Annai/PMA Instrumentation Instrusion Presentation

Performance monitoring in the Annai tool environment for distributed-memory parallel computing systems is achieved through a flexible combination of different types of instrumentation. Latent instrumentation in the communication library and inserted in executables by the compilation system can be dynamically configured during program execution. Analysis of the subject program and knowledge of the associated intrusion and costs allows Annai to guide the user in selecting appropriate instrumentation. Instrumentationprocessing and transport costs are also explicitly available as part of Annai/PMA performance analysis and visualizations, such that they can be clearly accounted for and their potential impact on program execution considered. While it is not possible to completely eliminate or compensate for instrumentation intrusion, Annai provides an integrated environment where intrusion is explicitly recognized and can be minimized as part of detailed parallel program performance analysis.