[Tile-serving] [openstreetmap/osm2pgsql] Ambiguous -C/--cache switch in man page? (Discussion #1588)

[Jochen Topf]

You can set the `-C, --cache` option in non-slim mode, it just isn't doing anything. Osm2pgsql ignores it in that case, because in non-slim mode all the nodes are in RAM anyway, so using the cache would use *more* memory without any actual benefit. In earlier versions of osm2pgsql this was actually the case: The cache was used, essentially storing some data twice.

I agree that the documentation is confusing and the manual on osm2pgsql.org is partially wrong, so that's definitely something we need to improve.

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