Setting up xhprof on Moodle
The following instructions are for setting up xhprof for Moodle under a Ubuntu/Debian environment. The process should be similar for other linux enviroments, but will need some tweaking if you wish to do this under windows. Please update this document if you find any major problems.
mkdir ~/src/ cd ~/src/ wget http://pecl.php.net/get/xhprof-0.9.2.tgz tar xvf xhprof-0.9.2.tgz cd xhprof-0.9.2/extension/ phpize ./configure make sudo make install
Add the following to the apache version of you php.ini file
[xhprof] extension=xhprof.so xhprof.output_dir="/var/tmp/xhprof"
sudo service apache2 retart
Create a file in your web root that makes a call to phpinfo(); and then view the result in your browser to make sure that xhprof is enabled in PHP. Checking the output of php -m would also work if you are sure that the command line version of PHP uses the same php.ini file as your web server.