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

[suneet-nokia]

I'm facing similar issue while rendering tiles for zoom-level(Z)>14
`render_list -n 64 -s /var/run/renderd/renderd.sock -z 15 -Z 15 -m ajt -a`
I have allocated 180GB RAM for PostGIS but all of it gets consumed and the db server restarts.

![image](https://user-images.githubusercontent.com/71066412/106238861-9fd95880-6227-11eb-9248-76474d5d3a82.png)

I went inside the db shell and checked all the processes, not sure if this is normal :/
![image](https://user-images.githubusercontent.com/71066412/106239642-f85d2580-6228-11eb-8905-e3490f13bef9.png)


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