Em obras de fundações por estacas cravadas, os diferentes comprimentos finais das estacas refletem a variabilidade natural do terreno, e variam de acordo com o critério de paralização da cravação, normalmente baseado em medidas de nega e repique elástico. Pouco se tem aproveitado desses registros para o controle da resistência mobilizada na fundação ao final da cravação, devido à limitação da aplicação das fórmulas dinâmicas e ao desconhecimento de alguns parâmetros. Em muitos casos de controle de capacidade de carga, apenas é realizada a aferição de um fator de segurança pontual, obtido via prova de carga. Neste trabalho, é apresentado um procedimento de controle de capacidade de carga de fundações por estacas cravadas, baseado em registros de nega e repique elástico, a partir de fórmulas dinâmicas, que possibilitam a estimativa da resistência mobilizada ao final da cravação em todo o universo de estacas de uma obra. Este procedimento proposto foi aplicado em um estudo de caso de uma obra em um porto em Santa Catarina. Nesta obra foram cravadas 2506 estacas pré-moldadas de concreto, controladas por nega e repique elástico, registrados em todas as estacas no final da cravação. Neste conjunto de estacas foram executadas 74 provas de carga dinâmica, com energia crescente, e quatro provas de carga estática. Neste caso de obra controlada, os resultados mostraram que o procedimento adotado, baseado na utilização de fórmulas dinâmicas, com parâmetros calibrados a partir dos resultados das provas de carga dinâmica, permitiu estimar valores de resistência mobilizada ao final da cravação das 2506 estacas da obra, que apresentaram um valor médio próximo ao valor médio encontrado nas 74 estacas ensaiadas. Além disso, o coeficiente de variação dos valores de resistência mobilizada de todas as estacas da obra foi da ordem de 16,0%, similar ao coeficiente de variação de 14,7%, obtido nos resultados das provas de carga dinâmica. / The different final lengths of driven piles reflect the natural variability of the soil, and are dependent of the driving controls based in the measurements of the final set and elastic rebound. Normally these measurements are not used to predict the ultimate capacity of pile foundations, at the end of driving, due to the limitation of the dynamic formulas and the lack of some parameters. In many cases, the pile capacity control is based on a determination of a single safety factor, obtained from pile load tests. In this work, it is proposed a procedure to control the ultimate capacity of driven piles, based on the results of the final set and the elastic rebound, and dynamic formulas, which allow the estimation of the mobilized resistance at the end of driving of all piles driven in a particular project. This procedure was applied in a case study of a port in Santa Catarina. In this case, 2506 precast concrete piles were driven, and controlled by the elastic rebound, recorded at the end of driving. Also, dynamic load tests, with increasing energy, were performed on 74 piles, and static load tests were carried out on four piles. The results showed that this procedure adopted, based on the use of dynamic formulas calibrated using the results of dynamic load tests, is capable to estimate the values of mobilized resistance along all piles at the end of driving. The average result of the mobilized resistance of the 2506 piles was close to the average value found by the results of the 74 pile dynamic load tests. Also, the coefficient of variation of the mobilized resistance of all piles was around 16.0%, similar to the coefficient of variation of 14.7%, obtained by the dynamic load tests.

Nowadays, non-functional testing has a great impact on the real-time environment. Non-functional testing helps to analyze the performance of the application on both server and client. Load testing attempts to cause the system under test to respond incorrectly in a situation that differs from its normal operation, but rarely encountered in real world use. Examples include providing abnormal inputs to the software or placing real-time software under unexpectedly high loads. High loads are induced over the application to test the performance, but there is a possibility that particular pattern of the low load could also induce load on a real-time system. For example, repeatedly making a request to the system every 11 seconds might cause a fault if the system transitions to standby state after 10 seconds of inactivity. The primary aim of this study is to find out various low load input patterns affecting the software, rather than simply high load inputs. A quasi-experiment was chosen as a research method for this study. Performance testing was performed on the web application with the help of a tool called HP load runner. A comparison was made between low load and high load patterns to analyze the performance of the application and to identify bottlenecks under different load.

Em obras de fundações por estacas cravadas, os diferentes comprimentos finais das estacas refletem a variabilidade natural do terreno, e variam de acordo com o critério de paralização da cravação, normalmente baseado em medidas de nega e repique elástico. Pouco se tem aproveitado desses registros para o controle da resistência mobilizada na fundação ao final da cravação, devido à limitação da aplicação das fórmulas dinâmicas e ao desconhecimento de alguns parâmetros. Em muitos casos de controle de capacidade de carga, apenas é realizada a aferição de um fator de segurança pontual, obtido via prova de carga. Neste trabalho, é apresentado um procedimento de controle de capacidade de carga de fundações por estacas cravadas, baseado em registros de nega e repique elástico, a partir de fórmulas dinâmicas, que possibilitam a estimativa da resistência mobilizada ao final da cravação em todo o universo de estacas de uma obra. Este procedimento proposto foi aplicado em um estudo de caso de uma obra em um porto em Santa Catarina. Nesta obra foram cravadas 2506 estacas pré-moldadas de concreto, controladas por nega e repique elástico, registrados em todas as estacas no final da cravação. Neste conjunto de estacas foram executadas 74 provas de carga dinâmica, com energia crescente, e quatro provas de carga estática. Neste caso de obra controlada, os resultados mostraram que o procedimento adotado, baseado na utilização de fórmulas dinâmicas, com parâmetros calibrados a partir dos resultados das provas de carga dinâmica, permitiu estimar valores de resistência mobilizada ao final da cravação das 2506 estacas da obra, que apresentaram um valor médio próximo ao valor médio encontrado nas 74 estacas ensaiadas. Além disso, o coeficiente de variação dos valores de resistência mobilizada de todas as estacas da obra foi da ordem de 16,0%, similar ao coeficiente de variação de 14,7%, obtido nos resultados das provas de carga dinâmica. / The different final lengths of driven piles reflect the natural variability of the soil, and are dependent of the driving controls based in the measurements of the final set and elastic rebound. Normally these measurements are not used to predict the ultimate capacity of pile foundations, at the end of driving, due to the limitation of the dynamic formulas and the lack of some parameters. In many cases, the pile capacity control is based on a determination of a single safety factor, obtained from pile load tests. In this work, it is proposed a procedure to control the ultimate capacity of driven piles, based on the results of the final set and the elastic rebound, and dynamic formulas, which allow the estimation of the mobilized resistance at the end of driving of all piles driven in a particular project. This procedure was applied in a case study of a port in Santa Catarina. In this case, 2506 precast concrete piles were driven, and controlled by the elastic rebound, recorded at the end of driving. Also, dynamic load tests, with increasing energy, were performed on 74 piles, and static load tests were carried out on four piles. The results showed that this procedure adopted, based on the use of dynamic formulas calibrated using the results of dynamic load tests, is capable to estimate the values of mobilized resistance along all piles at the end of driving. The average result of the mobilized resistance of the 2506 piles was close to the average value found by the results of the 74 pile dynamic load tests. Also, the coefficient of variation of the mobilized resistance of all piles was around 16.0%, similar to the coefficient of variation of 14.7%, obtained by the dynamic load tests.

This thesis if focused on performance, especially load testing of information systems. In the first part is defined software quality and reader is provided by fundamentals of software testing. Process of sofware testing is well described here. The rest of the paper is oriented on perfomance testing and it's processes and attributes. Specified are goals and principles of performance testing as well as types of performance tests and their purpose. Defined is load testing methodology including metrics for reliability and efficiency of information systems. Metrics are derived from well known international ISO standard 9126 - Software quality model. Methodology and metrics are validated during load test project on which author of this work participated. One chapter is also devoted to the tools used for load testing automatization. This paper is focused on the testing experts as well as on the other readers who want to acquire information on load testing, software efficiency or generally on testing of software quality.

The diploma thesis deals with the development of a tool for automated generation of load testing reports, which is implemented in the form of a plug-in into the load tester JMeter as one of its components. The theoretical part contains an analysis of load testing and DDoS parameters, which are the output of a web report. The thesis includes an analysis of available template processors. Based on the analysis of processor’s properties, the most appropriate one was chosen. This processor was then used in a tool that, using the web technologies, generates a report in a form of interactive web page. The thesis also mentions the installation and operation of the created JMeter software plug-in. The diploma thesis describes the whole process of the development of the plug-in.

