[Gdal-dev] ECW compression - Extremely slow Linux performance

Andrew Larcombe andrew at andrewlarcombe.co.uk
Fri Aug 18 11:56:18 EDT 2006


I'm using gdal_translate to convert a 4000px x 4000px uncompressed 46MB 
tiff to an ECW file.

On a Windows XP laptop (Pentium M 1.6 GHz, 512MB RAM) using the latest 
fwtools download the process takes about 6 seconds.

On a RedHat Enterprise 3 powered Quad-3.8Ghz processor with 2GB ram 
using gdal-1.3.1 built from source the process takes ~120 seconds.

In each case the command used is as follows:

gdal_translate -of ECW -co "TARGET=90" OSIM_TQ3517_2004-07-07.tif test.ecw

Does anyone have any thoughts on why their is such a considerable 
difference in speed, and what I can do to remedy the situation?



Andrew Larcombe
andrew at andrewlarcombe.co.uk

More information about the Gdal-dev mailing list