Daniel, the only real difference between serving every available language
and serving just one is cache fragmentation, and that's may be different in
your case.

The vector tiles get pre-generated the same way, and they simply contain
all languages instead of one. Disk space wise, the difference is

Kartotherian dynamically picks the language during the rendering. There is
some (not yet measured, but hopefully very small) performance penalty doing
dynamic language picking, but that should not be a big impact in case of a
good caching in front of the rendering.  I would recommend simply putting a
few Varnish boxes in front of your rendering servers if you are ok with the
maps being a bit stale.

On Fri, May 4, 2018 at 2:32 AM Daniel Koć <daniel@koć.pl> wrote:

> W dniu 04.05.2018 o 01:17, Joe Matazzoni pisze:
> > b) how many server resources do you need for rendering <n> languages
> > that you want to support (not the software stack used)?
> >
> > ?? Are you asking about OSM resources or WMF resources?
> I mean WMF resources.
> I'm asking because we want to have localized maps in OSM too and
> rendering just one (default) raster style eats most of the resources of
> 4 servers. This would not work for (let's say) 300 language versions, of
> course.
> We refresh default rendering in minutes usually, but even if we use more
> relaxed times for localized maps, it's still too much - with 1 language
> per day we would refresh them all once a year...
> We think about vector style migration lately, so it might help here, but
> I don't think this will work like 100x times faster.
> --
> "My method is uncertain/ It's a mess but it's working" [F. Apple]
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