7 Feb 2009 knipknap   » (Journeyer)

Using Federico’s plot-timeline Script With PHP

I am currently trying to profile a PHP application, so I tried to find a way to create a call graph. Since I didn’t want to strace() the entire Apache process (which probably wouldn’t have worked anyway) I remembered a posting that showed how to do it with Mono. So this still depended on strace, but since I liked the plot-timeline.py script from Federico’s performance-tools, I decided to simply fake some strace output.

If you need to do the same, try the following:

  • Add this file to your PHP application.
  • Add some code similar to this:
    unset($tracer);
    $tracer = new CallTracer('/tmp/trace.log');
    function trace($_comment = '') {
      global $tracer;
      $tracer->trace($_comment);
    }
    
  • Sprincle trace() calls accross your source code.
  • Pass the resulting file to plot-timeline like this:
    python plot-timeline.py -o graph.png /tmp/trace.log
  • The result looks something like this:

    Syndicated 2009-02-07 23:02:49 from Debain.org

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