Efficient Workstealing for Multicore Event-Driven SystemsReport as inadecuate




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* Corresponding author 1 SARDES - System architecture for reflective distributed computing environments Inria Grenoble - Rhône-Alpes, LIG - Laboratoire d-Informatique de Grenoble 2 LIP6 - Laboratoire d-Informatique de Paris 6 3 Regal - Large-Scale Distributed Systems and Applications LIP6 - Laboratoire d-Informatique de Paris 6, Inria Paris-Rocquencourt

Abstract : Many high-performance communicating systems are designed using the event-driven paradigm. As multicore platforms are now pervasive, it becomes crucial for such systems to take advantage of the available hardware parallelism. Event-coloring is a promising approach in this regard. First, it allows programmers to simply and progressively inject support for the safe, parallel execution of multiple event handlers through the use of annotations. Second, it relies on a workstealing algorithm to dynamically balance the execution of event handlers on the available cores. This paper studies the impact of the workstealing algorithm on the overall system performance. We first show that the only existing workstealing algorithm designed for event-coloring runtimes is not always efficient: for instance, it causes a 33% performance degradation on a Web server. We then introduce several enhancements to improve the workstealing behavior. An evaluation using both microbenchmarks and real applications, a Web server and the Secure File Server SFS, shows that our system consistently outperforms a state-of-the-art runtime Libasync-smp, with or without workstealing. In particular, our new workstealing improves performance by up to +25% compared to Libasync-smp without workstealing and by up to +73% compared to the Libasync-smp workstealing algorithm, in the Web server case

Résumé : Cet article présente un algorithme de vol de tâche pour les systèmes événementiels multi-coeurs.

Keywords : event-driven workstealing multicore system services performance





Author: Fabien Gaud - Sylvain Genevès - Renaud Lachaize - Baptiste Lepers - Fabien Mottet - Gilles Muller - Vivien Quema -

Source: https://hal.archives-ouvertes.fr/



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