[Tile-serving] [openstreetmap/mod_tile] memory consumption (#181)

[stevo01]

> Have done a whole Europe import and am now trying to prerender the tiles using reder_list.
> This works fine until ZoomLevel 10.
> I have 6 threads running and renderd consumes about 10-15GB.
> around tile 528 memory consumption jumps to more than 48GB which causes oom_killer (renderd runs in a proxmox CT) to kill renderd.
> Jun 5 08:38:17 renderd renderd[1882]: Rendering projected coordinates 10 528 368 -> 626172.135713|5322463.153556 939258.203569|5635549.221413 to a 8 x 8 tile
> Jun 5 08:40:29 renderd systemd[1]: renderd.service: Main process exited, code=killed, status=9/KILL
> Is this a mod_tile/renderd or mapnik issue. Can I do something about this ?
> thx

I can reproduce the descriped behaviour with my installation. I am using docker project for setup of the tileserver and observed high RAM memory consumption of the container. A closer look into container shows that memory consumtion of renderd seems to grow up over the time until oom killer stops the service. Have found a solution / workaround for that?

note: There is another user who reportet this [issue](https://github.com/Overv/openstreetmap-tile-server/issues/27).


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