAA approach, computation of the aeroacoustic integrals used for propagating to the farfield can be accelerated by the wideband multi-level fast multipole method [33] , which falls into  ... 
doi:10.1098/rsta.2013.0321 pmid:25024417 fatcat:vi65p3wu4bat7d3fffvftvbvlq

Simulation of Fusion Plasmas: Current Status and Future Direction

D A Batchelor, M Beck, A Becoulet, R V Budny, C S Chang, P H Diamond, J Q Dong, G Y Fu, A Fukuyama, T S Hahm, D E Keyes, Y Kishimoto (+17 others)
2007 Plasma Science and Technology  
Acknowledgments: This work is supported in part by the US DoE Contract No. DE-AC02-76CH03073 [1] http://tokamak-profiledb.ukaea.org.uk/  ...  The parameters of these methods are exposed upon demand and the methods are typically highly configurable.  ...  Recently this difficult problem has been solved [Sovinec04] by using a semi-implicit scheme, a high order finite element method, and parallel computing.  ... 
doi:10.1088/1009-0630/9/3/13 fatcat:qultg3zae5dqtcyqm6lktxgdve

Exascale applications: skin in the game

Francis Alexander, Ann Almgren, John Bell, Amitava Bhattacharjee, Jacqueline Chen, Phil Colella, David Daniel, Jack DeSlippe, Lori Diachin, Erik Draeger, Anshu Dubey, Thom Dunning (+39 others)
2020 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
As noted in Wikipedia, skin in the game refers to having 'incurred risk by being involved in achieving a goal', where 'skin is a synecdoche for the person involved, and game is the metaphor for actions  ...  For exascale applications under development in the US Department of Energy Exascale Computing Project, nothing could be more apt, with the skin being exascale applications and the game being delivering  ...  The authors would like to extend a special thanks to the many computer and computational science researchers (hundreds of them) who have committed their time, talents, experience and passion to the ECP  ... 
doi:10.1098/rsta.2019.0056 pmid:31955678 fatcat:6gijc65k2fa5lirhdkiudbie5q

Solvers for O (N) Electronic Structure in the Strong Scaling Limit [article]

Nicolas Bock and Matt Challacombe and Laxmikant V. Kalé
2015 arXiv   pre-print
We present a hybrid OpenMP/Charm++ framework for solving the O (N) Self-Consistent-Field eigenvalue problem with parallelism in the strong scaling regime, P≫N, where P is the number of cores, and N a measure  ...  Comput. 35 C72, 2013], and involves a recursive, task-parallel algorithm, often employed by generalized N-Body solvers, to occlusion and culling of negligible products in the case of matrices with decay  ...  [93] , Fast High-dimensional Kernel Summations Using the Monte Carlo Multipole Method, in Advances in Neural Information Processing Systems (NIPS) 21 (Dec 2008), MIT Press,  ... 
arXiv:1403.7458v7 fatcat:75dqzyl2xbflhdvh5x6zsmfasq

PIC methods in astrophysics: Simulations of relativistic jets and kinetic physics in astrophysical systems [article]

Kenichi Nishikawa, Ioana Dutan, Christoph Köhn, Yosuke Mizuno
2021 arXiv   pre-print
Finally, we give an outlook of the future simulations of jets associated to neutron stars, black holes and their merging and discuss the future of PIC simulations in the light of petascale and exascale  ...  We review a plethora of astrophysical phenomena such as relativistic jets, instabilities, magnetic reconnection, pulsars, as well as PIC simulations of laser-plasma physics (until 2021) emphasizing the  ...  Simulations were performed using Pleiades and Endeavor facilities at NASA Advanced Supercomputing (NAS: s2004), using Comet at The San Diego Supercomputer Center (SDSC), Bridges at The Pittsburgh Supercomputing  ... 
arXiv:2008.02105v3 fatcat:5uttdaqnrjekbemtgaxwliafua

Simulating the Cosmic Dawn with Enzo [article]

Michael L. Norman, Britton Smith, James Bordner
2018 arXiv   pre-print
Using simulations of increasing size and complexity, working up in length and mass scale and to lower redshifts, a connected narrative is built up covering the entire epoch.  ...  We review two decades of progress using the Enzo hydrodynamic cosmology code to simulate the Cosmic Dawn, a period of roughly 1 billion years beginning with the formation of the first stars in the universe  ...  We are considering implementing other approaches for gravity, such as the Fast Multipole Method, which have excellent scaling properties [Jabbar et al., 2014] .  ... 
arXiv:1810.03179v1 fatcat:3hxrv47yxvhalnsbshs7s72mqi

Simulating the Cosmic Dawn With Enzo

Michael L. Norman, Britton D. Smith, James Bordner
2018 Frontiers in Astronomy and Space Sciences  
Using simulations of increasing size and complexity, working up in length and mass scale and to lower redshifts, a connected narrative is built up covering the entire epoch.  ...  We review two decades of progress using the Enzo hydrodynamic cosmology code to simulate the Cosmic Dawn, a period of roughly 1 billion years beginning with the formation of the first stars in the universe  ...  ENZO and YT are developed by a large number of independent researchers from numerous institutions around the world. Their commitment to open science has helped make this work possible.  ... 
doi:10.3389/fspas.2018.00034 fatcat:jkdscnzz2zgc3f6jcozzkn2tca

Accelerated application development: The ORNL Titan experience

Wayne Joubert, Rick Archibald, Mark Berrill, W. Michael Brown, Markus Eisenbach, Ray Grout, Jeff Larkin, John Levesque, Bronson Messer, Matt Norman, Bobby Philip, Ramanan Sankaran (+2 others)
2015 Computers & electrical engineering  
To ready applications for accelerated computing, a preparedness effort was undertaken prior to delivery of Titan.  ...  However, programming these systems for high performance, performance portability and software maintainability has been a challenge.  ...  Acknowledgments The CAAR project was a large-scale effort requiring the participation of many individuals.  ... 
doi:10.1016/j.compeleceng.2015.04.008 fatcat:ir4nljoznvfvrbg3vdcjtggxc4

WHITE DWARF MERGERS ON ADAPTIVE MESHES. I. METHODOLOGY AND CODE VERIFICATION

Max P. Katz, Michael Zingale, Alan C. Calder, F. Douglas Swesty, Ann S. Almgren, Weiqun Zhang
2016 Astrophysical Journal  
This is the first paper in a series describing simulations of these systems using a hydrodynamics code with adaptive mesh refinement.  ...  To date there have been relatively few self-consistent simulations of merging white dwarf systems using mesh-based hydrodynamics.  ...  Section 3 describes the method we use for setting up a binary white dwarf simulation.  ... 
doi:10.3847/0004-637x/819/2/94 fatcat:p5xaktcrgncsjdcoyyrp6buxgm
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