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DOI: 10.4230/LIPIcs.OPODIS.2022.5

EEMARQ: Efficient Lock-Free Range Queries with Memory Reclamation

Authors: Gali Sheffi, Pedro Ramalhete, and Erez Petrank

Published in: LIPIcs, Volume 253, 26th International Conference on Principles of Distributed Systems (OPODIS 2022)

Abstract

Multi-Version Concurrency Control (MVCC) is a common mechanism for achieving linearizable range queries in database systems and concurrent data-structures. The core idea is to keep previous versions of nodes to serve range queries, while still providing atomic reads and updates. Existing concurrent data-structure implementations, that support linearizable range queries, are either slow, use locks, or rely on blocking reclamation schemes. We present EEMARQ, the first scheme that uses MVCC with lock-free memory reclamation to obtain a fully lock-free data-structure supporting linearizable inserts, deletes, contains, and range queries. Evaluation shows that EEMARQ outperforms existing solutions across most workloads, with lower space overhead and while providing full lock freedom.

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Gali Sheffi, Pedro Ramalhete, and Erez Petrank. EEMARQ: Efficient Lock-Free Range Queries with Memory Reclamation. In 26th International Conference on Principles of Distributed Systems (OPODIS 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 253, pp. 5:1-5:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{sheffi_et_al:LIPIcs.OPODIS.2022.5,
  author =	{Sheffi, Gali and Ramalhete, Pedro and Petrank, Erez},
  title =	{{EEMARQ: Efficient Lock-Free Range Queries with Memory Reclamation}},
  booktitle =	{26th International Conference on Principles of Distributed Systems (OPODIS 2022)},
  pages =	{5:1--5:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-265-5},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{253},
  editor =	{Hillel, Eshcar and Palmieri, Roberto and Rivi\`{e}re, Etienne},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2022.5},
  URN =		{urn:nbn:de:0030-drops-176253},
  doi =		{10.4230/LIPIcs.OPODIS.2022.5},
  annote =	{Keywords: safe memory reclamation, lock-freedom, snapshot, concurrency, range query}
}

Document

DOI: 10.4230/LIPIcs.DISC.2021.35

VBR: Version Based Reclamation

Authors: Gali Sheffi, Maurice Herlihy, and Erez Petrank

Published in: LIPIcs, Volume 209, 35th International Symposium on Distributed Computing (DISC 2021)

Abstract

Safe lock-free memory reclamation is a difficult problem. Existing solutions follow three basic methods (or their combinations): epoch based reclamation, hazard pointers, and optimistic reclamation. Epoch-based methods are fast, but do not guarantee lock-freedom. Hazard pointer solutions are lock-free but typically do not provide high performance. Optimistic methods are lock-free and fast, but previous optimistic methods did not go all the way. While reads were executed optimistically, writes were protected by hazard pointers. In this work we present a new reclamation scheme called version based reclamation (VBR), which provides a full optimistic solution to lock-free memory reclamation, obtaining lock-freedom and high efficiency. Speculative execution is known as a fundamental tool for improving performance in various areas of computer science, and indeed evaluation with a lock-free linked-list, hash-table and skip-list shows that VBR outperforms state-of-the-art existing solutions.

Cite as

Gali Sheffi, Maurice Herlihy, and Erez Petrank. VBR: Version Based Reclamation. In 35th International Symposium on Distributed Computing (DISC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 209, pp. 35:1-35:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{sheffi_et_al:LIPIcs.DISC.2021.35,
  author =	{Sheffi, Gali and Herlihy, Maurice and Petrank, Erez},
  title =	{{VBR: Version Based Reclamation}},
  booktitle =	{35th International Symposium on Distributed Computing (DISC 2021)},
  pages =	{35:1--35:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-210-5},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{209},
  editor =	{Gilbert, Seth},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2021.35},
  URN =		{urn:nbn:de:0030-drops-148374},
  doi =		{10.4230/LIPIcs.DISC.2021.35},
  annote =	{Keywords: Safe memory reclamation, concurrency, linearizability, lock-freedom}
}

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EEMARQ: Efficient Lock-Free Range Queries with Memory Reclamation

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VBR: Version Based Reclamation

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