[GRASS-dev] r.fill.dir segfaults on large maps.

GRASS GIS GRASS GIS developer
1

Hi all,

I’m using r.fill.dir on a very large landscape, and noticed that it will segfault if the number of cells is > 150,000,000. Is this a known limitation of r.fill.dir, or a bug? Happy to report the bug if so. I’m using latest nightly of GRASS 7 on Ubuntu 14.04.

···

Isaac I Ullah, Ph.D.

Arizona State University
School of Human Evolution and Social Change
PO Box 2402
Tempe, AZ 85287-2402
(480) 727-1054 office
(650) 201-0479 cell
iullah@asu.edu

2

On Thu, Feb 11, 2016 at 5:43 PM, Isaac Ullah <isaac.ullah@asu.edu> wrote:

Hi all,

   I'm using r.fill.dir on a very large landscape, and noticed that it
will segfault if the number of cells is > 150,000,000. Is this a known
limitation of r.fill.dir, or a bug? Happy to report the bug if so. I'm
using latest nightly of GRASS 7 on Ubuntu 14.04.

Might be a memory issue. If you don't have enough memory, it would give you
an error that it can't allocate. Is this perhaps the case? If not, then
it's probably a bug.

Anna

--
Isaac I Ullah, Ph.D.

Arizona State University
School of Human Evolution and Social Change
PO Box 2402
Tempe, AZ 85287-2402
(480) 727-1054 office
(650) 201-0479 cell
iullah@asu.edu

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3

Hmmm… I restarted GRASS and I can no longer replicate the problem. It was a very specific cut-off at 150 million cells though. I guess it’s a non-issue since it works now. I monitored the memory usage, and even at 400 million cells, it was only using 52 MB. Strange why it was breaking before! Thanks for your help though.

~Isaac

···

On Thu, Feb 11, 2016 at 4:26 PM, Anna Petrášová <kratochanna@gmail.com> wrote:

–

On Thu, Feb 11, 2016 at 5:43 PM, Isaac Ullah <isaac.ullah@asu.edu> wrote:

Hi all,

I’m using r.fill.dir on a very large landscape, and noticed that it will segfault if the number of cells is > 150,000,000. Is this a known limitation of r.fill.dir, or a bug? Happy to report the bug if so. I’m using latest nightly of GRASS 7 on Ubuntu 14.04.

Might be a memory issue. If you don’t have enough memory, it would give you an error that it can’t allocate. Is this perhaps the case? If not, then it’s probably a bug.

Anna

–

Isaac I Ullah, Ph.D.

Arizona State University
School of Human Evolution and Social Change
PO Box 2402
Tempe, AZ 85287-2402
(480) 727-1054 office
(650) 201-0479 cell
iullah@asu.edu

grass-dev mailing list
grass-dev@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-dev

Isaac I Ullah, Ph.D.

Arizona State University
School of Human Evolution and Social Change
PO Box 2402
Tempe, AZ 85287-2402
(480) 727-1054 office
(650) 201-0479 cell
iullah@asu.edu