[GRASS-dev] [GRASS GIS] #2750: LZ4 when writing raster rows; better than double I/O bound r.mapcalc speed

[GRASS GIS]

#2750: LZ4 when writing raster rows; better than double I/O bound r.mapcalc speed
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  Reporter:  sprice       |      Owner:  grass-dev@…
      Type:  enhancement  |     Status:  new
  Priority:  normal       |  Milestone:  7.1.0
 Component:  Raster       |    Version:  svn-trunk
Resolution:               |   Keywords:  ZLIB LZ4 ZSTD
       CPU:  OSX/Intel    |   Platform:  MacOSX
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Comment (by neteler):

 Replying to [comment:32 sprice]:
 > Hey all, just checking in. What is remaining to get this pushed to the
 GRASS v7.1 code?


 For me two things are yet open.

 First:

 Replying to [comment:30 neteler]:
 > "User" comment: I would suggest to always activate the NULL file
 compression by default, anything else would be confusing.

 --> not yet reflected in the patch (so, the meaning of the var
 `GRASS_COMPRESS_NULLS` should be inverted or, better, implemented as
 `GRASS_NOCOMPRESS_NULLS=1`. I have terabytes of uncompressed NULL files at
 time and would like to get rid of wasting too much disk space.

 Second:

 We need a patch for GRASS GIS 7.0 for backward compatibility, at least for
 the NULL file compression. Which leads to the suggestion that either RLE
 or BZIP should be used here since these two compressors are already
 present in releasebranch70.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2750#comment:33>
GRASS GIS <https://grass.osgeo.org>