[Tile-serving] [openstreetmap/osm2pgsql] Possible performance improvement (#1532)

[Jochen Topf]

Memory that the application has freed is not automatically returned to the operating system, that's totally normal. It depends on the program, the kernel and the C++ runtime how this is handled in detail. So just looking from the outside of the process doesn't tell you how much memory the application has actually still allocated. It might well be that osm2pgsql is not perfect in that regard, but you just can't tell this way.

On the other hand, it doesn't mean that other programs can't use this memory. I don't know enough about Windows, but on Linux the kernel is able to tell that this memory isn't actually in use and it can let other processes use it.

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