[GRASS-user] r.watershed G_malloc error

GRASS GRASS user
1

Hi All,

I’m on windows xp using GRASS 6.4 and 7 and I’m getting the following error running r.watershed:

ERROR: G_malloc: unable to allocate 2521456396 bytes of memory at init_vars.c:137

I’ve 2Gb of ram and the dtm I’m using is 185Mb in (pre import) ascii grid format, so not massive. Is the above error because I’m short on ram for the above process, or is it something else?

Cheers,
Michael

2

On Wed, Apr 13, 2011 at 3:37 PM, Michael Spencer
<michael_spencer@live.co.uk> wrote:

Hi All,

I'm on windows xp using GRASS 6.4 and 7 and I'm getting the following error
running r.watershed:

ERROR: G_malloc: unable to allocate 2521456396 bytes of memory at
init_vars.c:137

I've 2Gb of ram and the dtm I'm using is 185Mb in (pre import) ascii grid
format, so not massive. Is the above error because I'm short on ram for the
above process, or is it something else?

1. make sure the current region settings are ok, i.e. not extending
beyond the extents of the dtm and aligned to the dtm (g.region
align=dtm)

2. use the disk swap mode with r.watershed -m

Markus M

3

Thanks Mark, and others.

I found a pc with a bit more ram, reduced the region to the dtm and it was fine.

Cheers,
Michael

Date: Wed, 13 Apr 2011 16:12:22 +0200
Subject: Re: [GRASS-user] r.watershed G_malloc error
From: markus.metz.giswork@googlemail.com
To: michael_spencer@live.co.uk
CC: grass-user@lists.osgeo.org

On Wed, Apr 13, 2011 at 3:37 PM, Michael Spencer
michael_spencer@live.co.uk wrote:

Hi All,

I’m on windows xp using GRASS 6.4 and 7 and I’m getting the following error
running r.watershed:

ERROR: G_malloc: unable to allocate 2521456396 bytes of memory at
init_vars.c:137

I’ve 2Gb of ram and the dtm I’m using is 185Mb in (pre import) ascii grid
format, so not massive. Is the above error because I’m short on ram for the
above process, or is it something else?

  1. make sure the current region settings are ok, i.e. not extending
    beyond the extents of the dtm and aligned to the dtm (g.region
    align=dtm)

  2. use the disk swap mode with r.watershed -m

Markus M