[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add grouped-linemerge generalization (PR #2482)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2482)

If I understand this correctly you tested this on Los Angeles, did you also run tests on the full planet (or larger areas)? From my experience it is often the case that something works fine on a small dataset because basically the whole dataset fits into memory, but performance goes dramatically down if you run it on the full planet, even though each individual query only looks at local data.

Generally the performance requirements are that we need to be able to keep up with minutely changes on a reasonable machine. And ther still needs to be enough capacity left so that we can do the actual querying of the database for rendering. That's rather vague, I know.

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