webgrind_largeWebGrind is a great tool for analyzing your PHP app and finding where slow down is occurring.  As stated on the Google Code site for the project, it is a “ Xdebug profiling web frontend.”  Here’s the steps I took getting it working in MAMP.

Install xdebug (taken from debuggable):

  1. Download the latest Xdebug binaries for your OS from Komodo.  They will be labeled as “PHP Remote Debugging” for Mac OS X.  When you unzip it, you’ll see the xedbug.so file.
  2. Copy the xdebug.so for your PHP version to your extensions directory (/Applications/MAMP/bin/php5/lib/php/extensions/no-debug-non-zts-20050922/xdebug.so)
  3. Find your php.ini file (Applications/MAMP/conf/php5/php.ini)
  4. Add the following lines to your php.ini configuration (MAMP):

[xdebug]
zend_extension=/Applications/MAMP/bin/php5/lib/php/extensions/no-debug-non-zts-20050922/xdebug.so

Enable xdebug
Note, you don’t want to do this in a production environment.  Add the following to your php.ini file:

xdebug.profiler_enable = 1

Install webgrind (from the install wiki)

  1. Download webgrind
  2. Extract to a directory in the web root
  3. Browse pages of your site
  4. View the directory webgrind lives in.

That’s it!  There is some useful additional ini settings I found in this blog post:

# Set the filenames generated by xdebug to use REQUEST_URI instead
# of the apache process number
# so all requests to the same page end up in the same file.
xdebug.profiler_output_name = cachegrind.out.%R
# Set xdebug to append data to files instead of overwriting,
# this means you can view aggregate
# function calls over multiple requests.
xdebug.profiler_append = TRUE

I’ve already found some major instances of slowdown that can be cleaned up in the application I’m testing.