[OSM-talk] A Swedish national server for OSM

Karl Newman siliconfiend at gmail.com
Tue Jul 29 23:00:15 BST 2008


On Tue, Jul 29, 2008 at 2:16 PM, Dave Stubbs <osm.list at randomjunk.co.uk>wrote:

> On Tue, Jul 29, 2008 at 7:57 PM, Inge Wallin <inge at lysator.liu.se> wrote:
> > In the rather large thread "Actually using OpenStreetMap and the
> usability of
> > the current maps" I got to understand a few things that I didn't grasp
> > before.
> >
> > So to make a long story short, I have decided to check the viability of
> > setting up a Swedish tile server + slippy map and some other services. To
> do
> > that I am applying for some money from the Swedish Internet Society that
> has
> > grants for such things.
> >
> > But to be able to write the application, I need to understand the size of
> the
> > task.  Things like:
> >  - How long does it take to render a typical tile set? Will a single
> machine
> > be able to render all the tiles for Sweden, for instance? What's the size
> of
> > the current render farm for the mapnik map on openstreetmap.org?
> >
> >  - How much bandwidth will it use?
> >
> >  - How difficult is it to set up a working server? I'm fairly skilled in
> > deployment, but I have never worked with mapnik, nor osmarender or
> > slippymaps.
> >
> > I am aware that the questions are fuzzy, but all data will be much
> > appriciated.
> >
>
> For the cyclemap we prerender the tiles and upload them to a cheap
> "dumb" webhost. The coverage of the cyclemap is quite large, but
> typically only goes as far down as zoom 13 (or zoom 14 for the UK), we
> do selected cities at higher zoom.
>
> We render on a box with the cheapest quad core processor available
> (Core2 Q6600), and 8GB RAM -- this does approximately 1 million tiles
> in about 5 hours (and includes contours -- the standard rendering is
> 2-3 times faster to render). Our main bottleneck is then uploading
> these tiles to the webhost.
>
> In July the cyclemap used approximately 200GB of bandwidth serving
> tiles -- but it is quite popular and the tile sizes are actually quite
> large...
>
> In terms of setup, if you're doing an on-demand modtile solution, then
> it relatively easy.. just follow the instructions on the wiki -- give
> it a try on a VM first to test out the process on the distro that you
> want to use. Relative is obviously relative... but it's easier than
> MythTV
>
> Dave
>

What's hard about "emerge mythtv"? Unless you want a remote control (lirc),
and a LCD display (LCDproc), and RAID (mdadm) and LVM... Oh, I guess it was
a bit of a pain. ;-)

Karl
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