SYSTEM REACTION TIME DURING INQUIRY PROCESSING
Abstract
The authors have studied features of network analytic database of automatic control system Express-3 that ensures collection, treating, storage, analysis of information on passenger traffic and baggage within the framework of relevant activities of JSC Russian Railways. Actually one can witness significant growth in number of control tasks and of users of Express-3 system, which causes high loading of system servers. In order to analyze the situation the authors studied features of automatic workstation «Monitoring of webapplications». The article describes the diagram of dependencies between system reaction time to users’ queries and parallelism index, relevant statistic series. The study revealed that dependency on complexity of queries is higher than dependency on users’ number. The authors use histogram of the density of distribution, and empiric function of distribution of studied value, as well as Pearson criterion to verify conformity of empiric law of distribution of system query reaction time to exponential and logarithmically normal laws. Using the statistic data, collected during the study, the authors made conclusion that those laws don’t conform to fitting criterion χ2. That’s why the article suggests that further simulation of existing process of simultaneous treating of users’ queries in Express-3 system environment should be based on relevant empiric functions of distribution which would serve as laws of time distribution of system reaction to users’ queries for the analysis of WEB-resources like PZDFINN, NEWSPN, RMEST.
About the Authors
M. P. Berezka
Moscow State University of Railway Engineering (MIIT), Moscow
Russian Federation
Ph.D. (Tech), associate professor at the department of automatic control systems
Russian Federation
Ph.D. (Tech), associate professor at the department of automatic control systems
A. T. Sugnatullina
Moscow State University of Railway Engineering (MIIT); JSC Russian Railways at Research Institute (VNIIZHT), Moscow
Russian Federation
Russian Federation
Ph.D. student
programmer engineer of the department of passenger traffic and automatic control system Express
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Review
For citations:
Berezka M.P., Sugnatullina A.T. SYSTEM REACTION TIME DURING INQUIRY PROCESSING. World of Transport and Transportation. 2013;(5):102-107. (In Russ.)
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