[Geocoding] Slow catching up

[Simon Nuttall]

When I started the installation of a whole planet Nominatim, back in
early December the initial planet file was already 3 weeks old.

This was compounded by having an invalid:

/Nominatim/settings/configuration.txt

left over from a previous import run, which I did not discover until
several weeks later.

So when I fixed that Nominatim was about 6 weeks behind.

It is going to take about 6 weeks to catch up because it seems to take
almost an hour to update an hour's changeset, eg these couple of lines
of output:

2014-01-26 09:18:42 Completed index step for 2013-12-05T13:29:02Z in
26.8 minutes
2014-01-26 09:18:42 Completed all for 2013-12-05T13:29:02Z in 45.85 minutes

The machine is i/o bound.

During setup.php I used --threads=2 which made things faster.

Can more threads be used during update.php - eg I notice there is this option:

--index-instances

but would that make a difference?

Simon