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

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, are either too specific to applications or architectures or are not as powerful or flexible. In this article, 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 the user or high-level programming model. Here, we describe the design, implementation, and optimization of Argobots and present integrations with three example high-level models: OpenMP, MPI, and co-located I/O service. Evaluations show that (1) Argobots outperforms existing 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 service with Argobots reduces interference with co-located applications, achieving performance competitive with that of the Pthreadsmore » version.« less
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  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Inria, Bordeaux (France)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Illinois, Urbana-Champaign, IL (United States)
  5. Universitat Jaume I., Castello de la Plana (Spain)
  6. Univ. of Tokyo (Japan)
  7. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  8. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  9. Tencent, Shenzhen (China)
  10. Costa Rica Inst. of Technology, Cartago (Costa Rica). Costa Rica National High Technology Center
  11. Google, Mountain View, CA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1045-9219; TRN: US1800430
Grant/Contract Number:
AC02-06CH11357; AC05-76RL01830
Accepted Manuscript
Journal Name:
IEEE Transactions on Parallel and Distributed Systems
Additional Journal Information:
Journal Name: IEEE Transactions on Parallel and Distributed Systems; Journal ID: ISSN 1045-9219
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
Country of Publication:
United States
42 ENGINEERING; Argobots; user-level thread; tasklet; OpenMP; MPI; I/O; interoperability; lightweight; context switch; stackable scheduler
OSTI Identifier: