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DOI: 10.4230/LIPIcs.CSL.2021.34

Typable Fragments of Polynomial Automatic Amortized Resource Analysis

Authors: Long Pham and Jan Hoffmann

Published in: LIPIcs, Volume 183, 29th EACSL Annual Conference on Computer Science Logic (CSL 2021)

Abstract

Being a fully automated technique for resource analysis, automatic amortized resource analysis (AARA) can fail in returning worst-case cost bounds of programs, fundamentally due to the undecidability of resource analysis. For programmers who are unfamiliar with the technical details of AARA, it is difficult to predict whether a program can be successfully analyzed in AARA. Motivated by this problem, this article identifies classes of programs that can be analyzed in type-based polynomial AARA. Firstly, it is shown that the set of functions that are typable in univariate polynomial AARA coincides with the complexity class PTime. Secondly, the article presents a sufficient condition for typability that axiomatically requires every sub-expression of a given program to be polynomial-time. It is proved that this condition implies typability in multivariate polynomial AARA under some syntactic restrictions.

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Long Pham and Jan Hoffmann. Typable Fragments of Polynomial Automatic Amortized Resource Analysis. In 29th EACSL Annual Conference on Computer Science Logic (CSL 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 183, pp. 34:1-34:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{pham_et_al:LIPIcs.CSL.2021.34,
  author =	{Pham, Long and Hoffmann, Jan},
  title =	{{Typable Fragments of Polynomial Automatic Amortized Resource Analysis}},
  booktitle =	{29th EACSL Annual Conference on Computer Science Logic (CSL 2021)},
  pages =	{34:1--34:19},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-175-7},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{183},
  editor =	{Baier, Christel and Goubault-Larrecq, Jean},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2021.34},
  URN =		{urn:nbn:de:0030-drops-134681},
  doi =		{10.4230/LIPIcs.CSL.2021.34},
  annote =	{Keywords: Resource consumption, Quantitative analysis, Amortized analysis, Typability}
}

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DOI: 10.4230/LIPIcs.FSCD.2017.26

Arrays and References in Resource Aware ML

Authors: Benjamin Lichtman and Jan Hoffmann

Published in: LIPIcs, Volume 84, 2nd International Conference on Formal Structures for Computation and Deduction (FSCD 2017)

Abstract

This article introduces a technique to accurately perform static prediction of resource usage for ML-like functional programs with references and arrays. Previous research successfully integrated the potential method of amortized analysis with a standard type system to automatically derive parametric resource bounds. The analysis is naturally compositional and the resource consumption of functions can be abstracted using potential-annotated types. The soundness theorem of the analysis guarantees that the derived bounds are correct with respect to the resource usage defined by a cost semantics. Type inference can be efficiently automated using off-the-shelf LP solvers, even if the derived bounds are polynomials. However, side effects and aliasing of heap references make it notoriously difficult to derive bounds that depend on mutable structures, such as arrays and references. As a result, existing automatic amortized analysis systems for ML-like programs cannot derive bounds for programs whose resource consumption depends on data in such structures. This article extends the potential method to handle mutable structures with minimal changes to the type rules while preserving the stated advantages of amortized analysis. To do so, we introduce a swap operation for references and arrays that users can use to make programs suitable for automatic analysis. We prove the soundness of the analysis introducing a potential-annotated memory typing, which gathers all unique locations reachable from a reference. Apart from the design of the system, the main contribution is the proof of soundness for the extended analysis system.

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Benjamin Lichtman and Jan Hoffmann. Arrays and References in Resource Aware ML. In 2nd International Conference on Formal Structures for Computation and Deduction (FSCD 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 84, pp. 26:1-26:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{lichtman_et_al:LIPIcs.FSCD.2017.26,
  author =	{Lichtman, Benjamin and Hoffmann, Jan},
  title =	{{Arrays and References in Resource Aware ML}},
  booktitle =	{2nd International Conference on Formal Structures for Computation and Deduction (FSCD 2017)},
  pages =	{26:1--26:20},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-047-7},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{84},
  editor =	{Miller, Dale},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.FSCD.2017.26},
  URN =		{urn:nbn:de:0030-drops-77282},
  doi =		{10.4230/LIPIcs.FSCD.2017.26},
  annote =	{Keywords: Resource Analysis, Functional Programming, Static Analysis, OCaml, Amortized Analysis}
}

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Typable Fragments of Polynomial Automatic Amortized Resource Analysis

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Arrays and References in Resource Aware ML

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