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

[alvesjc]

Hello.

I'm having issues also. In my case renderd is eating all it cans until it crashes.

It's now running with following command:
render_list -n 2 -s /var/run/renderd/renderd.sock -z 7 -Z 8 -m ajt -a

   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 38773 maprend+  20   0 22.337g 0.021t   3700 S  30.0 68.4   8:23.98 /usr/local/bin/renderd -c /usr/local/etc/renderd.conf
 39413 postgres  20   0 9009004 8.340g 8.151g R  95.0 26.6   5:21.39 postgres: 10/main: maprender gis [local] SELECT
 39412 postgres  20   0 8925180 8.241g 8.153g R  72.0 26.3   9:42.41 postgres: 10/main: maprender gis [local] SELECT

It's consuming already 22G RAM. I've 1G left only, sometimes goes to less.
The system as 32Gram, the remaining is allowed for the database.

Would be good to have a way to limit the amount of memory it tries to use.

Let's see if I can manage to have this running  with only 2 threads.

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