Selfhosted

46172 readers

414 users here now

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.

Rules:

Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.
No spam posting.
Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.
Don't duplicate the full text of your blog or github here. Just post the link for folks to click.
Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).
No trolling.

Resources:

selfh.st Newsletter and index of selfhosted software and apps
awesome-selfhosted software
awesome-sysadmin resources
Self-Hosted Podcast from Jupiter Broadcasting

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 2 years ago

MODERATORS

[email protected]

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 [email protected] to c/[email protected]

33 comments fedilink hide all child comments

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.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 5 points 2 weeks ago (1 children)

I though that the recommended swap partition was to double until 16 GB? So at 32GB of ram use 32GB of swap?

[–] [email protected] 10 points 2 weeks ago

You should just maintain awareness of how much you're using. I think 32gb ram + 32gb swap is ridiculous, frankly. Fedora by default sets zram up to 8gb, with no other swap space configured. Works very well that way.

Personally I'd also probably not ever set up more than 16gb of swap space. If I'm somehow hitting that limit it's because I actually just need to buy more RAM.