[Geocoding] how to estimate hardware needed for nominatim osm2pgsql

[Josip Rodin]

Hi,

I observed an issue with Nominatim import performance that is described
at https://github.com/openstreetmap/Nominatim/issues/954

Long story short - on the same machine, ways processing is egregiously
slower than node processing; when I import the nodes for all of Europe,
the ways get processed at a rate of 30/s; when I import the nodes for
just France, the ways get processed at 27700/s.

How does one go about debugging that? The documentation doesn't help much.

I could let it drag along once at 30/s, but I don't want the same situation
to persist with the updates later, which could render the whole setup useless.

There's reports online that avoiding OVH Ceph storage would help. Would it?
There doesn't seem to be any obvious variation to its behavior that could
be directly attributed to it.

There's an implication in the hardware requirements that having more memory
would be helpful. Would that do the trick? I'm seeing the same memory usage
graph with both inputs.

TIA.

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