[Tilecache] calculate used memory for tilecache_seed

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Hi all,

I have a problem with an exeption by exceution tilecache_seed.
Exception is: 
2008-04-17 13:16:02,121 ERROR [coverage.processing] - Tile cache capacity
exceed maximum heap size (1.290 Mb).

First I think is wow :-0, it used a lot of memory. I've give him per
wrapper.conf 1,3 Gb memory.

I use a image as coverage in GeoServer with 11178 x 14790
and a extend of  bbox=259828, 5230501, 920728, 6084502

Here the tilecache.cfg:

[D1M]
type=WMSLayer
url=http://ip/geoserver/wms?
size=1024,1024
layers=WCS:Deutschland_1Mio.0
extension=png
bbox=259828, 5230501, 920728, 6084502
srs=EPSG:23032
levels=4
resolutions=57.74, 28.87, 14.43, 7.21

Resolutions was calculated by 6084502 - 5230501 / 14790 = 57.74 meter per
pixel by a scale of 1:1Mio
Now it will produce several peaces in 1024 x 1024 with 57.74 meter per
pixel...... and so on all resolutions down. 
I will take the 1:1 presenting with scale 1:1Mio as first Zoomlevel
(zoomlevel==0) tiled in peaces of 1024 X 1024.

But it fails secounds after I started the tilecache_seed with an out of
memory exception.....

Knows anybody why.
If I calculate the memory than I will get:

- The picture is in 4 bpp.

11178 x 14790 = 165322620 bytes in 32 bit mode (*8) = (1322580960 / 1024) /
1024 = 1261,311 mb

It is realy big for working in RAM but I have no choice. I think the given
memory is enough, but my server say no......

Has anybody a idea......,
Realy thanks Klaus
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