[Tile-serving] [osm2pgsql-dev/osm2pgsql] Any reasons why osm2pgsql doesn't leverage parallelization during huge maps import (eg: whole world)? (Discussion #2090)

[ghevge]

But I'm not seeing any bottlenecks at the Disks level. It max out at about 17 MB/s when loading the planet data. Where the theoretical SSD max limit is about 600 MB/s

![disk](https://github.com/osm2pgsql-dev/osm2pgsql/assets/42102616/58280073-6dbe-407d-88f4-06c389b9d078)

The CPU is the suspect here as it only goes up to about 6 % load.

![CPU](https://github.com/osm2pgsql-dev/osm2pgsql/assets/42102616/00711d22-eed1-423d-b1b1-d0b4ea909732)


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