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Analyzing Root Causes of Latency Distributions.: (English)

Analyzing Root Causes of Latency Distributions.: (English)

          
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About the Book

OSprof is a versatile, portable, and efficient profiling methodology based on the analysis of latency distributions. Although OSprof offers several unique benefits and has been used to uncover several interesting performance problems, the latency distributions that it provides must be analyzed manually. These latency distributions are presented as histograms and contain distinct groups of data, called peaks, that characterize the overall behavior of the running code. Our thesis is that by automating the analysis process, we make it easier to take advantage of OSprof's unique features. We have developed the Dynamic Analysis of Root Causes system (DARC), which finds root cause paths in a running program's call-graph using runtime latency analysis. A root cause path is a call-path that starts at a given function and includes the largest latency contributors to a given peak. These paths are the main causes for the high-level behavior that is represented as a peak in an OSprof histogram. DARC uses dynamic binary instrumentation to analyze running code. DARC performs PID and call-path filtering to reduce overheads and perturbations, and can handle recursive and indirect calls. DARC can analyze preemptive behavior and asynchronous call-paths, and can also resume its analysis from a previous state, which is useful when analyzing short-running programs or specific phases of a program's execution. In this dissertation we present the design and implementation of DARC. Our implementation is able to find user-space and kernel-space root cause paths, as well as paths that originate in user-space and terminate in kernel-space. We also investigate the possibility of using OSprof and DARC in virtual machine environments. We show DARC's usefulness by analyzing behaviors that were observed in several interesting scenarios. We compared the analysis of these behaviors when using DARC to the manual analysis required by the original OSprof methodology, and found that DARC provides more concrete evidence about root causes while requiring less time, expertise, and intuition. In our performance evaluation, we show that DARC has negligible elapsed time overheads for normal use cases.


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Product Details
  • ISBN-13: 9781243752000
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • No of Pages: 88
  • Series Title: English
  • Weight: 191 gr
  • ISBN-10: 1243752009
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 6 mm
  • Width: 203 mm


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Analyzing Root Causes of Latency Distributions.: (English)
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