Profiling setup

  • Install xdebug (see Stack installation on CentOS 5)

    • Configure with the option:

      xdebug.profiler_enable_trigger = 1

    • Do not enable any other profiling option.

  • Install cg2dot.py (via xdebugtoolkit)

  • Install graphviz

  • Install ghostscript

Running load tests

  • Clear out CacheGrind results from /tmp.

  • Make a single request:

    ab -n 1 -c 1 [url]&XDEBUG_PROFILE=1

  • CacheGrind output will be on /tmp.

Processing results

  1. Initial setup (do this once):

    svn co http://xdebugtoolkit.googlecode.com/svn/tags/0.1.5/xdebugtoolkit/ ~/xdebugtoolkit echo "export PATH=~/xdebugtoolkit:$PATH" >> ~/.bashrc

  2. Convert the cachegrind output to a .dot file:

    cg2dot.py cachegrind.out.XYZ > cg.dot

  3. Convert the .dot file into PDF-compatible PostScript:

    dot cg.dot -Tsvg -ocg.svg

  4. The SVG will be named cg.svg.