Visualisierung der Speicheraktivitaeten von parallelen Programmen in Systemen mit virtuell gemeinsamem Speicher

The concept of virtual shared memory (VSM) was developed in order to simplify the programming of modern parallel computers with physically distributed memory. The memory activities occurring in such an architecture are so complex that we require tools to visualize and understand the dynamic processes to provide a basis for an effective debugging and optimization. In this thesis, a tool is introduced which visualizes the virtual shared memory references in different ways. Graphical representations for specified points in time, which clearly show the communication of memory pages, are implemented as well as time line visualizations that allow the observation of the evolution of system behaviour. The system can automatically generate statistics, and a three dimensional representation of the communication topologies can be used to observe communication activities. Because these VSM components are integrated into PARvis (an existing tool for visualizing process state changes of a parallel computer), an efficient tool has been developed that, by taking into consideration different perspectives, is now able to draw a nearly complete image of the interaction between a parallel program and a parallel computer. (orig.)SIGLEAvailable from TIB Hannover: RA 831(2911) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman