SystemParadox left a comment (openstreetmap/mod_tile#477)
Limiting the number of threads seems to help a lot. Does this mean there is no
shared memory between threads so if two threads try to render tiles for a
similar area they'll both load everything into memory?
I still don't understand why this works ok for less threads or when splitting
it up into smaller chunks, but doesn't work if you call `render_list` with a
large area and many threads. Some more detail about how memory is allocated and
freed would be helpful.
At the moment it feels a lot like `render_list` *forces* it to do the specified
area in one massive request that has to be loaded completely into memory at
once. I would expect it to just add all the relevant tiles to the render queue
and render them in the same way as when someone loads them from the map?
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