[OSM-dev] discrepancy in Tile Server.

[Jon Burgess]

On Tue, 2010-06-22 at 22:33 +0100, Jon Burgess wrote:
> 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 with code/utils that are probably 6 months out of date maybe a bit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. 

Sorry - make that only: 1398104. I added up the wrong column on my
spreadsheet. This makes your Ubuntu numbers seems about right. I'd look
to see whether you are counting the right files on the CentOS setup.


> 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
> 
>