I don't think the I/O depth matters very much for osm2pgsql, at least on the
machine I'm using. With 400GB RAM everything is in memory, so there's literally
no read I/O at all. It might matter for writes, but those generally happen
through page cache, so it's up to the kernel to figure this out. And it's
happening in the background (e.g. in checkpointer), not in the backend.
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