1 - Find a faster CPU machine with 16Gb RAM and a SSD for a start, it will be better, Also if you have the opportunity check that the RAM is a 1800MHz one, details like this may actually add your computation performance.
2 - Cut in pieces (See Markus Comment about supercomputing) and run 4 quads on 4 CPUs instead of one large image in one CPU. 3 - Recode i.segment to work natively on heterogeneous computers... (would be fun!) Good luck! On 4 July 2013 14:10, Moritz Lennert <mlenn...@club.worldonline.be> wrote: > Hello, > > In parallel to the discussion going on in another thread, I have a question > concering the segmentation of another Worldview 2 scene: > > I first used all 8 multispectral bands and managed to get a series of > results with increasing thresholds in very reasonable running times. The > region was as follows: > >> g.region -p > projection: 1 (UTM) > zone: -36 > datum: wgs84 > ellipsoid: wgs84 > north: 7251172 > south: 7234772 > west: 333792 > east: 350192 > nsres: 2 > ewres: 2 > rows: 8200 > cols: 8200 > cells: 67240000 > > and the command line: > > i.segment group=xs out=seg_xs minsize=2 memory=3072 threshold=0.05 (and > thresh=0.1 and 0.2 in successive runs using the results of the previous run > as seeds). > > Now, I would like to test segmentation of just the panchromatic band. This > means the following region settings: > > projection: 1 (UTM) > zone: -36 > datum: wgs84 > ellipsoid: wgs84 > north: 7251172 > south: 7234772 > west: 333792 > east: 350192 > nsres: 0.5 > ewres: 0.5 > rows: 32800 > cols: 32800 > cells: 1075840000 > > Trying to run with the following command line on my i3, 8GB RAM machine: > > i.segment group=pan out=seg_pan_005 threshold=0.05 memory=3072 > > had the process running for almost 13 hours with it then becoming apparently > stuck in the fourth pass at 10%. At that point the percent didn't change for > over an hour, so I decided to kill the process. Can I assume that I'm here > above the capacities of my machine ? Is there anything (besides working on a > smaller subsample of the image) that I can do to make it work ? What kind of > resources would I need to be able to run such a segmentation? > > I guess I'll have to move these kinds of treatments to our university > supercomputer, but I first have to get them to install GRASS... > > Moritz > _______________________________________________ > grass-dev mailing list > grass-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-dev -- ---- _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev
