Logo des Repositoriums

Auflistung nach Autor:in "Zirkelbach, Christian"

1 - 4 von 4
  • Zeitschriftenartikel
    Combining Kieker with Gephi for Performance Analysis and Interactive Trace Visualization
    (Softwaretechnik-Trends Band 35, Heft 3, 2015) Zirkelbach, Christian; Hasselbring, Wilhelm; Carr, Leslie
    Performing an analysis of established software usually is challenging. Based on reverse engineering through dynamic analysis, it is possible to perform a software performance analysis, in order to detect performance bottlenecks or issues. This process is often divided into two consecutive tasks. The first task concerns monitoring the software, and the second task covers analysing and visualizing the results. In this paper, we report on our performance analysis of the Perl-based open repository software EPrints, which has now been continuously developed for more than fifteen years. We analyse and evaluate the software using Kieker, and employ the visualization tool Gephi for performance analysis and interactive trace visualization. This allows us, in collaboration with the EPrints development team, to reverse engineer their software EPrints, to give new and unexpected insights, and to detect potential bottlenecks.
  • Zeitschriftenartikel
    An Elastic Layers Pattern Approach with Dynamically Added Layers
    (Softwaretechnik-Trends Band 36, Heft 4, 2016) Zirkelbach, Christian; Adolf, Marc
    Cloud environments often provide dynamic resource allocation techniques. These can be used to scale single components or even whole software systems according to their current workload. Fluctuating workloads can occur in different layers of the software architecture and need appropriate handling to meet performance requirements. Scaling workload-intensive components in combination with load-balancing can be used to deal with these issues. Therefore, we present a parallel layers approach, which extends an existing pattern regarding improved elasticity. Based on dynamically adding layers on top of bottleneck layers, we increase the flexibility and performance of related architectures. Furthermore, we describe a first design approach, implementation and an evaluation of the feasibility.
  • Textdokument
    Juggling with Data: On the Lack of Database Monitoring in Long-Living Software Systems
    (Softwaretechnik-Trends: Vol. 37, No. 2, 2017) Zirkelbach, Christian
    Long-living software systems often challenge associated software engineers and operators with changing requirements or increasing workload. In addition, performance issues or customer requests may cause inevitable software updates or refactoring tasks. These legacy systems are often based on outdated technologies and are poorly documented. In combination with insufficient knowledge of the (actual) system, the necessary transformations can be difficult. While the described situation is discussed in the software engineering community, databases are rarely covered. As databases are an essential part in almost every soft- ware system, they are affected by evolutionary tasks as well and have to face the same challenges. In this paper, we (i) describe problems based on non-existing database monitoring in long-living software systems and (ii) propose an approach as a solution, which addresses the described problems, and supports developers and operators in performing evolutionary tasks alike. Finally, we conclude and delineate open questions concerning our envisioned approach.
  • Konferenzbeitrag
    Simplifying Software System Monitoring through Application Discovery with ExplorViz
    (Softwaretechnik-Trends Band 39, Heft 3, 2019) Krause, Alexander; Zirkelbach, Christian; Hasselbring, Wilhelm
    Keeping an overview of software systems is a crucial task in the area of software engineering. Often this task is supported by application performance management (APM) tools, e.g., Kieker, a monitoring framework based on dynamic software analysis. Kieker is highly extensible and customizable, but lacks a user-friendly setup configuration due to its framework characteristic. Based on this obstacle, users of our live trace visualization tool ExplorViz, which employs Kieker, experience problems during monitoring their applications. In this paper, we report on our ExplorViz application discovery and monitoring management system (ADAMMS) to circumvent this drawback. The key concept is to utilize a software agent that simplifies the discovery of running applications within operating systems. Furthermore, the ADAMMS properly configures and manages Kieker instances to monitor these applications. Thereupon, we demonstrate how the monitoring procedure can be eased and how both open source projects ExplorViz and Kieker mutually benefit from our approach. Finally, we conduct a first pilot study to evaluate the usability of our approach with respect to an easy-to-use application monitoring.