#2750: LZ4 when writing raster rows; better than double I/O bound r.mapcalc
speed
--------------------------+---------------------------
Reporter: sprice | Owner: grass-dev@…
Type: enhancement | Status: new
Priority: normal | Milestone: 7.2.0
Component: Raster | Version: svn-trunk
Resolution: | Keywords: ZLIB LZ4 ZSTD
CPU: OSX/Intel | Platform: MacOSX
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Comment (by neteler):
For the record - concerning NULL file compression:
At time `cell_misc/null` is uncompressed by default.
Using the environment variable `GRASS_COMPRESS_NULLS=1` NULL compression
is activated for the session for newly created raster maps; and
{{{
export GRASS_COMPRESS_NULLS=1
r.null -z raster_map
}}}
generates a new compressed file `cell_misc/nullcmpr` and removes the old
uncompressed `cell_misc/null` file for existing maps.
Note: At least GRASS GIS 7.2 is needed to read a raster map with
compressed null file.
--
Ticket URL: <https://trac.osgeo.org/grass/ticket/2750#comment:54>
GRASS GIS <https://grass.osgeo.org>
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