Joachim Herber, B. Sc.

Member of the Team Immersive Visualization Services


Cirque des Bouteilles: The Art of Blowing on Bottles

Daniel Zielasko, Dominik Rausch, Yuen Cheong Law Wan, Thomas Knott, Sebastian Pick, Sven Porsche, Joachim Herber, Johannes Hummel, Torsten Wolfgang Kuhlen
Proc. of IEEE 10th Symposium on 3D User Interfaces (2015)

Making music by blowing on bottles is fun but challenging. We introduce a novel 3D user interface to play songs on virtual bottles. For this purpose the user blows into a microphone and the stream of air is recreated in the virtual environment and redirected to virtual bottles she is pointing to with her fingers. This is easy to learn and subsequently opens up opportunities for quickly switching between bottles and playing groups of them together to form complex melodies. Furthermore, our interface enables the customization of the virtual environment, by means of moving bottles, changing their type or filling level.

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Visualization of Memory Access Behavior on Hierarchical NUMA Architectures

Benjamin Weyers, Christian Terboven, Dirk Schmidl, Joachim Herber, Torsten Wolfgang Kuhlen, Matthias Stefan Müller, Bernd Hentschel
Proceedings of the First Workshop on Visual Performance Analysis (2014)

The available memory bandwidth of existing high performance computing platforms turns out as being more and more the limitation to various applications. Therefore, modern microarchitectures integrate the memory controller on the processor chip, which leads to a non-uniform memory access behavior of such systems. This access behavior in turn entails major challenges in the development of shared memory parallel applications. An improperly implemented memory access functionality results in a bad ratio between local and remote memory access, and causes low performance on such architectures. To address this problem, the developers of such applications rely on tools to make these kinds of performance problems visible. This work presents a new tool for the visualization of performance data of the non-uniform memory access behavior. Because of the visual design of the tool, the developer is able to judge the severity of remote memory access in a time-dependent simulation, which is currently not possible using existing tools.

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