Re: [gdal-dev] Python WriteArray()

2011-07-14 Thread Even Rouault
Selon "Jay L." : It is always difficult to diagnose performance issues at distance, but an explanation could be that you hit cache trashing when alternating read and writes. Whereas when you read several blocks and write them afterwards, you can benefit from the read cached blocks. You could try i

[gdal-dev] Python WriteArray()

2011-07-13 Thread Jay L.
I am working on processing some raster images and have been really struggling with processing times. I have tracked the issue down to GDAL's WriteArray() function. I am cutting the image into blocks and processing in small chunks. This is facilitate working with really large images where the ent