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Ensuring the Performance of Apache HTTP Server Affected by Aging

机译:确保受老化影响的Apache HTTP Server的性能

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Failures due to software aging are typically caused by resource exhaustion, which is often preceded by progressive software performance degradation. Response time as a customer-affecting metric can thus be used to detect the onset of software aging. In this paper, we propose the distribution-based rejuvenation algorithm (DBRA), which uses a validated $({rm M/E}_2/1/{rm K})$ queuing model of the Apache HTTP server to decide when to trigger rejuvenation. We compare the performance of the DBRA with the one of the static rejuvenation algorithm with averaging (SRAA) presented by Avritzer et al. Simulation results show the effectiveness of the DBRA and its advantages over the SRAA in reducing the average response time. However, the DBRA generally tends to trigger rejuvenation more frequently than the SRAA, which increases the request blocking probability.
机译:由于软件老化而导致的故障通常是由资源耗尽引起的,通常是在资源性能逐渐下降之前。因此,响应时间作为影响客户的指标,可以用来检测软件老化的开始。在本文中,我们提出了基于分布的复兴算法(DBRA),该算法使用经过验证的Apache HTTP服务器$({rm M / E} _2 / 1 / {rm K})$排队模型来决定何时触发复兴。我们将DBRA的性能与Avritzer等人提出的静态平均平均年轻化算法(SRAA)进行了比较。仿真结果显示了DBRA的有效性及其与SRAA相比在减少平均响应时间方面的优势。但是,与SRAA相比,DBRA通常倾向于更频繁地触发更新,这增加了请求阻止的可能性。

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