[Tile-serving] [openstreetmap/osm2pgsql] Improved debug information about memory use of Lua (PR #1696)

[mmd]

Right. I think it doesn't really matter if you run this analysis inside your Lua code, or a custom allocator, both options are feasible.

Regarding controlling the maximum memory consumed by Lua (and thereby simulating out of memory conditions), I could trigger a segfault in `push_osm_object_to_lua_stack` -->  lua_pushstring didn't get any memory, and eventually called abort().

I'm not sure how relevant this is in real life. In case you want to take a look for yourself, I've uploaded the prototype code here: https://github.com/mmd-osm/osm2pgsql/tree/prototype/customalloc

Anyway, that's probably a topic for another issue...






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