Parallel backtracking with answer memoing for independent and-parallelism

Chico de Guzmán, Pablo and Casas, Amadeo and Carro Liñares, Manuel and Hermenegildo, Manuel V. (2011). Parallel backtracking with answer memoing for independent and-parallelism. "Theory and practice of logic programming", v. 11 (n. 4-5); pp. 555-574. ISSN 1475-3081. https://doi.org/10.1017/S1471068411000172.

Description

Title: Parallel backtracking with answer memoing for independent and-parallelism
Author/s:
  • Chico de Guzmán, Pablo
  • Casas, Amadeo
  • Carro Liñares, Manuel
  • Hermenegildo, Manuel V.
Item Type: Article
Título de Revista/Publicación: Theory and practice of logic programming
Date: July 2011
Volume: 11
Subjects:
Freetext Keywords: Parallelism, Logic programming, Memoization, Backtracking, Performance, Programación lógica,Algoritmos, rendimiento
Faculty: Facultad de Informática (UPM)
Department: Inteligencia Artificial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Goal-level Independent and-parallelism (IAP) is exploited by scheduling for simultaneous execution two or more goals which will not interfere with each other at run time. This can be done safely even if such goals can produce múltiple answers. The most successful IAP implementations to date have used recomputation of answers and sequentially ordered backtracking. While in principie simplifying the implementation, recomputation can be very inefficient if the granularity of the parallel goals is large enough and they produce several answers, while sequentially ordered backtracking limits parallelism. And, despite the expected simplification, the implementation of the classic schemes has proved to involve complex engineering, with the consequent difficulty for system maintenance and extensión, while still frequently running into the well-known trapped goal and garbage slot problems. This work presents an alternative parallel backtracking model for IAP and its implementation. The model features parallel out-of-order (i.e., non-chronological) backtracking and relies on answer memoization to reuse and combine answers. We show that this approach can bring significant performance advantages. Also, it can bring some simplification to the important engineering task involved in implementing the backtracking mechanism of previous approaches.

More information

Item ID: 4737
DC Identifier: http://oa.upm.es/4737/
OAI Identifier: oai:oa.upm.es:4737
DOI: 10.1017/S1471068411000172
Official URL: http://arxiv.org/pdf/1107.4724.pdf
Deposited by: Biblioteca Facultad de Informatica
Deposited on: 17 Nov 2012 07:50
Last Modified: 20 Apr 2016 13:50
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