[Tile-serving] [openstreetmap/mod_tile] render_list does not save any tiles if killed due to running out of memory (Issue #477)

[Simon Williams]

SystemParadox left a comment (openstreetmap/mod_tile#477)

> Did you get anywhere with monitoring memory use while rendering of tiles (either in response to browsing, you in response to `render_list`) was happening?

Well yes I can limit the threads and the area to help keep it within the memory limits. But I still have two issues:

1. `render_list` seems to force it to load everything into memory in an abnormal way and cause excessive memory usage unnecessarily.
2. I'm assuming this is abnormal but I'm not entirely confident that it's not going to suddenly fall over in production if it gets a particularly expensive set of requests at once.

Again, it would be really helpful to have some more information about how memory is allocated and freed so we can better understand what's going on and how more confidence that it won't run out of memory.



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