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List: grass-dev
Subject: [GRASS-dev] [GRASS GIS] #2356: r.stream.basisns uses more memory than given in memory option
From: "GRASS GIS" <trac () osgeo ! org>
Date: 2014-06-30 5:43:46
Message-ID: 037.f60470b1f3383927f8266ede7cba686b () osgeo ! org
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#2356: r.stream.basisns uses more memory than given in memory option
--------------------------------------+-------------------------------------
Reporter: sbl | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone: 7.1.0
Component: Raster | Version: svn-trunk
Keywords: r.stream.basisns, memory | Platform: Linux
Cpu: x86-64 |
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I tried to run r.stream.basins on using large flow direction / stream maps
generated with r.watershed.
With m-flag and memory option set to 35GB (~2/3 of the RAM of my system)
the process got killed (by out-of-mmemory-killer) after input maps were
read.
So, I re-ran the module with a smaller amount of memory allocated (20 and
10 GB) in the memory option and monitored memory usage (UNIX top command).
There I found that r.stream.basisns used 2x the amount of RAM allowed, on
each input map. In other words, with memory=10000, it used
20GB for reading flow direction map, plus
20GB for reading streams map (40GB in total).
Finally, the process gets killed when it starts finding nodes.
I am using Ubuntu 12.04 LTS 64bit and GRASS 7.0 (revision 58620).
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/2356>
GRASS GIS <http://grass.osgeo.org>
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