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Documents authored by Rinetzky, Noam

Document
DOI: 10.4230/LIPIcs.DISC.2018.23
Order out of Chaos: Proving Linearizability Using Local Views

Authors: Yotam M. Y. Feldman, Constantin Enea, Adam Morrison, Noam Rinetzky, and Sharon Shoham

Published in: LIPIcs, Volume 121, 32nd International Symposium on Distributed Computing (DISC 2018)

Abstract
Proving the linearizability of highly concurrent data structures, such as those using optimistic concurrency control, is a challenging task. The main difficulty is in reasoning about the view of the memory obtained by the threads, because as they execute, threads observe different fragments of memory from different points in time. Until today, every linearizability proof has tackled this challenge from scratch. We present a unifying proof argument for the correctness of unsynchronized traversals, and apply it to prove the linearizability of several highly concurrent search data structures, including an optimistic self-balancing binary search tree, the Lazy List and a lock-free skip list. Our framework harnesses sequential reasoning about the view of a thread, considering the thread as if it traverses the data structure without interference from other operations. Our key contribution is showing that properties of reachability along search paths can be deduced for concurrent traversals from such interference-free traversals, when certain intuitive conditions are met. Basing the correctness of traversals on such local view arguments greatly simplifies linearizability proofs. At the heart of our result lies a notion of order on the memory, corresponding to the order in which locations in memory are read by the threads, which guarantees a certain notion of consistency between the view of the thread and the actual memory. To apply our framework, the user proves that the data structure satisfies two conditions: (1) acyclicity of the order on memory, even when it is considered across intermediate memory states, and (2) preservation of search paths to locations modified by interfering writes. Establishing the conditions, as well as the full linearizability proof utilizing our proof argument, reduces to simple concurrent reasoning. The result is a clear and comprehensible correctness proof, and elucidates common patterns underlying several existing data structures.
Cite as

Yotam M. Y. Feldman, Constantin Enea, Adam Morrison, Noam Rinetzky, and Sharon Shoham. Order out of Chaos: Proving Linearizability Using Local Views. In 32nd International Symposium on Distributed Computing (DISC 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 121, pp. 23:1-23:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{feldman_et_al:LIPIcs.DISC.2018.23,
  author =	{Feldman, Yotam M. Y. and Enea, Constantin and Morrison, Adam and Rinetzky, Noam and Shoham, Sharon},
  title =	{{Order out of Chaos: Proving Linearizability Using Local Views}},
  booktitle =	{32nd International Symposium on Distributed Computing (DISC 2018)},
  pages =	{23:1--23:21},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-092-7},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{121},
  editor =	{Schmid, Ulrich and Widder, Josef},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.DISC.2018.23},
  URN =		{urn:nbn:de:0030-drops-98124},
  doi =		{10.4230/LIPIcs.DISC.2018.23},
  annote =	{Keywords: concurrency and synchronization, concurrent data structures, lineariazability, optimistic concurrency control, verification and formal methods}
}
Document
DOI: 10.4230/LIPIcs.ICDT.2017.16
On the Automated Verification of Web Applications with Embedded SQL

Authors: Shachar Itzhaky, Tomer Kotek, Noam Rinetzky, Mooly Sagiv, Orr Tamir, Helmut Veith, and Florian Zuleger

Published in: LIPIcs, Volume 68, 20th International Conference on Database Theory (ICDT 2017)

Abstract
A large number of web applications is based on a relational database together with a program, typically a script, that enables the user to interact with the database through embedded SQL queries and commands. In this paper, we introduce a method for formal automated verification of such systems which connects database theory to mainstream program analysis. We identify a fragment of SQL which captures the behavior of the queries in our case studies, is algorithmically decidable, and facilitates the construction of weakest preconditions. Thus, we can integrate the analysis of SQL queries into a program analysis tool chain. To this end, we implement a new decision procedure for the SQL fragment that we introduce. We demonstrate practical applicability of our results with three case studies, a web administrator, a simple firewall, and a conference management system.
Cite as

Shachar Itzhaky, Tomer Kotek, Noam Rinetzky, Mooly Sagiv, Orr Tamir, Helmut Veith, and Florian Zuleger. On the Automated Verification of Web Applications with Embedded SQL. In 20th International Conference on Database Theory (ICDT 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 68, pp. 16:1-16:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{itzhaky_et_al:LIPIcs.ICDT.2017.16,
  author =	{Itzhaky, Shachar and Kotek, Tomer and Rinetzky, Noam and Sagiv, Mooly and Tamir, Orr and Veith, Helmut and Zuleger, Florian},
  title =	{{On the Automated Verification of Web Applications with Embedded SQL}},
  booktitle =	{20th International Conference on Database Theory (ICDT 2017)},
  pages =	{16:1--16:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-024-8},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{68},
  editor =	{Benedikt, Michael and Orsi, Giorgio},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICDT.2017.16},
  URN =		{urn:nbn:de:0030-drops-70509},
  doi =		{10.4230/LIPIcs.ICDT.2017.16},
  annote =	{Keywords: SQL; scripting language; web services; program verification; two-variable fragment of first order logic; decidability; reasoning}
}
Document
DOI: 10.4230/LIPIcs.OPODIS.2015.15
A Heap-Based Concurrent Priority Queue with Mutable Priorities for Faster Parallel Algorithms

Authors: Orr Tamir, Adam Morrison, and Noam Rinetzky

Published in: LIPIcs, Volume 46, 19th International Conference on Principles of Distributed Systems (OPODIS 2015)

Abstract
Existing concurrent priority queues do not allow to update the priority of an element after its insertion. As a result, algorithms that need this functionality, such as Dijkstra's single source shortest path algorithm, resort to cumbersome and inefficient workarounds. We report on a heap-based concurrent priority queue which allows to change the priority of an element after its insertion. We show that the enriched interface allows to express Dijkstra's algorithm in a more natural way, and that its implementation, using our concurrent priority queue, outperform existing algorithms.
Cite as

Orr Tamir, Adam Morrison, and Noam Rinetzky. A Heap-Based Concurrent Priority Queue with Mutable Priorities for Faster Parallel Algorithms. In 19th International Conference on Principles of Distributed Systems (OPODIS 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 46, pp. 15:1-15:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{tamir_et_al:LIPIcs.OPODIS.2015.15,
  author =	{Tamir, Orr and Morrison, Adam and Rinetzky, Noam},
  title =	{{A Heap-Based Concurrent Priority Queue with Mutable Priorities for Faster Parallel Algorithms}},
  booktitle =	{19th International Conference on Principles of Distributed Systems (OPODIS 2015)},
  pages =	{15:1--15:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-98-9},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{46},
  editor =	{Anceaume, Emmanuelle and Cachin, Christian and Potop-Butucaru, Maria},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2015.15},
  URN =		{urn:nbn:de:0030-drops-66068},
  doi =		{10.4230/LIPIcs.OPODIS.2015.15},
  annote =	{Keywords: priority queues, concurrent data structures, Dijkstra's single-source shortest path algorithm}
}
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