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Argobots: A Lightweight Low-Level Threading and Tasking Framework.

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Název:	Argobots: A Lightweight Low-Level Threading and Tasking Framework.
Autoři:	Seo, Sangmin¹, Amer, Abdelhalim¹, Balaji, Pavan¹, Bordage, Cyril², Bosilca, George³, Brooks, Alex⁴, Carns, Philip¹, Castello, Adrian⁵, Genet, Damien³, Herault, Thomas³, Iwasaki, Shintaro⁶, Jindal, Prateek⁴, Kale, Laxmikant V.⁴, Krishnamoorthy, Sriram⁷, Lifflander, Jonathan⁸, Lu, Huiwei⁹, Meneses, Esteban¹⁰, Snir, Marc⁴, Sun, Yanhua¹¹, Taura, Kenjiro⁶
Zdroj:	IEEE Transactions on Parallel & Distributed Systems. Mar2018, Vol. 29 Issue 3, p512-526. 15p.
Témata:	PORTABLE computers, COMPUTER programming, THREADS (Computer programs), SYNCHRONIZATION, INTERFERENCE (Telecommunication)
Abstrakt:	In the past few decades, a number of user-level threading and tasking models have been proposed in the literature to address the shortcomings of OS-level threads, primarily with respect to cost and flexibility. Current state-of-the-art user-level threading and tasking models, however, either are too specific to applications or architectures or are not as powerful or flexible. In this paper, we present Argobots, a lightweight, low-level threading and tasking framework that is designed as a portable and performant substrate for high-level programming models or runtime systems. Argobots offers a carefully designed execution model that balances generality of functionality with providing a rich set of controls to allow specialization by end users or high-level programming models. We describe the design, implementation, and performance characterization of Argobots and present integrations with three high-level models: OpenMP, MPI, and colocated I/O services. Evaluations show that (1) Argobots, while providing richer capabilities, is competitive with existing simpler generic threading runtimes; (2) our OpenMP runtime offers more efficient interoperability capabilities than production OpenMP runtimes do; (3) when MPI interoperates with Argobots instead of Pthreads, it enjoys reduced synchronization costs and better latency-hiding capabilities; and (4) I/O services with Argobots reduce interference with colocated applications while achieving performance competitive with that of a Pthreads approach. [ABSTRACT FROM AUTHOR]
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Abstrakt:	In the past few decades, a number of user-level threading and tasking models have been proposed in the literature to address the shortcomings of OS-level threads, primarily with respect to cost and flexibility. Current state-of-the-art user-level threading and tasking models, however, either are too specific to applications or architectures or are not as powerful or flexible. In this paper, we present Argobots, a lightweight, low-level threading and tasking framework that is designed as a portable and performant substrate for high-level programming models or runtime systems. Argobots offers a carefully designed execution model that balances generality of functionality with providing a rich set of controls to allow specialization by end users or high-level programming models. We describe the design, implementation, and performance characterization of Argobots and present integrations with three high-level models: OpenMP, MPI, and colocated I/O services. Evaluations show that (1) Argobots, while providing richer capabilities, is competitive with existing simpler generic threading runtimes; (2) our OpenMP runtime offers more efficient interoperability capabilities than production OpenMP runtimes do; (3) when MPI interoperates with Argobots instead of Pthreads, it enjoys reduced synchronization costs and better latency-hiding capabilities; and (4) I/O services with Argobots reduce interference with colocated applications while achieving performance competitive with that of a Pthreads approach. [ABSTRACT FROM AUTHOR]
ISSN:	10459219
DOI:	10.1109/TPDS.2017.2766062