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Prediction of Optimal Readahead Parameter in Linux by Using Monitoring Tool

Sergey Grekhov (grekhov.s@samsung.com)

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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