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European Conference on Object-Oriented Programming

ECOOP 2004: ECOOP 2004 – Object-Oriented Programming pp 559–583Cite as

Lock Reservation for Java Reconsidered

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Part of the Lecture Notes in Computer Science book series (LNCS,volume 3086)

Abstract

Lock reservation, a powerful optimization for Java locks, is based on the observation that, in Java, each lock tends to be dominantly acquired and released by a specific thread. Reserving a lock for such a dominant thread allows the owner thread of the lock to acquire and release the lock without any atomic read-modify-write instructions.

A recently proposed algorithm has embodied this idea and significantly reduced the synchronization overhead on a reservation hit. However, on a reservation miss, the algorithm stops the owner thread in order to cancel the reservation, which incurs a significant performance penalty.

We propose a new algorithm for lock reservation for Java without such penalties. We derive the algorithm in two steps. First, we create a new, reservation-based algorithm for spin lock. Second, observing that the conventional spin lock is embedded in a widely-used Java lock, we attempt to replace it with our new spin lock.

We evaluated our algorithm in IBM’s production virtual machine and JIT compiler. The results show that our algorithm attained comparable speedups in the SPECjvm98 benchmarks, and that it even improved the performance of two scientific programs which the previous algorithm actually degraded.

Keywords

  • Virtual Machine
  • Synchronization Overhead
  • Program Order
  • Spin Lock
  • Lock State

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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  • DOI: 10.1007/978-3-540-24851-4_26
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Authors and Affiliations

  1. IBM Research, Tokyo Research Laboratory, 1623-14, Shimotsuruma, Yamato-shi, Kanagawa-ken, 242-8502, Japan

    Tamiya Onodera, Kikyokuni Kawachiya & Akira Koseki

Authors
  1. Tamiya Onodera
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  2. Kikyokuni Kawachiya
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  3. Akira Koseki
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Editor information

Editors and Affiliations

  1. EPFL, 1015, Lausanne, Switzerland

    Martin Odersky

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Onodera, T., Kawachiya, K., Koseki, A. (2004). Lock Reservation for Java Reconsidered. In: Odersky, M. (eds) ECOOP 2004 – Object-Oriented Programming. ECOOP 2004. Lecture Notes in Computer Science, vol 3086. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-24851-4_26

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  • DOI: https://doi.org/10.1007/978-3-540-24851-4_26

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