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

[Stephan]

Adding a memory limit will not reduce the memory consumption. What might happen is that the increased memory pressure on this cgroup is leading to pages being dropped increasing the available memory. Either file-backed pages are dropped or anonymous memory relocated to the swap device.

You could try trading CPU for memory by using zram as a target  for swapping. Hopefully most of the allocated memory is not part of the active working set, so the extra cost for swapping to RAM could be tolerabe.

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