Investigação e desenvolvimento de um framework para testes de estratégias de controle automático visando melhoria de desempenho em servidores web apache

Abstract

In this work, a study is carried out for the computational development of automatic control tests in computer response systems to “HTTP” “Apache” request. In particular, the implementation details and results in an environment for digital performance control of the HTTP response system are discussed. Thus, it was necessary to design and develop an environment for performing data collection in the computational system that provides the response service to “HTTP” requests and makes interventions in the values of the available parameters in order to control the system automatically in closed loop. The parameter to be obtained as endogenous variable of the computational system is MaxRequestWorks, and the exogenous one will be the amount of memory consumed. The tool developed modifies neither the source code of the response software to the clients’ “HTTP” requests nor the operating system code of the host computer, being non-intrusive regarding original system configuration. A proportional-integral (PI) controller was designed in order to keep the average perceived time response of “HTTP” messages regulated. Experimental tests carried out on an Apache server show the improvement obtained on the system's time response.