After successfully enabling it, how do you know it's working? And how do you know how much better performance is increased?
In homepage of https://www.drupal.org/project/memcache it says:
- A module that provides a comprehensive administrative overview of Drupal's interaction with Memcached and stats.
- A set of tests that can be run to test your memcache setup.
But there is nothing for Drupal 8.
If you read docu http://cgit.drupalcode.org/memcache/tree/README.txt?h=8.x-2.x there is no information how to test/confirm memcache is doing its job.
It shows in Status report it's enabled.
Memcached version 3.0.0 But how do you know it's not just hanging around or idling?
Anyway, I read the 7.x docu and it had this:
## CACHE HEADER ## Drupal core indicates whether or not a page was served out of the cache by setting the 'X-Drupal-Cache' response header with a value of HIT or MISS. If you'd like to confirm whether pages are actually being retreived from Memcache and not another backend, you can enable the following option: $conf['memcache_pagecache_header'] = TRUE;
So I put in
$settings['memcache_pagecache_header'] = TRUE;, but I don't see anything in my Network tab of Firefox's dev tools. All I see is
X-Drupal-Cache UNCACHABLE with or without the setting.