Task‐based parallel strategies for computational fluid dynamic application in heterogeneous CPU/GPU resources

Summary Parallel applications executing in contemporary heterogeneous clusters are complex to code and optimize. The task‐based programming model is an alternative to handle the coding complexity. This model consists of splitting the problem domain into tasks with dependencies through a directed acy...

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Bibliographic Details
Published in:Concurrency and computation Vol. 32; no. 20
Main Authors: Leandro Nesi, Lucas, da Silva Serpa, Matheus, Mello Schnorr, Lucas, Navaux, Philippe Olivier Alexandre
Format: Journal Article
Language:English
Published: Hoboken Wiley Subscription Services, Inc 25.10.2020
Subjects:
Central processing units
Computational fluid dynamics
Computer simulation
CPUs
Fluid flow
Graphics processing units
Incompressible flow
Mathematical models
Newtonian fluids
performance analysis
Run time (computers)
Task complexity
Task scheduling
task‐based programming paradigm
Toolkits
ISSN:1532-0626, 1532-0634
Online Access:Get full text
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Summary:Summary Parallel applications executing in contemporary heterogeneous clusters are complex to code and optimize. The task‐based programming model is an alternative to handle the coding complexity. This model consists of splitting the problem domain into tasks with dependencies through a directed acyclic graph, and submit the set of tasks to a runtime scheduler that maps each task dynamically to resources. We consider that computational fluid dynamics applications are typical in scientific computing but not enough exploited by designs that employ the task‐based programming model. This article presents task‐based parallel strategies for a simple CFD application that targets heterogeneous multi‐CPU/multi‐GPU computing resources. We design, develop, evaluate, and compare the performance of three parallel strategies (naive, ghost‐cells, and arrow) of a task‐based heterogeneous (CPU and GPU) application that simulates the flow of an incompressible Newtonian fluid with constant viscosity. All implementations rely on the StarPU runtime, and we use the StarVZ toolkit to conduct comprehensive performance analysis. Results indicate that the ghost cell strategy provides the best speedup (77×) considering the simulation time when the GPU resources still have available memory. However, the arrow strategy achieves better results when the simulation data increases.
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ISSN:1532-0626
1532-0634
DOI:10.1002/cpe.5772