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Why is my server using all my Swap but I have RAM to spare? (lemmy.world)

submitted 2 weeks ago* (last edited 2 weeks ago) by mesamunefire@lemmy.world to c/selfhosted@lemmy.world

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This is an old desktop I use for some small self hosting services. I never use all my RAM and I don't see any RAM spikes other than when I install/compile things which I haven't done in months. I restarted the machine a couple of times, but the SWAP will eventually go right back up to 100%.

I have an Ubuntu server/yunohost setup and found: https://askubuntu.com/questions/157793/why-is-swap-being-used-even-though-i-have-plenty-of-free-ram

My cat /proc/sys/vm/swappiness value is indeed 60. Im not sure what would reduce the SWAP space usage.

Would changing this swappiness value help? Anyone come across this issue before?

EDIT: Found out what it is, its the matrix server that is running on the system. Its taking up a significant amount of swap. Found out via:

smem -s swap -r -p

turning that off, the system is now using 90% less SWAP. /opt/yunohost/matrix-synaps was the process.

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[–] sugar_in_your_tea@sh.itjust.works 18 points 2 weeks ago

It also takes a while to move stuff between RAM and disk, so it'll park stuff in swap of it's not used much to make room for burst RAM needs.

Generally speaking, don't worry about it as long as the system is responsive, but if things start sucking, consider closing stuff so the kernel can free it.