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

[Stephan]

Windows taskmanager is much improved in Windows 10, but certainly not perfect. Process Explorer from Sysinternals gives some additional hints.

In which "column" of Task manager did you see the memory still allocated? What was it named? Is it called private active working set?
In this case I would also suspect that osm2pgsql still has it's fingers on it.

As Jochen mentioned osm2pgsql is supposed to return the memory. I have not checked the code, but assuming it is doing new/delete on the heap. So it would be the task of the heap memory management of the runtime to return this to the operating system.

read here on how Windows handles this: https://docs.microsoft.com/en-us/windows/win32/memory/working-set

So if you really see a persistent high working set, even in a situation where osm2pgsql already deleted the memory, then it would be worth investigating further. I would then suppose this being an issue with the specific runtime used here in the windows version.

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