The Memcache Admin Drupal module (included in the Memcache API and Integration project) provides statistics about how Memcached is behaving on your application. By analyzing these statistics, you can decide whether or not you need to allocate more memory to Memcached on your infrastructure.
For FedRAMP-compliant customers in Cloud Next environments, the Memcache Admin module does not work properly. This happens because Cloud Next environments have the mcrouter component. For more information, visit Memcached and Acquia hosting. As a workaround, use SSH to access an environment, and use the acquia-memcache stats CLI command to access Memcached statistics.
To use the Memcache Admin module:
Review the Memcache statistics page to determine how the cache is behaving. This page reports the following:
Number of evictions since the last time the service was started or the stats were reset.
Compare the ratio of evictions to total Memcached activity. If evictions are a high proportion of total Memcached activity, consider whether you should allocate more memory to Memcached. Bear in mind, however, that if you allocate more memory to Memcached on your infrastructure, you’ll have less memory for other infrastructure functions, including PHP. Proper memory allocation depends on your application configuration.
For more information, visit this Knowledge Base article about monitoring and flushing Memcached.
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