Hi Matt,
I don't know all details about TC but it looks like gdal.input is
loading whole image into memory.
Couple things you can try :
1. using tiffcp utility (part of LibTIFF package) 'tile' your tiff.
2. try using raster.input which can load tiffs you just need to
provide bbox.
Let me know if you're still having problems.
Artem
On 25 Nov 2008, at 20:10, Matt Bartolome wrote:
> Ok, I got mapnik to render an image of the geotiff but when I try to
> seed the layer using TileCache it bombs on the first attempt at
> rendering a tile. I'm not sure what the difference would be in doing
> the mapnik hello world example and the way tilecache is doing it
> through tilecache_seed.py. They are almost identical except the bit in
> TileCache's Mapnik.py that return the image data instead of
> render_to_file like I have below. I've tried setting shhmax higher
> than the 32mb default on my system but it still bombs. Ugh.
>
> from mapnik import *
>
> def test_mapnik():
>
> mapfile = 'mapnik-config/62851963.xml'
> map_output = 'hello_world_using_xml_config.png'
> m = Map(600, 600)
> load_map(m, mapfile)
> bbox = Envelope(Coord(6124093,1761898.25),
> Coord(6637898,2175848.75))#san diego county
> m.zoom_to_box(bbox)
> render_to_file(m, map_output)
>
> def test_tilecache():
> from TileCache import Client, Layer
> from TileCache.Service import Service
> service = Service.load("tilecache.cfg")
> Client.seed(service, service.layers["62851963"], levels=(0,14),
> bbox=[6124093,1761898.25,6637898,2175848.75])
>
>
> if __name__ == "__main__":
>
> test_mapnik()
> test_tilecache()
>
>
> My tilecache.cfg is:
>
> [cache]
> base = /mnt/data-store/cache
> type = Disk
>
> [62851963]
> type = Mapnik
> layers = 62851963
> mapfile = mapnik-config/62851963.xml
> srs = EPSG:2230
> debug = false
>
> end of the strace I'm getting:
>
> munmap(0x2aaab92d2000, 4096) = 0
> open("/usr/lib/python2.5/site-packages/TileCache-2.04-py2.5.egg/
> TileCache/Layers/Mapnik.py",
> O_RDONLY) = 3
> write(2, " File \"/usr/lib/python2.5/site-"..., 118 File
> "/usr/lib/python2.5/site-packages/TileCache-2.04-py2.5.egg/TileCache/
> Layers/Mapnik.py",
> line 67, in renderTile
> ) = 118
> fstat(3, {st_mode=S_IFREG|0755, st_size=3268, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> 0) = 0x2aaab92d2000
> read(3, "# BSD Licensed, Copyright (c) 20"..., 4096) = 3268
> write(2, " ", 4 ) = 4
> write(2, "mapnik.render(m, im)\n", 21mapnik.render(m, im)
> ) = 21
> close(3) = 0
> munmap(0x2aaab92d2000, 4096) = 0
> write(2, "MemoryError", 11MemoryError) = 11
> write(2, "\n", 1
> ) = 1
> rt_sigaction(SIGINT, {SIG_DFL}, {0x2aaaaada4ac0, [], SA_RESTORER,
> 0x2aaaab03c540}, 8) = 0
> close(4) = 0
> munmap(0x2aaab92d1000, 4096) = 0
> munmap(0x2aaab765e000, 2268016) = 0
> munmap(0x2aaab7452000, 2144656) = 0
> munmap(0x2aaab7233000, 2223816) = 0
> munmap(0x2aaab7025000, 2153024) = 0
> exit_group(1) = ?
>
>
> -Matt
>
> On Mon, Nov 24, 2008 at 5:52 PM, Matt Bartolome
> <[EMAIL PROTECTED]> wrote:
>> I've built an x64 instance of fedora8 on amazon's EC2 cloud with yum
>> packages and the latest svn version of mapnik. I don't have any
>> issues
>> rendering vector data with the shape or postgis datasources but today
>> ran into a "MemoryError" while rendering a ~290MB GeoTIFF with the
>> gdal datasource.
>>
>> I can render the same geotiff on my 32bit RHEL5 setup without any
>> issues.
>>
>> Any help or info would be much appreciated. I read Dane's messages
>> from a while back about the mr. sid files and the same sort of error
>> but didn't see any solution.
>>
>> Thanks,
>> -Matt
>>
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