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File system trace replay methods through the lens of metrology

机译：通过计量学角度的文件系统跟踪重播方法

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摘要

There are various methods to evaluate the performance of file systems through the replay of file system traces. Despite this diversity, little attention was given on comparing the alternatives, thus bringing some skepticism about the results attained using these methods. In this paper, to fill this understanding gap, we analyze two popular trace replay methods through the lens of metrology. This case study indicates that the evaluated methods provide similar, good precision but are biased in some scenarios. Our results identified limitations in the implementation of the replay tool as well as flaws in the established practices to experiment with trace replayers as the root causes of the measurement bias. After improving the implementation of the trace replayer and discarding inappropriate experimental practices, we were able to reduce the bias, leading to lower measurement uncertainty. Finally, our case study also shows that, in some cases, collecting only the file system activity is not enough to accurately replay the traces; in these cases, collecting resource consumption information, such as the amount of allocated memory, can improve the quality of trace replay methods.
机译：有多种方法可以通过重播文件系统跟踪来评估文件系统的性能。尽管存在这种多样性，但在比较替代方案时却很少关注，因此对使用这些方法获得的结果持怀疑态度。在本文中，为了填补这一理解空白，我们通过计量学的角度分析了两种流行的轨迹重播方法。此案例研究表明，所评估的方法提供了相似的精度，但在某些情况下存在偏差。我们的结果确定了重播工具实施的局限性，以及在将跟踪重播器作为测量偏差的根本原因进行试验的既定实践中存在的缺陷。在改进了跟踪重播器的实现并丢弃了不适当的实验做法之后，我们能够减少偏差，从而降低了测量不确定度。最后，我们的案例研究还表明，在某些情况下，仅收集文件系统活动不足以准确重播跟踪。在这些情况下，收集资源消耗信息（例如分配的内存量）可以提高跟踪重播方法的质量。

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