Performance modeling of systems using fair share scheduling with Layered Queueing Networks

Lianhua Li, G. Franks
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引用次数: 9

Abstract

Fair-share scheduling attempts to grant access to a resource based on the amount of ¿share¿ that a task possesses. It is widely used in places such as Internet routing, and recently, in the Linux kernel. Software performance engineering is concerned with creating responsive applications and often uses modeling to predict the behaviour of a system before the system is built. This work extends the Layered Queueing Network (LQN) performance model used to model distributed software systems by including hierarchical fair-share scheduling with both guarantees and caps. To exercise the model, the Completely Fair Scheduler, found in recent Linux kernels, is incorporated into PARASOL, the underlying simulation engine of the LQN simulator, lqsim. This simulator is then used to study the effects of fair-share scheduling on a multi-tier implementation of a building security system. The results here show that fair-share scheduling with guarantees is not sufficient when an application is layered into multiple tiers because of contention at lower layers in the system. Fair-share scheduling with caps must be used instead.
分层排队网络中公平共享调度系统的性能建模
公平共享调度尝试根据任务拥有的共享量授予对资源的访问权限。它广泛应用于Internet路由等领域,最近还应用于Linux内核。软件性能工程关注于创建响应性应用程序,并且经常在系统构建之前使用建模来预测系统的行为。这项工作扩展了分层排队网络(LQN)性能模型,该模型用于对分布式软件系统进行建模,包括具有保证和上限的分层公平共享调度。为了执行该模型,在最近的Linux内核中发现的完全公平调度程序被合并到PARASOL中,它是LQN模拟器lqsim的底层仿真引擎。然后利用该仿真器研究了公平分担调度对建筑安全系统多层实现的影响。本文的结果表明,当应用程序分层为多层时,由于系统中较低层的争用,具有保证的公平共享调度是不够的。必须使用带上限的公平共享调度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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