Slide 7 of 24

Profiler:Compiling/Running/Getting Results

• How to compile

  • Use ‘-Mprof=func’ for function level profiling.
  • Use ‘-Mprof=lines’ for basic block level profiling.
    If you are compiling with ‘-O2’, then a basic block might be one to hundreds of source code lines. This option will slow performance maybe by 2x.
    
    If you compile with ‘-O0’, the basic block is 1 line and performance will really suffer overheads, but the relative line number performance should be correct.

• How to run

  • Run the job as usual. Output files are put in subdirectory pmon.out in the current directory by default.

• How to get results

  • Run ‘profile’ (/usr/bin/profile).
  • Run ‘profile -h’ for options.

Acknowledgement and Disclaimer