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Vampir and VampirTrace: Event Tracing and Visualization

ASC Tri-Lab Code Development Tools Workshop Thursday, July 29, 2010. Vampir and VampirTrace: Event Tracing and Visualization. Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, CA 94551.

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Vampir and VampirTrace: Event Tracing and Visualization

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  1. ASC Tri-Lab Code Development Tools Workshop Thursday, July 29, 2010 Vampir and VampirTrace: Event Tracing and Visualization Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, CA 94551 This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 LLNL-PRES-426128

  2. Profiling vs Event Tracing • Profiling • Easy to use, low overhead, small files • Statistical information • Event Tracing • High overhead • Application perturbation • Trace file storage • Fine detail • Time-based effects • Flexibility

  3. Trace generation with VampirTrace • Developed by the Center for Information Services and High Performance Computing (ZIH) of TU Dresden • Open Source library (BSD license) • LLNL-funded OTF trace format • Provides tracing functionality for a large set of metrics • MPI • Threads: OpenMP and pthreads • Application function entry/exit • Performance Counters • Memory and I/O Tracing • Profiling mode

  4. Vampir trace analysis & visualization • Proprietary trace analysis and visualization tool • Includes • Summary • Timelines • Global • Process • Charts • Communication grid

  5. Usage • Re-build application with VampirTrace wrapper scripts • C : vtcc –vt:cc mpicc • Fortran : vtf77 –vt:f77 mpif77 • C++ : vtCC –vtcxx mpiCC • Options : vtcc –vt:help • No application instrumentation : -vt:inst manual • Run application • Examine trace data with Vampir or VampirServer • vampir test_HPCCG.otf • vng • srun –n 4 –ppdebug vngd

  6. How to examine performance data? • Vampir Summary Chart

  7. How to examine performance data?

  8. How to examine performance data?

  9. How to examine performance data?

  10. Availability

  11. Availability

  12. How to reduce tracing overhead? • Trace generation (VampirTrace) • Tracing limits • 32MB trace buffer • Default is to deactivate tracing when buffer is full. • Event filter • Run-time filter file • vtfilter command • Trace Visualization (VampirServer) • Client/Server model for viewing very large tracefiles

  13. References • Vampir • http://www.vampir.eu • VampirTrace • http://www.tu-dresden.de/zih/vampirtrace

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