Prequesistes: You need the memcached extension installed, compiled with the igbinary option. (If you don't have this, discuss with Dan, don't waste a load of time configuing it) You should run the memcached server for testing. You should have the performance footer enabled in your moodle showing cache hits/misses etc. Go to Home /  ▶ Site administration /  ▶ Plugins /  ▶ Caching /  ▶ Configuration In * Memcached * click on 'add an instance' Give it a name, set your memcached server (127.0.0.1) leave all other options as default Edit the memcached store you just created Change the serialiser to 'the igbinary serialiser' and save store Go back to the edit page of that store VERIFY: the igbinary serialiser is selected Change to the default php serialiser and save Go back to the edit page of that store VERIFY: the default serialiser option is selected Go back to the cache config page Click 'edit mapping' on Language string cache Change the primary store to your memcached store Browse around Moodle a bit VERFIY: you see some hits in the cachestore_memcached under the core/string cache in the performance footer.