Hi,
I'm an absolute newby with mapnik, but this is just about computing
exponential costs.
Suppose you have japan in 1 tile, and you like to render 10 levels of
zoom. And hen you zoom each tile it generates 4 tiles, so:
1 + 4 + 16 + 64 + 256 + 1024 + 4096 ....
4¹+ 4²+4³+4⁴ ....
so for level 10 you have to render 4¹⁰ tiles = 1048576
if one tile takes just one second to render you will need 1048576
seconds to render just level 10, this are 291 hours or 12 days.
This is just an example, i do not know exactly if when zooming one tile
explode to four, but the computing cost is 100% exponential.
Salut!
Jaume.
On 11/18/2010 03:53 AM, Jin Kang wrote:
Hi Kenneth,
Thanks for the quick feedback! We will look into this as you suggested.
Kind regards,
J
On Nov 18, 2010, at 11:43 AM, Kenneth Gonsalves wrote:
On Thu, 2010-11-18 at 11:07 +0900, Jin Kang wrote:
We are currently rendering OSM using mapnik in Window platform with
reasonable spec of h/w (2.6G CPU and 3G RAM). We just want to know
usually how long does it takes to render OSM map. Currently we are
trying to render Japanese map but seems like it is running more than 1
weeks and still running. Your comments will be very helpful. Thanks in
advance!
how are you rendering? are you using mod_tile - if not it may take
forever (I remember trying to render just India on my VPS and it was
still running after 10 days)
--
regards
Kenneth Gonsalves
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