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

[duerk-de]

Hi, is there any progress?
I am experiencing unlimited memory consumption already for some years. Here is am image showing current total memory comsumption of my machine (orange):
![Untitled](https://user-images.githubusercontent.com/74491276/99192817-5bd0ce80-2775-11eb-823d-2173123cb28c.png)
The footprint is mainly due to the renderd service. The two jumps upwards are caused by map serve/render request threads. The jump down caused by oom killing renderd.
The memory consumption is somehow very similar to the size of map tiles served. Are there tile caching mechanisms used? I found code using memcached but libmemcached is not installed on my machine. Are there other cache mechanisms?

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