[GRASS-user] r.watershed crashing grass.

[Milton Cezar Ribeiro]

Hi Markus,

My system start with 1.5GB of memory usage, considering that
grass are loaded on memory, and my mapset is also loaded.
When I start the r.watershed, my system go up to 3.0GB, remain
running for few minutes, and then give the error that I reported,
and them release the memory. On several trying the system
goes only up to 3GB, but I have 6Gb. So my "-m memory=4096"
not make sense. In fact 3-1.5 = ~ 1.5GB as you suggested.

Any other idea?

cheers

milton

2009/7/25 Markus Metz <markus.metz.giswork at googlemail.com>

>
> 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
>>
>>
>>
>>
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