[Tile-serving] [openstreetmap/osm2pgsql] Long import of Europe data file (#676)

[Paul Norman]

> Our hard disk is double WD2000FYYZ-01UL1B2 and 32 GB RAM

These are 7200 RPM drives, so won't have great IO performance.

> Is it worth restarting this now or is it better to wait?

Probably best to restart now. Both flat nodes and cache will give speed gains. In particular, larger cache will will avoid the need for so much IO on the slow drives, and flat nodes tends to work well on HDDs.



> Will this have any impact on the data or just speed of importing? 

It might result in some rounding differences, but shouldn't impact the data.

> Could you explain what is "hand-crafted mercator conversation" ?

It doesn't call GEOS, but instead uses code internal to osm2pgsql.

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