This thesis is focused on design of a robotic cell for load testing purposes. At the beginning the aim of work is determined by objective testing. Next part is description of a test object, current work station and the present state of work. Further is determined one variant of solutions and are selected elements of the robotic cell. The design of layout follows especially with regards to safety and is processed simplified risk analysis. The second half of the work consists of developing a driverless robot design of the measuring device. The end of thesis is price calculation.

Continuous delivery is a software development methodology that aims to reduce development cycle time by putting a strong emphasis on automation, quality and rapid feedback. This thesis develops an automated method for detecting performance regressions as part of a continuous delivery deployment pipeline. The chosen method is based on control charts, a tool commonly used within statistical process control. This method is implemented as part of a continuous delivery deployment pipeline and its ability to detect performance regressions is then evaluated by injecting various performance bottlenecks in a sample application. The results from this thesis show that using a control chart based approach is a viable option when trying to automate verification of load test results in the context of continuous delivery. / Kontinuerlig leverans är en utvecklingsmetodik för mjukvara med målet att reducera ledtid genom att fokusera på automatisering, kvalitet och snabb återkoppling. I det här examensarbetet utvecklas en automatiserad metod för att upptäcka försämringar i prestanda i en deployment pipeline för kontinuerlig leverans. Den valda metoden baseras på kontrolldiagram, ett verktyg som ofta används inom statistisk processkontroll. Metoden implementeras som en del av en deployment pipeline för kontinuerlig leverans och dess förmåga att upptäcka prestandaförsämringar utvärderas genom att olika prestandarelaterade flaskhalsar implementeras i en testapplikation. Resultaten från arbetet visar att en metod baserad på kontrolldiagram är ett tänkbart alternativ för att automatisera verifiering lasttestresultat inom kontinuerlig leverans.

Microservices is an architectural technique that has only gotten more popular as the need for scalable and performant internet-based applications has grown. One of the characteristics of microservices is communication through lightweight protocols like HTTP. These protocols are usually provided through frameworks that enable an abstracted form of communication and when implementing services using the Go language, the most common frameworks are gRPC and net/http. The aim of this thesis is to evaluate and compare the performance and usability of gRPC and HTTP frameworks in order to determine which one is better suited for microservices so that developers can be empowered to be more informed when making choices about their technology. We investigated the performance and usability by conducting two experiments. For the first one, we created two services that were implemented as identically as possible using Go but one communicated using the net/http framework and the other using gRPC. The services implemented methods that return small, medium, and large payload sizes and were then load-tested at varying numbers of virtual users. The second experiment was conducted by recruiting a set of participants that were tasked with completing two sets of coding tasks once using gRPC and once using HTTP. After the tasks were completed they were asked to fill out a questionnaire to measure their experience using the frameworks, the answers were then turned into a score which we could use to analyze the frameworks. The results from the performance experiment indicated that gRPC performed better in terms of throughput and latency, while HTTP performed better in scalability, and the results from the usability experiment indicated that HTTP was found to be more usable by the participants.

What is crucial for an alarm server to work correctly? Companies these days are reliant on alarm servers to stay operational continually. Therefore, these servers must be correctly tested. This is where load testing comes in. By performing load testing before placing a server in production, the company can be confident it stays operational even when handling heavy loads. By automating the process, we ensure quality assurance of each test and leave human error out of it. In this thesis, we describe our research regarding Locust, an open-source tool for load testing, the important parts of testing and the methods employed in our software. First and foremost, the research gave us valuable insights into the basic principles of load testing. What aspects must we include, and what tests should we perform? Furthermore, it helped us conclude that Locust is the best open-source tool for our purpose due to its outstanding performance compared to JMeter. Developing the software could then be executed with a mixture of work from the Locust documentation and instructions given by the partner company. The most important aspect of Locust is the load shape construction and metrics to be recorded. Instructions from the partner were for the software to be able to integrate into their CI/CD pipeline (Continuous Integration and Continuous Deployment) and for parameters to be input for scaling the load test. Finally, while metrics are recorded and showcased, the thesis does not evaluate the quality of the alarm server. The metrics showcased are used to ensure the functionality of the test. Instead, the metrics collected will be evaluated in the pipeline by the company in the future. The results achieved fulfilled all the tasks given except for the input parameters that were limited due to the functionality of Locust.

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