[GRASS-user] r.watershed crashing grass.

[Markus Metz]

Milton Cezar Ribeiro wrote:
> Hi Markus,
>  
> Thanks for the tips. In fact I made a mistake, because I thought that 
> with "-m 4096" I was setting 4GB of memory, and unfortunatelly I not 
> payed attention on memory=4096. Anyway, I tryed with both your 
> suggestions (with and without -m memory=4096" and still ger error:
> -----------
> GRASS 6.4.0svn (newLocation):c:/Users/famiglia > r.watershed.exe -m 
> memory=4096 elevation=FabioASTGTM_S2526W049
> 48_dem stream=FabioASTGTM_S2526W04948_dem_rwatershed_stream_thres0100 
> threshold=100 --o --v
> SECTION 1 beginning: Initiating Variables. 5 sections total.
> ERROR: G_malloc: unable to allocate 800000 bytes at setup.c:64
Very very strange. Not even 781 KB of memory left? I don't know Vista 
very well, but I guess there is some sort of task manager where you can 
watch memory consumption. What does it say, is there still enough free 
memory available? Anyway, r.watershed should go into swap space (virtual 
memory) if there is not enough RAM free.

Can you do any other operations on the DEM and the given region, e.g. 
resampling or neighborhood filter or something like that?

Maybe there is a problem with your compilation of grass6.4.0.svn? Is 
everything compiled with msys? There were quite a few posts in the list 
about vista problems, maybe you find some hints there. I'm only using 
Linux, can't help there.

Markus

> WARNING: Subprocess failed with exit code 1
> WARNING: category information for
>          [FabioASTGTM_S2526W04948_dem_rwatershed_stream_thres0100] in
>          [PERMANENT] missing or invalid
> ---------
> Any other suggestions?
>  
> milton
>  
> 2009/7/25 Markus Metz <markus.metz.giswork at googlemail.com 
> <mailto:markus.metz.giswork at googlemail.com>>
>
>     Try to run it all in memory:
>     r.watershed.exe elevation=FabioASTGTM_S2526W04948_dem
>     stream=FabioASTGTM_S2526W04948_dem_rwatershed_stream_thres0100
>     threshold=100 --o
>
>     Should finish in a few minutes.
>
>     Where is this 4096 coming from in the original command? Should
>     that be memory=4096?
>     r.watershed.exe -m memory=4096
>     elevation=FabioASTGTM_S2526W04948_dem
>     stream=FabioASTGTM_S2526W04948_dem_rwatershed_stream_thres0100
>     threshold=100 --o
>
>     How far did it get? There are usually message like SECTION 1:,
>     SECTION 2:, SECTION 3: etc.
>
>     Markus M
>
>
>
>     Milton Cezar Ribeiro wrote:
>
>         Dear all,
>          I am trying run a r.watershed command with one 7200x7200 DEM map.
>         But after one day running, the system crash without finish the
>         output generation.
>         Please, see below (2 warnings before crash).
>         By the way I am running grass 6.4.0 SVN (rc4?) under Msys/Vista
>         on a 6Gb/64 bits machine.
>          Thanks for the help,
>          milton
>         ===
>         GRASS 6.4.0svn (newLocation):c:/Users/famiglia > g.region -p
>         projection: 0 (x,y)
>         zone:       0
>         north:      -23.99986111
>         south:      -26.00013889
>         west:       -49.00013889
>         east:       -46.99986111
>         nsres:      0.00027778
>         ewres:      0.00027778
>         rows:       7201
>         cols:       7201
>         cells:      51854401
>           GRASS 6.4.0svn > g.region rast=FabioASTGTM_S2526W04948_dem
>         GRASS 6.4.0svn > r.watershed.exe -m 4096
>         elevation=FabioASTGTM_S2526W04948_dem
>         stream=FabioASTGTM_S2526W04948_dem_rwatershed_stream_thres0100
>         threshold=100 --o
>          WARNING: Subprocess failed with exit code 255
>         WARNING: category information for
>                
>         [FabioASTGTM_S2526W04948_dem_rwatershed_stream_thres0100] in
>                 [PERMANENT] missing or invalid
>
>
>