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research-article

Legion: expressing locality and independence with logical regions

Authors:

Sean Treichler,

Elliott Slaughter,

Alex AikenAuthors Info & Claims

SC '12: Proceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis

Article No.: 66, Pages 1 - 11

Published: 10 November 2012 Publication History

Abstract

Modern parallel architectures have both heterogeneous processors and deep, complex memory hierarchies. We present Legion, a programming model and runtime system for achieving high performance on these machines. Legion is organized around logical regions, which express both locality and independence of program data, and tasks, functions that perform computations on regions. We describe a runtime system that dynamically extracts parallelism from Legion programs, using a distributed, parallel scheduling algorithm that identifies both independent tasks and nested parallelism. Legion also enables explicit, programmer controlled movement of data through the memory hierarchy and placement of tasks based on locality information via a novel mapping interface. We evaluate our Legion implementation on three applications: fluid-flow on a regular grid, a three-level AMR code solving a heat diffusion equation, and a circuit simulation.

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Cited By

Feng GXie JDong DLu Y(2024)UNR: Unified Notifiable RMA Library for HPCProceedings of the International Conference for High Performance Computing, Networking, Storage, and Analysis10.1109/SC41406.2024.00111(1-15)Online publication date: 17-Nov-2024
https://dl.acm.org/doi/10.1109/SC41406.2024.00111
S. F. X. Teixeira THenzinger AYadav RAiken AMohror KArnold DBadia R(2023)Automated Mapping of Task-Based Programs onto Distributed and Heterogeneous MachinesProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis10.1145/3581784.3607079(1-13)Online publication date: 12-Nov-2023
https://dl.acm.org/doi/10.1145/3581784.3607079
Shiina STaura KMohror KArnold DBadia R(2023)Itoyori: Reconciling Global Address Space and Global Fork-Join Task ParallelismProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis10.1145/3581784.3607049(1-15)Online publication date: 12-Nov-2023
https://dl.acm.org/doi/10.1145/3581784.3607049
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Legion: expressing locality and independence with logical regions

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Legion: Expressing locality and independence with logical regions
SC '12: Proceedings of the 2012 International Conference for High Performance Computing, Networking, Storage and Analysis

Modern parallel architectures have both heterogeneous processors and deep, complex memory hierarchies. We present Legion, a programming model and runtime system for achieving high performance on these machines. Legion is organized around logical regions,...
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Information & Contributors

Information

Published In

cover image ACM Conferences

SC '12: Proceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis

November 2012

1161 pages

ISBN:9781467308045

General Chair:
Jeffrey K. Hollingsworth
University of Maryland

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Publisher

IEEE Computer Society Press

Washington, DC, United States

Publication History

Published: 10 November 2012

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SC '12

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SIGHPC
SIGARCH
IEEE-CS

SC '12: International Conference for High Performance Computing, Networking, Storage and Analysis

November 10 - 16, 2012

Utah, Salt Lake City

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SC '12 Paper Acceptance Rate 100 of 461 submissions, 22%;

Overall Acceptance Rate 1,516 of 6,373 submissions, 24%

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Cited By

Feng GXie JDong DLu Y(2024)UNR: Unified Notifiable RMA Library for HPCProceedings of the International Conference for High Performance Computing, Networking, Storage, and Analysis10.1109/SC41406.2024.00111(1-15)Online publication date: 17-Nov-2024
https://dl.acm.org/doi/10.1109/SC41406.2024.00111
S. F. X. Teixeira THenzinger AYadav RAiken AMohror KArnold DBadia R(2023)Automated Mapping of Task-Based Programs onto Distributed and Heterogeneous MachinesProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis10.1145/3581784.3607079(1-13)Online publication date: 12-Nov-2023
https://dl.acm.org/doi/10.1145/3581784.3607079
Shiina STaura KMohror KArnold DBadia R(2023)Itoyori: Reconciling Global Address Space and Global Fork-Join Task ParallelismProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis10.1145/3581784.3607049(1-15)Online publication date: 12-Nov-2023
https://dl.acm.org/doi/10.1145/3581784.3607049
Bauer MSlaughter ETreichler SLee WGarland MAiken ADehnavi MKulkarni MKrishnamoorthy S(2023)Visibility Algorithms for Dynamic Dependence Analysis and Distributed CoherenceProceedings of the 28th ACM SIGPLAN Annual Symposium on Principles and Practice of Parallel Programming10.1145/3572848.3577515(218-231)Online publication date: 25-Feb-2023
https://dl.acm.org/doi/10.1145/3572848.3577515
Caheny PAlvarez LCasas MMoreto MWolf FShende SCulhane CAlam SJagode H(2022)TD-NUCAProceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis10.5555/3571885.3571991(1-15)Online publication date: 13-Nov-2022
https://dl.acm.org/doi/10.5555/3571885.3571991
Ramos EWhite SBhosale AKale L(2022)Runtime Techniques for Automatic Process VirtualizationWorkshop Proceedings of the 51st International Conference on Parallel Processing10.1145/3547276.3548522(1-10)Online publication date: 29-Aug-2022
https://dl.acm.org/doi/10.1145/3547276.3548522
Holmen JSahasrabudhe DBerzins MRobinson T(2022)Porting uintah to heterogeneous systemsProceedings of the Platform for Advanced Scientific Computing Conference10.1145/3539781.3539794(1-10)Online publication date: 27-Jun-2022
https://dl.acm.org/doi/10.1145/3539781.3539794
Yadav RAiken AKjolstad FJhala RDillig I(2022)DISTAL: the distributed tensor algebra compilerProceedings of the 43rd ACM SIGPLAN International Conference on Programming Language Design and Implementation10.1145/3519939.3523437(286-300)Online publication date: 9-Jun-2022
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Awar NJain KRossbach CGligoric M(2021)Programming and execution models for parallel bounded exhaustive testingProceedings of the ACM on Programming Languages10.1145/34855435:OOPSLA(1-28)Online publication date: 15-Oct-2021
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Cartier HDinan JLarkins D(2021)Optimizing Work Stealing Communication with Structured Atomic OperationsProceedings of the 50th International Conference on Parallel Processing10.1145/3472456.3472522(1-10)Online publication date: 9-Aug-2021
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