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

[stevo01]

Hi,
> @stevo01 Can you describe in a bit more detail what you are doing? Can you reproduce the problem in a smaller system? I don't have anywhere I could import Europe in and allocate 48Gb to, but if you could reproduce the problem in a smaller container (with less data and less memory) other people might be able to investigate.

I wrote [description ](https://github.com/OpenSeaMap/osm-tileserver/blob/master/Doc/ImportGermany.md) how to setup the docker based tile server with import of osm extract (just germany). This allows you to setup the server in some minutes if docker is available. The initial import of germany needs around 3 hours on my workstation (amd ryzen 1700). 

I triggert the renderer with command 
  render_list -a -m ajt -z 11 -Z 11 -l 800 -n 12

and analysed memory usage of renderd with command:
  pmap 1370 > renderd.memory.001.txt
before tiles where rendered and command
  pmap 1370 > renderd.memory.004.txt
after renderd handled around 65536 tiles. 

The memory consumtion after renderd startup is 2089460K.
The memory consumtion after renderd produced the 65536 tiles is 7725556K.

See attachments for details.
[renderd.memory.001.txt](https://github.com/openstreetmap/mod_tile/files/3631614/renderd.memory.001.txt)
[renderd.memory.004.txt](https://github.com/openstreetmap/mod_tile/files/3631615/renderd.memory.004.txt)
[renderd.stats.txt](https://github.com/openstreetmap/mod_tile/files/3631618/renderd.stats.txt)




 

 



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