[gdal-dev] RE: Memory Error in _gdal.Band_ReadRaster(*args,
gregcoats at mac.com
Sun Aug 16 21:19:48 EDT 2009
You said you have 8 GB RAM, and gdal_translate was using only 2 GB
RAM, and your specific question was "Do I need to set some settings
to speed things up?". Yes, you should increase the amount of RAM
gdal_translate makes available to GDAL_CACHEMAX. For example,
"gdal_translate --config GDAL_CACHEMAX 4000 " followed by the rest of
the gdal_translate command. In your message you have "--config
GDAL_CACHEMAX 4000-v", but there needs to be a space after "4000" and
I have successfully used gdal_merge.py and gdal_translate to create
GeoTIFF files as large as 142 GB, under Unix based Mac OS X, on a
computer with only 3 GB RAM.
On Aug 16, 2009, at 4:00 PM, Paul Meems wrote:
> Thanks Greg for your help about speeding things up.
> But speed is the least of my problems.
> I wouldn't mind waiting 72 hours if it gets the job done.
> But even with this statement:
> gdal_retile --config GDAL_CACHEMAX 4000-v -s_srs EPSG:28992 -of ECW
> -ps 17335 16000 -targetDir tiles large.ecw
> I get the Memory error.
> Do you also have any suggestion on that. Would be very much
> 2009/8/14 Greg Coats <gregcoats at mac.com>
> It is my understanding that the default is
> gdal_translate --config GDAL_CACHEMAX 40 ...
> which equates to 40 MB of memory.
> If you want to allow gdal_translate to use say 2 GB of memory for
> GDAL_CACHEMAX, enter
> gdal_translate --config GDAL_CACHEMAX 2000 ...
> In my experience, increasing GDAL_CACHEMAX substantially speeds up
> gdal_translate processing.
> On Aug 14, 2009, at 4:08 PM, Paul Meems wrote:
> I also noticed both gdal_translate and gdal_retile not use the full
> potential of my hardware. I'm running Vista 64Bit on a AMD3 2.6Ghz
> quadcore with 8GB RAM and only 2-2.5GB RAM was used by
> gdal_translate, leaving more than 5 GB free and only 35-55% of my
> CPU was used. Do I need to set some settings to speed things up?
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