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?
I wonder if this is the cause for the UI failing and showing a white page with “server error”. It has something to do with a failure to retrieve the site icon and if postgres is crashing that could explain why lemmy-ui is failing to retrieve the site icon.
My current “fix” for this is a script that runs every 10 minutes and sets the site image to NULL, curls the site URL, then sets the site image back to what it was. This does seem to work around the problem and if the UI does crash it’s only down for a maximum of 10 minutes.