Hi, I'm getting some big problems with memory on a VPS with 1024 MB burst memory but 512 MB guaranteed. Most of the RAM is being taken up by cached memory, and it seems like the OS thinks it has enough RAM so it doesn't clear this cached memory; but then, when it has to do something like fork for an operation, it fails because there's not enough RAM.
I was wondering how to configure the cached memory behavior (setting a limit on it or something) in /etc/sysctl.conf; I found some things from DuckDuckGo but they weren't very clear.