[Tile-serving] [openstreetmap/osm2pgsql] Memory usage during phase 2 flex processing (#1535)

[Jochen Topf]

You can't compare the amount of memory used by some Lua structure with how much this will take in the database. Memory usage in Lua will be much larger. That's why there is the warning in the manual. So I do not rule out that the problem you are describing is due to the way we do two-stage processing. 

To figure out where the problem is, I suggest running the exact same config, but with the one line removed where you are actually storing anything in the global variable. The difference you see then should tell you something. There are also ways to ask Lua how much memory it has allocated etc. but this goes beyond the scope here.

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