[mapguide-users] Idea for making MgCooker faster

[Kenneth Skovhede, GEOGRAF A/S]

I can understand your motivation for wanting to make the tiles bigger.
You can set the tile size using the command line options
--tilewidth=512 --tileheight=512

The problem with creating different size tiles, is that the number 
system gets altered,
so you have to re-enumerate all the files to match the expected numbers.

If such a number matching system is produced (not too difficult),
you would need access to the filesystem to rename the files.

If you manage to get something working, I would be happy to
include it in MgCooker.

It would have to be an option, as MgCooker is capable of running
with only http access, and I would like to retain that possibility.

Regards, Kenneth Skovhede, GEOGRAF A/S



Bruno Scott skrev:
> Motivation:
> We are using tiling, with the little patch we made for httptiling
> Displaying is incredely fast, and it is using the client browser cache.
> The real problem now is to pre generate all tiles.
> For scale 1000 there is 3425920 256x256 tiles
> With the previous MgCooker(3706) we had a average of 3 tile / sec so 13 days
> for processing a single scale
> With MgCooker(3911) using 2 simultaneous process is almost twice as fast so
> we are aroud 7 days
> We have 15 scales to process 
> We have to refresh the tiles every 30 days.
> Full processing is still more than 30 days.
>
> Here an idea, why not try to make Mapguide generate bigger tiles and split
> them in a post process
> Here is some interesting bench we made using the old 3706 mgcooker (single
> process)
>
> 1024x1024 Tiles:
>     32h for 214120 tiles 
>     1.85 tiles(1024)/sec ~=  29.6 tiles(256)/sec 
>  
> 2048x2048 Tiles:
>     18h30 for 54180 tiles
>     0.81 tiles(2048) /sec ~= 52 tiles(256) /sec 
>  
> 3072x3072 Tiles:
>     14h50 for 24192 tuiles
>     0.45 tiles(3072) /sec ~= 65 tiles(256) /sec 
>
> I've made a little aspx program using GD to bench tile splitting
>   Splitting a 1024x1024 tile : 0.218 sec
>        0.0136 sec per 256x256 tile
>
>   Splitting a 2048 x2048  tile : 0.691 sec
>        0.0108 sec per 256x256 tile
>
>   Splitting a 3072x3072  tile : 1.804 sec
>        0.0125 sec per 256x256 tile
>   So it's around 4 days of post process, i'm trying to make it faster
>
> Bruno
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