[GRASS-user] g_malloc on r.watershed with 30GB free ram + r.fill.dir crash

mael mael.moreni at onf.fr
Thu Sep 10 12:00:33 PDT 2015

I am working on a 13407 lines * 11050 columns, 565 MB, raster file (SRTM DEM,
30m) with a script that calls a series of hydrological modules in GRASS
The system I am using is a Windows server 2012 R2, 64 bit Intel Xeon 2.5 GHz
processor, 32GB of RAM.

The first module called in the script is r.watershed. When lunched on that
data set, it generates the following error : G_malloc: impossible to
allocate 1185910608 bytes to raster/r.watershed/ram/init_vars.c:149
It apears to be running out of memory even though there is a lot more
available than what it's asking for.

I managed to pass that first hurdle using the -m flag on r.watershed. The
scripts now requires 7 GB of disk space; even if it's slow and I don't
understand why it can't use the ram in the first place, r.watershed finishes

However, when the script gets to the next module, r.fill.dir, GRASS crashes
at 'Reading input elevation raster map...' with the following message:

Problem signature: Problem Event Name: APPCRASH Application Name:
r.fill.dir.EXE Application Version: Application Timestamp: 54e7aaf0
Fault Module Name: r.fill.dir.EXE Fault Module Version: Fault Module
Timestamp: 54e7aaf0 Exception Code: c00000fd Exception Offset: 00001479 OS
Version: 6.3.9600. Locale ID: 1036 Additional Information 1: 3397
Additional Information 2: 33978ebc9cf04f9490066e458551979d Additional
Information 3: caf7 Additional Information 4:

The script runs fine on a smaller data set.

Any idea how to stop the module from crashing?

Is there a way to use make sure it uses the ram instead of the disk?

Thank you

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