Using Dynamic Kernel Instrumentation for Kernel and Application Tuning
International Journal of High Performance Computing Applications
Early experiences with KTAU on the IBM BG/L
Euro-Par'06 Proceedings of the 12th international conference on Parallel Processing
Introducing the open trace format (OTF)
ICCS'06 Proceedings of the 6th international conference on Computational Science - Volume Part II
The VampirTrace plugin counter interface: introduction and examples
Euro-Par 2010 Proceedings of the 2010 conference on Parallel processing
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Analyzing the scheduling behavior of an operating system becomes more and more interesting because multichip mainboards and Multi-Core CPUs are available for a wide variety of computer systems. Those system can range from a few CPU cores to thousands of cores. Up to now there is no tool available to visualize the scheduling behavior of a system running Linux. The Linux Kernel has an unique implementation of threads, each thread is treated as a process. In order to be able to analyze scheduling events within the kernel we have developed a method to dump all information needed to analyze process switches between CPUs into files. These data will then be analyzed using the VAMPIR tool. Traditional VAMPIR displays will be reused to visualize scheduling events. This approach allows to follow processes as they switch between CPUs as well as gathering statistical data, for example the the number of process switches.