Schloss Dagstuhl - Leibniz-Zentrum für Informatik GmbH Schloss Dagstuhl - Leibniz-Zentrum für Informatik GmbH scholarly article en Arteca, Ellen; Tip, Frank; Schäfer, Max https://www.dagstuhl.de/lipics License: Creative Commons Attribution 4.0 license (CC BY 4.0)
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URN: urn:nbn:de:0030-drops-140501
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Enabling Additional Parallelism in Asynchronous JavaScript Applications

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Abstract

JavaScript is a single-threaded programming language, so asynchronous programming is practiced out of necessity to ensure that applications remain responsive in the presence of user input or interactions with file systems and networks. However, many JavaScript applications execute in environments that do exhibit concurrency by, e.g., interacting with multiple or concurrent servers, or by using file systems managed by operating systems that support concurrent I/O. In this paper, we demonstrate that JavaScript programmers often schedule asynchronous I/O operations suboptimally, and that reordering such operations may yield significant performance benefits. Concretely, we define a static side-effect analysis that can be used to determine how asynchronous I/O operations can be refactored so that asynchronous I/O-related requests are made as early as possible, and so that the results of these requests are awaited as late as possible. While our static analysis is potentially unsound, we have not encountered any situations where it suggested reorderings that change program behavior. We evaluate the refactoring on 20 applications that perform file- or network-related I/O. For these applications, we observe average speedups ranging between 0.99% and 53.6% for the tests that execute refactored code (8.1% on average).

BibTeX - Entry

@InProceedings{arteca_et_al:LIPIcs.ECOOP.2021.7,
  author =	{Arteca, Ellen and Tip, Frank and Sch\"{a}fer, Max},
  title =	{{Enabling Additional Parallelism in Asynchronous JavaScript Applications}},
  booktitle =	{35th European Conference on Object-Oriented Programming (ECOOP 2021)},
  pages =	{7:1--7:28},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-190-0},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{194},
  editor =	{M{\o}ller, Anders and Sridharan, Manu},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/opus/volltexte/2021/14050},
  URN =		{urn:nbn:de:0030-drops-140501},
  doi =		{10.4230/LIPIcs.ECOOP.2021.7},
  annote =	{Keywords: asynchronous programming, refactoring, side-effect analysis, performance optimization, static analysis, JavaScript}
}

Keywords: asynchronous programming, refactoring, side-effect analysis, performance optimization, static analysis, JavaScript
Seminar: 35th European Conference on Object-Oriented Programming (ECOOP 2021)
Issue date: 2021
Date of publication: 06.07.2021
Supplementary Material: Software (ECOOP 2021 Artifact Evaluation approved artifact): https://doi.org/10.4230/DARTS.7.2.5


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