On 5/11/2012 4:55 PM, Gregory, Matthew wrote:
Hi all,
Probably a newbie question. I'm trying to investigate some read rates without
the benefit of caching from Python. When I do this:
from osgeo import gdal
gdal.SetCacheMax(0)
print gdal.GetCacheMax()
I always get the environment variable value GDAL_CACHE_MAX instead of 0.
Throughout my test script, I can also query gdal.GetCacheUsed() and it
increases toward GDAL_CACHE_MAX. Am I totally misunderstanding their use? I'm
on Windows 7 64-bit, GDAL version 1.7.
A bit more experimentation led to this:
>>> from osgeo import gdal
>>> print gdal.GetCacheMax()
786432000
>>> gdal.SetCacheMax(0)
>>> print gdal.GetCacheMax()
0
So, for some reason a call to GetCacheMax has to occur before
SetCacheMax can be used? This seems to be working in my testing script.
matt
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