Over the past month, the server has been busy trying to re-render all of
the tiles to try to ensure more up-to date maps. This process is more or
less complete now and all of the map tiles should then be at least from
the 1st of December 2011.
As one month old tiles is still not overly satisfying, I am now trying
to re-activate diff based tile expiry again.
The full expiry of all styles remains infeasible for the moment and so I
am trying to introduce expiry slowly to see how far it can be pushed.
As a start, I have activated tile expiry only for the highest zoom
levels (z15 - z18) and then only for the styles that currently are
embedded in one of the wikipedias.
As far as I can tell these are the following styles:
osm-no-labels osm-labels-de osm-labels-ca osm-labels-bg osm-labels-da
osm-labels-el osm-labels-es osm-labels-fa osm-labels-fr osm-labels-it
osm-labels-lv osm-labels-nl osm-labels-no osm-labels-pl osm-labels-ru
germany default hikebike
If anyone knows of a language that I have forgotten, please let me know
and I will include it as well.
So far, it looks like the server can cope with this, although I have
only activated it earlier today. Should it remain this way, I will try
and expand the zoom levels.
As it is critical to reduce the number of low zoom tiles rendered, as
those still kill performance, lower zoom tiles will probably not be
expired as frequently. E.g. perhaps Z14 - Z11 on a daily basis, below
that even only in the background.
We will have to see, though, how performance behaves over time.
Happy new year,