[Tile-serving] [openstreetmap/osm2pgsql] Memory released too late for the main cache ? (#1559)

[Christian Quest]

It seems that the memory used by the cache is released late during an osm2pgsql import process.

Once the PG tables are created, I don't think the cache is needed anymore, and the RAM used cannot be used by PG and other caches during the clustering/index creation.

I'm currently finishing a full planet import, and osm2pgsql still uses 65GB of RAM (I allocated 70G for the cache) while line/polygon are creating their index.

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