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

[GRASS GIS]

#2045: r.to.vect: use less memory
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  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
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Comment (by mlennert):

 Replying to [comment:20 mmetz]:
 > Replying to [comment:19 mlennert]:
 > >
 > > Data and info provided via private mail.
 >
 > I have received the data, thanks!
 >
 > >
 > > Previous posters have also reported that setting GRASS_VECTOR_LOWMEM
 didn't make much of a difference, so maybe the problem is there ?
 >
 > I don't think so. Without GRASS_VECTOR_LOWMEM, v.build needs about 26 GB
 of RAM. With GRASS_VECTOR_LOWMEM, v.build needs about 11 GB of RAM but is
 about 4.5 times slower, that is expected because some temporary data are
 kept on disk and not in memory.

 Why does it still need 11GB of RAM when working with disk-based data ? Is
 this really unavoidable ?

 GRASS has always had a tradition of allowing to work on limited resources.
 Even though RAM is cheap, I would still consider > 11GB as rather high-end
 in many offices. I wouldn't mind if it makes the command much slower, but
 it would be nice if it could get the job done with less RAM usage...

 But I have nothing to propose, so I'll leave it at that.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2045#comment:21>
GRASS GIS <https://grass.osgeo.org>