[Tilecache] Re: MetaTiling - does projection affect?

[Guillaume Sueur]

Hi Bill,

The behaviour is exactly as expected here. Metatiling in mainly designed 
to seed your cache quicker, because rendering a 2560 x 2560 image and 
splitting it into 100 pieces is much faster than rendering 100 tiles. 
But it is clearly not designed to be used in a "production" context. The 
number of request sent by the client is the same (because the client 
doesn't know about metatiling), but for each tile of 256x256 which 
doesn't exist in the cache you will generate 100 tiles on the server.
My advice : keep the metatile on for seeding the cache (with 
tilecache_seed.py), and put it off when publishing the cache throught 
Apache. It can also drive you to file locking and other problems.

Regards,

Guillaume

Le 06/05/2010 06:54, Bill Teluk a écrit :
>
> Correction to item posted to mailing list:
> metaTile "off"
> 184 WMS requests with 184 tileimages found in the cache
> metaTile=true
> 184 WMS requests and 316 tile images
> (I assume it should be same number of tile images in both cases, but less
> WMS requests?)