[Tilecache] how to speed up tilecache seeding in Tilecache_seed.py

[Guillaume Sueur]

Hi,

Also, please note that even when using Metatiling tilecache_seed stille 
counts how many tiles it has to generate, without indicating how many 
base tiles it corresponds to. What you can see in the tilecache_seed 
ouuput is that the total amount of tiles to generate is drastically 
lower than without metatile.
But be sure tilecache_seed takes metatiling in consideration, cause it 
*does* !

regards

Guillaume

Alireza Kashian a écrit :
> Hi fredj
> 
> Yes. I have done exactly same as you say.
> 
> But are you using tilecache_seed.py code to seed? if yes, look at the 
> output screen, you see that tiles are generated one by one..
> in my case, each tile takes 1 second to generate and we have like 40 
> layers in our map file..so I know it needs high computing power to send 
> each request seperately to tilecache...I was hoping that 
> tilecache_seed.py could jump another 11 tiles and request like 1 - 12 - 
> 23 - 34 - 45 ....
> because when it calls for 1, it generate all 121 tiles around it...when 
> it calls 12, it generate all tiles around 12...and so on..
> so it doesn not need to call for: 1-2,3,4,5,6,7,8..........
> 
> thanks
> Alireza
> On Wed, Jun 3, 2009 at 7:29 PM, Frederic Junod 
> <frederic.junod at camptocamp.com <mailto:frederic.junod at camptocamp.com>> 
> wrote:
> 
>     Hi,
> 
>     The meta tiling system works for me with the trunk version [1].
>     Make sure you have the:
>      metaTile=true
>      metaSize=11,11
>     in your layers options.
>     Meta tiling is off by default even if you have a metaSize.
> 
>     Regards,
>     fredj
> 
> 
>     PS: lucky you; I have more that 9'000'000 tiles in my last level :-)
> 
>     [1] http://svn.tilecache.org/trunk/tilecache
> 
>     On Wed, Jun 3, 2009 at 3:58 PM, Alireza Kashian
>     <alireza.kashian at gmail.com <mailto:alireza.kashian at gmail.com>> wrote:
>      > Hi.
>      > I would like to know how we can making tiles faster in
>     tilecache_seed.py
>      >
>      > The issue is that tilecache_seed.py tries to make tiles ONE by ONE..
>      > so for example, in our case, in last zoom levels we have 300,000
>     tiles and
>      > each tile is generate in 1 second because our Map File is very
>     complex and
>      > parsing and making queries to PostGIS takes time.
>      >
>      > Actually MetaTiling is a very good solution, but the problem is
>     that I feel
>      > Tilecache_seed.py does its job without attention to Meta Tiling..for
>      > example, our MetaTile is 11x11...so 121 Tiles are geneated in
>     like 3-4
>      > seconds...but When I run Tilecache_seed.py . I see from the log
>     that it
>      > makes tile requests one by one which takes like 300,000 seconds
>     for just one
>      > of our zoom levels..
>      > Our map file is large , it is like 400 Kbyte..so I feel how hard
>     it is to
>      > make queries 300,000 times for making 300,000 tiles :)
>      >
>      > How can we help Tilecache_seed.py to benefit from MetaTile config in
>      > Tilecache.cfg.
>      >
>      > Thanks
>      > Alireza
>      >
>      >
>      > _______________________________________________
>      > Tilecache mailing list
>      > Tilecache at openlayers.org <mailto:Tilecache at openlayers.org>
>      > http://openlayers.org/mailman/listinfo/tilecache
>      >
>      >
> 
> 
> 
>     --
>     Frédéric Junod
>     Camptocamp SA
> 
> 
> 
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