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A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Linux aggressively caches things.
4 GB of RAM is not running out of memory.
If you start using swap, you're running into a situation where you might run out of memory.
If
oomkillerstarts killing processes, then you're running out of memory.Is there a good way to tell what percent of RAM in use is used by less important caching of files that could be closed without any adverse effects vs files that if closed, the whole app stops functioning?
Basically, I'm hoping htop isn't broken and is reporting I have 8GB of important showstopping files open and everything else is cache that is unimportant/closable without the need to touch SWAP.
This is the job for the OS.
You can run most Linux systems with stupid amounts of swap and the only thing you'll notice is that stuff starts slowing down.
In my experience, only in extremely rare cases are you smarter than the OS, and in 25+ years of using Linux daily I've seen it exactly once, where
oomkillerkilled runningmysqldprocesses, which would have been fine if the developer had used transactions. Suffice to say, they did not.I used a 1 minute cron job to reprioritize the process, problem "solved" .. for a system that hadn't been updated for 12 years but was still live while we documented what it was doing and what was required to upgrade it.