Profiling

Profiling

• 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

Developed by the Center for Information Services and High Performance Computing (ZIH) of TU Dresden

• 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

Proprietary trace analysis and visualization tool

• Proprietary trace analysis and visualization tool

• Includes

• Summary
• Timelines
• Global
• Process
• Charts
• Communication grid

Re-build application with VampirTrace wrapper scripts

• 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

• Vampir Summary Chart

Trace generation (VampirTrace)

• 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

Vampir

• Vampir

• http://www.vampir.eu

• VampirTrace

• http://www.tu-dresden.de/zih/vampirtrace