Selfhosted

60810 readers

690 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:

Detailed Rules Post

Be civil.
No spam.
Posts are to be related to self-hosting.
Don't duplicate the full text of your blog or readme if you're providing a link.
Submission headline should match the article title.
No trolling.
Promotion posts require active participation, with an account that is at least 30 days old. F/LOSS without a paywall has exceptions, with requirements. See the rules link for details. Tags [CBH] or [AIP] are required, see the links in Rule 8 for details.
AI-related discussions and AI-involved promotional posts have additional requirements for tagging, as noted in Rule 7 and the AI & Promotional Post Expanded Rules post, and find example disclosures here.

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 3 years ago

MODERATORS

curbstickle@anarchist.nexus

curbstickle_lw@lemmy.world

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

submitted 1 year ago* (last edited 1 year ago) by mesamunefire@lemmy.world to c/selfhosted@lemmy.world

34 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

[–] Coelacanthus@infosec.pub 1 points 11 months ago* (last edited 11 months ago)

I think that most of usefulness of swap has passed now that we have systems with noodles of ram.

Please read this article authored by maintainer of Linux kernel memory management subsystem and cgroup subsystem, Chris Down.

https://chrisdown.name/2018/01/02/in-defence-of-swap.html

And there is another article with some additional informations about swap authored by @farseerfc@sn.angry.im who tranlated the article above to Chinese.

https://farseerfc.me/followup-about-swap.html (only Chinese version available)