TAU Performanc Tuning Tool头的性能优化工具.pptVIP

TU Munchen TAU Performance Tuning Tool Introduction - What is TAU? Tuning and Analysis Utilities Performance system framework for scalable parallel and distributed high-performance computing Targets a general complex system computation model nodes / contexts / threads Multi-level: system / software / parallelism Integrated toolkit for performance instrumentation, measurement, analysis, and visualization Portable, configurable performance profiling/tracing facility Open software approach University of Oregon /research/paracomp/tau TAU Performance System Architecture General Complex System Computation Model Node: physically distinct shared memory machine Message passing node interconnection network Context: distinct virtual memory space within node Thread: execution threads (user/system) in context Definitions – Profiling Profiling Recording of summary information during execution inclusive, exclusive time, # calls, hardware statistics, … Reflects performance behavior of program entities functions, loops, basic blocks user-defined “semantic” entities Helps to expose performance bottlenecks and hotspots Implemented through sampling: periodic OS interrupts or hardware counter traps instrumentation: direct insertion of measurement code Definitions – Tracing Tracing Recording of information about significant points (events) during program execution Save information in event record timestamp CPU identifier, thread identifier Event type and event-specific information Event trace is a time-sequenced stream of event records Can be used to reconstruct dynamic program behavior TAU Instrumentation Options Manual instrumentation TAU Profiling API Automatic instrumentation approaches PDT – Source-to-source translation MPI - Wrapper interposition library Opari – OpenMP directive rewriting Manual Instrumentation – Using TAU Install TAU % configure ; % make install; Instrument application TAU Profiling API Modify application makefile include TAU’s stub makefile, modify var