View detailed system information and keep track of your WordPress memory usage, including peak and current usage, and have e-mail notifications sent i
This is actually a feature of TPC! Memory Usage that you can adjust or turn off at will. TPC! Memory Usage will send notifications if the memory usage of PHP exceeds the preset amount (defaults to 32MB). You can change this under Notifications on the Settings page.
A checkpoint is any WordPress action (also known as a hook) at which memory usage is measured. A list of WordPress actions can be found at http://codex.wordpress.org/Plugin_API/Action_Reference. Most plugins also use their own actions, and a checkpoint can be created using those as well.
This can happen for either one of two reasons. First, make sure that this feature has been enabled and you are looking in the correct place. A quick search for 'Memory Usage' (w/o the quotes) may help you find the data; however, if this doesn't work you will have to make sure that the
wp_footer() functions or actions are called within the theme you are using. Some themes do not include out-of-the-box support, so you may have to add the
wp_footer() functions to the theme templates yourself.