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

[08-15at]

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

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