July 13th-16th, 2010
Ottawa Westin
Ottawa, Canada

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Prediction of Optimal Readahead Parameter in Linux by Using Monitoring Tool

Frequently, application developers face to the hidden performance problems that are caused by operating system internal behavior. For overriding such problems, Linux operation system has a lot of parameters that can be tuned by user-defined values for accelerating the system performance. However, in common case evaluating of the best system parameters requires a very time consuming investigation in Linux operating system area that usually is impossible because of strong time limitations for development process.

This paper describes a method that provides the prediction of optimal "maximal read-ahead window size" parameter by using the monitoring tool for Linux kernel. An optimal parameter value can be obtained by any developer for a single application run without additional technical knowledge in Linux kernel. Experiments for Linux kernel 2.6 show that suggested method detects an optimal "maximal read-ahead window size" for various real embedded applications with adequate accuracy and optimization effect can be about a few and even a few dozen percents in comparison to default case.

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