[OSM-dev] discrepancy in Tile Server.

[Jon Burgess]

On Tue, 2010-06-22 at 12:13 -0500, Samir Faci (Dev) wrote:
> I'm in the process of updating a tile server switching from a Centos
> with code/utils that are probably 6 months out of date maybe a bit
> more, to a new lucid setup.
> 
> Something similar to:
> http://weait.com/content/build-your-own-openstreetmap-server
> 
> Now, everything works fine, and I use renderd + render_list to
> pre-generate a few zoom levels.
> 
> The part that perplexes me is that it seems that that some of the
> .meta files are missing, compared to the Centos machine.
> 
> I pre-rendered 0-13 and on the Centos machine and it created:  3112877
> meta files.  On the updated Ubuntu setup (which is more current) 0-13
> generated: 1394208.
> 
> Did the algorithm change?  Is there an explanation for the large
> discrepancy besides... just an error in my setup?

According to my maths, the total of all meta tiles for zoom 0 - 13 is
33074069. If the load average on the machine gets too high while doing
the rendering then some tiles can get lost, but it should print a
warning message each time this happens. 

I think render_old will let you run it a second time and it'll just
request the missing tiles to be rendered (provided the planet timestamp
file is older than the ones you generated before).

	Jon