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Using the VTune Analyzer on Multithreaded Applications

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Using the VTune Analyzer on Multithreaded Applications. Intel Software College. Objectives. Two uses for VTune Performance Analyzer Improving the efficiency of computation Improving your threading model Example: mandelbrot3.exe. Agenda.

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Using the VTune Analyzer on Multithreaded Applications

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  1. Using the VTune Analyzer on Multithreaded Applications Intel Software College

  2. Objectives • Two uses for VTune Performance Analyzer • Improving the efficiency of computation • Improving your threading model • Example: mandelbrot3.exe Using the VTune Analyzer on Multithreaded Applications

  3. Agenda • Determine if a sample section of code can be threaded • Determine if the implemented threads are balanced or not Using the VTune Analyzer on Multithreaded Applications

  4. Use VTune Analyzer on Serial Applications • Determine what parts of your application (if any) that, when threaded, will speed up your app • CPU-bound apps can potentially run twice as fast on dual-core processors • Memory bound apps may potentially run 50% faster • I/O bound applications may not run any faster • Find main performance bottlenecks in your application (sampling) • Determine whether or not it makes sense to thread there • If not, look further up the program’s calling sequence to find a more appropriate place to consider (callgraph) Using the VTune Analyzer on Multithreaded Applications

  5. Use VTune Analyzer on Multithreaded Applications • Determine if your current threading model is balanced • On the thread view, each of the threads should be consuming the same amount of time • If not, you must shift the amount of work between the threads • Use “Samples Over Time” view • Look for idle CPU time • Could more threads utilize idle resources? • In the process view this can show up as ntoskrnl, or intelppm.sys • Sometimes the process view actually says idle task Using the VTune Analyzer on Multithreaded Applications

  6. Example: mandelbrot3.exe • Single threaded app, analyze to see if it can be made • Demo machine: • Four socket, dual core, hyper-threaded (HT) machine • (4 sockets * 2 cores per socket * 2 HT CPUs per core) = the OS sees 16 processors Using the VTune Analyzer on Multithreaded Applications

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