[GRASS-dev] [GRASS GIS] #2764: corrupt data written to FCELL and DCELL rasters, hard to re-produce

[GRASS GIS]

#2764: corrupt data written to FCELL and DCELL rasters, hard to re-produce
---------------------+-------------------------
  Reporter:  dylan   |      Owner:  grass-dev@…
      Type:  defect  |     Status:  new
  Priority:  normal  |  Milestone:  7.2.3
 Component:  Raster  |    Version:  unspecified
Resolution:          |   Keywords:
       CPU:  x86-64  |   Platform:  Linux
---------------------+-------------------------

Comment (by dylan):

 After applying the patch, I see this (more informative) error message:

 {{{
 Decompression failed with error 0
 }}}

 This was in the context of a corrupt (?) map generated by r.horizon, when
 run in parallel like this:

 {{{
 seq 0 $step 330 | parallel --gnu --progress "bash make-hz-maps.sh {} $step
 $elev"
 }}}

 make-hz-makes.sh is a simple wrapper around r.horizon:

 {{{
 # start angle
 start=$1
 # angle step size
 step=$2
 # elevation map
 map=$3

 # r.horizon requires start, step, and end angles
 # compute end angle via bc
 end=`echo "$start + $step" | bc`

 r.horizon --q --o elevation=$map step=$step start=$start end=$end
 output=hzangle
 }}}

 Am I abusing GRASS raster libraries by invocation of multiple instances of
 the same module that all access the same elevation map?

--
Ticket URL: <https://trac.osgeo.org/grass/ticket/2764#comment:9>
GRASS GIS <https://grass.osgeo.org>