You will need a site with say... 100 courses with students (you can use admin/tool/generator/cli/maketestsite.php) Here you have a patch to help you test this issus: Cherry pick the testing commit (it just displays memory usage info) git fetch git://github.com/dmonllao/moodle.git MDL-60434 _master-test ; git cherry-pick MDL-60434 _master-test (better than pull, I don't want to keep updating this commit base) Go to "Site admin > Analytics > Analytics models" and look for "Students at risk of dropping out" modelid (you can find it in any of "Actions" menu links Execute php admin/tool/analytics/cli/evaluate_model.php --modelid= {MODEL_ID_HERE} # You should see a before: and after: ; the difference between these 2 values should not be significant (in a test site without thousands of courses I get around 200KB difference) # Revert this issue's patches (do not purge caches) # Execute again php admin/tool/analytics/cli/evaluate_model.php --modelid={MODEL_ID_HERE} You should see a before: and after: ; the difference between these 2 values should be bigger than before (in a test site without thousands of courses I get around 1.8MB difference)