[GRASS-dev] [GRASS GIS] #2045: r.to.vect: use less memory

[GRASS GIS]

#2045: r.to.vect: use less memory
--------------------------+-------------------------
  Reporter:  mlennert     |      Owner:  grass-dev@…
      Type:  enhancement  |     Status:  new
  Priority:  normal       |  Milestone:  7.0.5
 Component:  Raster       |    Version:  svn-trunk
Resolution:               |   Keywords:  r.to.vect
       CPU:  Unspecified  |   Platform:  Unspecified
--------------------------+-------------------------

Comment (by mmetz):

 Replying to [comment:16 mlennert]:
 > Replying to [comment:15 mlennert]:
 > >
 > > I did use GRASS_VECTOR_LOWMEM=1, but the process was stopped. No
 explicit memory error, but AFAIK  such stopping of a process happens in
 case of memory errors:
 > >
 > >
 > > {{{
 > > Enregistrement des primitives ...
 > > 63282475 primitives registered
 > > 397657832 vertices registered
 > > Construction des surfaces ...
 > > Processus arrêté
 > >
 > > real    106m12.306s
 > > user    28m2.664s
 > > sys     68m42.260s
 > > }}}
 > >
 > > Next try will be to use v.build on the vector created by r.to.vect
 -b...
 >
 >
 >
 > {{{
 > > export GRASS_VECTOR_LOWMEM=1
 > > time v.build seg_full
 > Construction de la topologie pour la carte vectorielle
 > <seg_full at rtovecttest>...
 > Enregistrement des primitives ...
 > 63282475 primitives registered
 > 397657832 vertices registered
 > Construction des surfaces ...
 > Processus arrêté
 >
 > real    84m57.309s
 > user    19m8.872s
 > sys     54m37.868s
 > }}}

 Strange. Topology building should be much slower with GRASS_VECTOR_LOWMEM,
 therefore I would expect v.build with GRASS_VECTOR_LOWMEM to fail later,
 not earlier. Can you provide data and commands for testing?
 >
 > :-(
 >
 > I, therefore, do not have any means to vectorize this file directly in
 one piece on my computer. Memory usage goes up steadily through v.build.
 >
 > I'll try r.to.vect.tiled.

 This should also fail if you want r.to.vect.tiled to patch the tiles
 together.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2045#comment:18>
GRASS GIS <https://grass.osgeo.org>