Drupal Profiling with XHProf on Ubuntu 11.10 + Memcached and Varnish

1. Install memcached, varnish, and xhprof

   sudo apt-get install memcached
   sudo apt-get install php5-memcached
   sudo apt-get install varnish
   sudo pecl install php-xhprof

2. Install xhprof front-end

   cd /var/www
   git clone https://github.com/facebook/xhprof.git

3. Configure Apache and Varnish ports

   sudo vim /etc/apache2/ports.conf ; // Change 80 to 8080
   sudo vim /etc/apache2/sites-available/default // Change 80 to 8080
   sudo vim /etc/default/varnish // Change 6081 to 80

4. [Re]start services

   sudo service memcached start
   sudo service varnishd start
   sudo service apache2 restart

5. Download and install memcache, varnish (and devel) drupal modules:

   drush dl memcache varnish devel -y

6. Configure Drupal for Memcached

   sudo vim .../sites/site/settings.php:
   $conf['cache_inc'] = '/path/to/memcache/module/cache.inc';
   Configure settings at /admin/settings/memcache

7. Configure Drupal for Varnish

   Get contents of /etc/varnish/secret and settings from /etc/default/varnish
   Enter them at /admin/settings/varnish.

8. Configure Devel module for XHprof integration:

   Enable XHprof integration (checkbox).
   Enter path to xhprof and xhprof_html at /admin/settings/devel.

Now see XHProf output link at bottom of pages.

Resources

1. http://transparatech.com/blog/xhprof-install-secrets-revealed-oooh
2. http://code.google.com/p/memcached/wiki/NewStart
3. http://drupal.org/node/946182