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Efficient goal scheduling in a concurrent logic language using type-based dependency analysis

  • Kazuhiko Ohno
  • Masahiko Ikawa
  • Masahiro Goshimai
  • Shin-ichiro Mori
  • Hiroshi Nakashima
  • Shinji Tomita
Session 6
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1345)

Abstract

In the execution model of concurrent logic languages like KL1, each goal is regarded as a unit of concurrent execution. Although this fine-grained concurrency control enables flexible concurrent/parallel programming, its overhead also causes inefficiency in its implementation. We propose an efficient goal scheduling scheme using the result of static analysis. In this scheme, we obtain precise dependency relations among goals using type-based dependency analysis. Then each set of goals without concurrency is compiled into one thread, a sequence of statically ordered goals, to reduce the overhead of goal scheduling. Since stacks are used to hold goal environments for each thread, the number of garbage collection is also reduced. The result of preliminary evaluation shows our scheme considerably reduces goal scheduling overhead and thus it achieves 1.3–3 times speedup.

Keywords

Logic Program Garbage Collection Dynamic Schedule Apparent Dependency Guard Horn Clause 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    K. Ueda. Guarded horn clauses. In LNCS221 Logic Programming '85, pp. 168–179. Springer-Verlag, 1986.Google Scholar
  2. 2.
    K. Ueda and T. Chikayama. Design of the kernel language for the parallel inference machine. The Computer Journal, Vol. 33, No. 6, pp. 494–500, 1990.CrossRefMathSciNetGoogle Scholar
  3. 3.
    T. Chikayama, T. Fujise, and D. Sekita. A portable and efficient implementation of KL1. In Proc. 6th Intl. Symp. PLILP'94, pp. 25–39, 1994.Google Scholar
  4. 4.
    Takashi Chikayama. KLIC User's Manual. ICOT, March 1995.Google Scholar
  5. 5.
    K. Nakajima, Y. Inamura, N. Ichiyoshi, K. Rokusawa, and T. Chikayama. Distributed implementation of KL1 on the Multi-PSI/V2. In Proc. 6th Intl. Conf. and Symp. on Logic Programming, pp. 436–451, 1989.Google Scholar
  6. 6.
    T. Chikayama. Operating system PIMOS and kernel language KL1. In FGCS'92, pp. 73–88, 1992.Google Scholar
  7. 7.
    Klaus E. Schauser, David E. Culler, and Seth C. Goldstein. Separation constraint partitioning — a new algorithm for partitioning non-strict programs into sequential threads. In POPL'95, pp. 259–271, 1995.Google Scholar
  8. 8.
    K. Ueda and M. Morita. Moded Flat GHC and its message-oriented implementation technique. New Generation Computing, Vol. 13, No. 1, pp. 3–43, November 1994.Google Scholar
  9. 9.
    D. H. D. Warren. An abstract prolog instruction set. Technical Report 309, SRI International, 1983.Google Scholar
  10. 10.
    K. Marriott, M. Garcia de la Banda, and M. Hermenegildo. Analyzing logic programs with dynamic scheduling. In POPL'94, 1994.Google Scholar
  11. 11.
    G. Puebla and M. Hermenegildo. Automatic optimization of dynamic scheduling in logic programs. In LNCS1140 PLILP'96, pp. 475–476. Springer-Verlag, 1996.Google Scholar
  12. 12.
    A.King and P.Soper. Schedule analysis of concurrent logic programs. In Proc. of the Joint Intl. Conf. and Symp. on Logic Programming, pp. 478–492, 1994.Google Scholar
  13. 13.
    B. C. Massey and E. Tick. Sequentialization of parallel logic programs with mode analysis. In 4th International Conference on Logic Programming and Automated Reasoning, pp. 205–216, 1993.Google Scholar
  14. 14.
    T. Araki and H. Tanaka. A static granularity optimization method of a committed-choice language Fleng(In Japanese). In IPSJ 96-PRO-8, pp. 109–114, August 1996.Google Scholar
  15. 15.
    M. Nilsson and H. Tanaka. Fleng prolog-the language which turns supercomputers into prolog machines. In LNCS264. Springer-Verlag, 1989.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Kazuhiko Ohno
    • 1
  • Masahiko Ikawa
    • 2
  • Masahiro Goshimai
    • 1
  • Shin-ichiro Mori
    • 1
  • Hiroshi Nakashima
    • 3
  • Shinji Tomita
    • 1
  1. 1.Kyoto UniversityJapan
  2. 2.Mitsubishi Electric CorporationJapan
  3. 3.Toyohashi University of TechnologyJapan

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