[Tile-serving] [openstreetmap/osm2pgsql] Memory released too late for the main cache ? (#1563)

[Jochen Topf]

### Discussed in https://github.com/openstreetmap/osm2pgsql/discussions/1559

<div type='discussions-op-text'>

<sup>Originally posted by **cquest** August 31, 2021</sup>
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.</div>

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