[OSM-dev] running a local server

[Artem Pavlenko]

On 11/2/07, Andy Allan <gravitystorm at gmail.com> wrote:
> On 11/2/07, Keith Sharp <kms at passback.co.uk> wrote:
> > On Fri, 2007-11-02 at 11:21 +0000, Andy Allan wrote:
> > > If you're running a low-bandwidth, limited area map, it's 100 times
> > > easier than this. Pre-render your tiles (or just copy them from the
> > > main tileserver) and just put them in the correct hierarchy on your
> > > webserver, e.g.
> > >
> > > http://example.com/12/2173/1398.png
> > >
> > > Openlayers will then make straightforward HTTP requests for the tiles,
> > > and your webserver will simply reply with the file from the
> > > filesystem. This is how it works for the cycle map - all the images
> > > are prerendered on a machine at home, and then uploaded to a dumb
> > > webhost that is nothing more than apache serving .png files.
> >
> > I have a few of questions about this approach:
>
> Sure, Dave answered some of this in a different post.
>
> > 1) Are you rendering just the UK?
>
> Nope, I render the Netherlands, some other parts of Europe and parts
> of the US too.
>
> > 2) How long does the rendering take and what spec machine is doing the
> > rendering?
> > 3) How much disk space do the rendered tiles take up?
>
> This week, only 9.5 hours on a modest athlon64 3400+ to render 518,000
> tiles (3.4 Gb).
>
> It takes only a couple of minutes (if that) to render a large town to
> reasonably high zoom levels - mapnik is really, really fast at doing
> this.
>
> > 4) What are you using to drive Mapnik to do the rendering?  Does this
> > automagically create the correct directory hierarchy?
>
> A modified version of generate_tiles.py from
> http://svn.openstreetmap.org/applications/rendering/mapnik/generate_tiles.py
> - yep, it creates tiles in the right hierarchy.


You can further improve performance by using 'color255' utility (JonB)
from svn.openstreetmap.org instead of 'convert'.
Cheers
Artem


>
> Cheers,
>
> Andy
>
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