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Parallelization of Dynamic Languages: Synchronizing Built-in Collections

Daloze, Benoit, Tal, Arie, Marr, Stefan, Mössenböck, Hanspeter, Petrank, Erez (2018) Parallelization of Dynamic Languages: Synchronizing Built-in Collections. Proceedings of the ACM on Programming Languages, 2 (OOPSLA). Article Number 108. ISSN 2475-1421. E-ISSN 2475-1421. (doi:10.1145/3276478) (KAR id:69156)


Dynamic programming languages such as Python and Ruby are widely used, and much effort is spent on making them efficient. One substantial research effort in this direction is the enabling of parallel code execution. While there has been significant progress, making dynamic collections efficient, scalable, and thread-safe is an open issue. Typical programs in dynamic languages use few but versatile collection types. Such collections are an important ingredient of dynamic environments, but are difficult to make safe, efficient, and scalable. In this paper, we propose an approach for efficient and concurrent collections by gradually increasing synchronization levels according to the dynamic needs of each collection instance. Collections reachable only by a single thread have no synchronization, arrays accessed in bounds have minimal synchronization, and for the general case, we adopt the Layout Lock paradigm and extend its design with a lightweight version that fits the setting of dynamic languages. We apply our approach to Ruby’s Array and Hash collections. Our experiments show that our approach has no overhead on single-threaded benchmarks, scales linearly for Array and Hash accesses, achieves the same scalability as Fortran and Java for classic parallel algorithms, and scales better than other Ruby implementations on Ruby workloads.

Item Type: Article
DOI/Identification number: 10.1145/3276478
Uncontrolled keywords: Dynamically-typed languages, Collections, Concurrency, Ruby, Trule, Graal, Thread Safety
Subjects: Q Science > QA Mathematics (inc Computing science) > QA 76 Software, computer programming,
Divisions: Faculties > Sciences > School of Computing
Depositing User: Stefan Marr
Date Deposited: 20 Sep 2018 08:44 UTC
Last Modified: 04 Nov 2020 11:00 UTC
Resource URI: (The current URI for this page, for reference purposes)
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