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

[SomeoneElseOSM]

SomeoneElseOSM left a comment (openstreetmap/mod_tile#477)

> At the moment it feels a lot like `render_list` forces it to do the specified area in one massive request 

`render_list` does indeed say "I would like all of these tiles to be rerendered" but it is your choice which tiles you ask for and (with the "-n" parameter) how many threads you want running in parallel doing that.  

> 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?

There's likely some optimisation at the database side of things but in terms of the running threads, I doubt it.

With regard to "render_list -V"

> render_list: invalid option -- 'V'
> unhandled char '?'

Slightly bizarrely, I can reproduce that (on each of Ubuntu 22.04, Debian 12 and Ubuntu 24.04) with the shipped-with-the OS versions, but not with versions I've built locally.

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?



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