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Lemmy instance using a lot of ram (reddthat.com)
submitted 9 months ago by youpie_temp@reddthat.com to c/selfhosted@lemmy.world
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I have my own Lemmy instance (Lemmy.emphisia.nl) but I had to take it offline, after running a while it was using more than half of the system memory (16gb in total). Causing the computer to crash as there are a lot of other services also running on it. The problem appears to come from postgress. In btop I can see it spawning a lot of processes all taking up about 80 MB in the beginning but rising as it runs, rising as high as 250 MB per process. I have already tried adjusting the postgress config to be optimized for less memory, but it seems to do nothing.

Is this normal, and if not, what is going wrong?

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[-] poVoq@slrpnk.net 2 points 9 months ago

I have been running a cron script to automatically restart the lemmy backend, which in turn resets the postgres memory use ever since this problem started to happen months ago. For me 0.19.x actually made it less bad, but it is still an annoying issue.

[-] redcalcium@lemmy.institute 3 points 9 months ago

Try limiting the database connection pool size too in lemmy.hjson. It helped a lot in my instance. I set mine to 30 in a small server with 8gb ram. You can set it to even lower value for lower postgres memory consumption.

database: {
        host: dbhost
        user: "lemmy"
        password: "secret"
        database: "lemmy"
        pool_size: 30
}
this post was submitted on 31 Jan 2024
49 points (100.0% liked)

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