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Performance Testing Tool for Web Applications
Wartiak, Rastislav ; Děcký, Martin (referee) ; Kalibera, Tomáš (advisor)
When developing web applications, meeting performance requirements is vital to customer acceptance of the applications. Therefore, performance testing is an important part of their development. This thesis focuses on the implementation of a performance testing tool that would cover the functionality needed to test web applications, would be comparable with commercially available tools, would have the ability to generate load defined by scripts, and would offer functionality that is not widely offered by such tools, such as automatic request headers generation or variable script branching. The desired functionality was derived from the analysis of selected web applications, and the implemented tool is capable of simulating users interacting with these applications. This was proved by the creation of series of tests on Slovak Cadastral Portal and RUBiS benchmark site, whose results are included in the thesis.
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Tuning Virtual Memory for Performance
Hocko, Michal ; Kalibera, Tomáš (advisor) ; Yaghob, Jakub (referee)
Most of the current operating systems implement virtual memory management and provide only a virtual layer for the user land. It is known that the performance of some applications (especially memory intensive) is influenced by the current use of physical addresses specified by virtual memory mapping performed by the operating system and is not fully deterministic. The problem results in both sub-optimal and non-deterministic performance. This thesis focuses on the user space approach to virtual memory tuning for an application with special requirements. The Linux kernel was modified to provide a simple interface for the user space, which enables a process specific physical memory layout manipulation on strategies implemented as kernel modules. We have implemented CPU cache sensitive strategies and shown that this can improve both the optimality and determinism of performance for some applications.
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Visualization of trajectories of cars estimated using mobile phones signal levels
Danihelka, Jiří ; Bureš, Tomáš (referee) ; Kalibera, Tomáš (advisor)
This thesis covers the issue of location and trajectory displaying of a car or another object which were determined only on the basis of cell phone signal levels. Localization algorithms, information about the transmitter's positions and a signal propagation model are used to determine the location. A part of the thesis is the Guesstor Client program that displays the results of localization algorithms in a well arranged graphic form, makes it possible to compare the accuracy of different localization methods and allows us to follow the trajectory of automobiles in real time. The Guesstor Client program connects via a remote method invocation protocol the program Guesstor Server which contains the location algorithms and manages the measurements database.
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Network Repository for Performance Evaluation Results
Ondroušek, Pavel ; Kalibera, Tomáš (referee) ; Tůma, Petr (advisor)
For performance evaluation of software systems, benchmarking is used. Benchmarking generates a large amount of output data, which is necessary to store, process and evaluate it. Network Repository serves as a repository of benchmark results. The goal of the master thesis is to design and implement the data storage with a support of various result types with the possibility of the format configuration. Stored results can be processed, evaluated, or used as a source for plotting. As part of the master thesis, the design and implementation of a general framework for benchmark storage and evaluation is developed and a sample configuration for the selected benchmark result data format is established.
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Chemical laboratory
Kreibichová, Lenka ; Kalibera, Tomáš (referee) ; Zavoral, Filip (advisor)
The subject of this work is to implement the simulation of chemistry laboratory. The result is speciffied for user, who would like to test, how it works in a chemistry laboratory without entering the real room. In the virtual laboratory you can use test tubes and řasks of various shape, insert chemical matters, warm and old them, mix the contents of the flasks and watch the reactions. The important merit is the ability to set the series of instructions, that interactive help user to go through the chemical experiment.
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Performance in Software Development Cycle: Regression Benchmarking
Kalibera, Tomáš ; Tůma, Petr (advisor) ; Hauswirth, Matthias (referee) ; Eeckhout, Lieven (referee)
The development cycle of large software is necessarily prone to introducing software errors that are hard to find and fix. Automated regular testing (regression testing) is a popular method used to reduce the cost of finding and fixing functionality errors, but it neglects software performance. The thesis focuses on performance errors, enabling automated detection of performance changes during software development (regression benchmarking). The key investigated problem is non-determinism in computer systems, which causes performance fluctuations. The problem is addressed by a novel benchmarking methodology based on statistical methods. The methodology is evaluated on a large open-source project Mono, detecting daily performance changes since August 2004, and on open-source CORBA implementations omniORB and TAO. The benchmark automation is a complex task in itself. As suggested by experience with compilation of weather forecast model Arpege/Aladin and implementation of component model SOFA, large systems place distinguishing demands on tasks such as automated compilation or execution. Complemented by experience from Mono benchmarking, the thesis proposes an architecture of a generic environment for automated regression benchmarking. The environment is being implemented by master students under supervision of...
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Simulation of network structures
Novák, Pavel ; Kalibera, Tomáš (referee) ; Peterka, Jiří (advisor)
The simulation of network structures can be an effective method for example in teaching, research, or testing the network software, in order to lower the cost of building the real network structure that would be otherwise needed. Moreover, the simulated network can provide some advantages, e.g. simplified control and monitoring, statistical data collecting or visualization of the network behavior. This work focuses on the usage for teaching and testing; illustrates that existing network simulators are not always suitable for this purpose, suggests the architecture and design of a new solution, and offers implementation of the proposed simulation tool.
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