[gdal-dev] Memory increase in postgis raster driver

[Even Rouault]

Le mercredi 20 juillet 2016 12:12:59, jramm a écrit :
> 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?

It should remain in the blocks managed by the global raster block cache. 
Playing with GDAL_CACHEMAX when doing gdalinfo -checksum, I see it is honoured 
(the top memory consumption of the process lowers when GDAL_CACHEMAX lowers). 
valgrind does not show memleaks either.

> 
> I'm just stabbing in the dark here as I can't really find a reason for it
> yet
> 
> 
> 
> --
> View this message in context:
> http://osgeo-org.1560.x6.nabble.com/Memory-increase-in-postgis-raster-driv
> er-tp5277284.html Sent from the GDAL - Dev mailing list archive at
> Nabble.com.
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev

-- 
Spatialys - Geospatial professional services
http://www.spatialys.com