5) Debugging and Profiling (XHProf, etc)

See drupalquickstart's Channel on Youtube for details on how to debug in Netbeans, and profile with XDebug and Webgrind.

Here's a short version of how to get XHProf to profile your Drupal 7 site.

From the command-line install the devel module with drush:

cd ~/websites/example.dev
drush dl devel
drush pm-enable devel

Then login to the site and configure it: http://example.dev/admin/config/development/devel

Check "Enable profiling of all pages ..."
xhprof directory: /home/quickstart/websites/logs/xhprof
xhprof URL: http://localhost/xhprof
Click "Save"

At the bottom will be a link to "XHProf..."

Click this to view the profile information for that page.

IMPORTANT! While XHProf is on, it will save a profile image for every page load (~ 150k). If you leave it on, these old profiles will start to add up.

To clean out these old profiles, do this:

sudo rm ~/websites/logs/xhprof/*.*