[gdal-dev] Memory increase in postgis raster driver

[jramm]

I am seeing a continuous, linear memory increase when reading sequential
windows of a large postgis dataset. This is the same regardless of my
GDAL_CACHEMAX settings
If I run he same code on an equivalent GTiff dataset, I do not see the same
increase in memory. 

I can see that the postgis dataset RasterIO implementation calls CacheTile
for each tile it reads, which I think uses the GDAL caching mechanism - is
it possible that, since each tile will be *new* (due to the sequential read
over the dataset), it is somehow cached outside of the gdal cache/ignoring
the CACHEMAX setting?

I'm just stabbing in the dark here as I can't really find a reason for it
yet



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