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I have a server that is dedicated to running a web site based on Joomla. It is being monitored using munin. The slab cache and the cache change abruptly. There are no notable changes in the Apache load. It is not clear that memory is being used efficiently. Why would this happen? The web server is Apache and PHP-FPM is also installed. The database is on another server, so there is no DB on this server. Munin says the PHP-FPM memory is relatively constant. I can tell what the slab cache is being used for at a particular moment with slabtop, but not why it abruptly changes. The memory for the last 24 hours is: enter image description here

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