[GRASS-user] Can I turn off compression

[Vaclav Petras]

Hi Ken,

That sounds like a good experiment and I think there would be general
interest in what you find. However, please note that less compression may
not mean faster, because then there is more data to write and read and I/O
is generally a significant bottleneck. Markus Metz may say more about this
as he did tests when he was implementing the new compressions, but you
might be able to find some posts on this on the grass-dev mailing list.

Best,
Vaclav

On Sat, Feb 29, 2020 at 11:40 AM Ken Mankoff <mankoff at gmail.com> wrote:

>
> Hm. Answer: No
>
> I just did:
>
> export GRASS_COMPRESSOR=none
>
> And then get this error message:
>
> WARNING: No compression is not supported for GRASS raster maps, using
> default ZLIB
>
> Seems like a shame to not have this as an option. I'll try speeding it up
> by tweaking the compression method and amount.
>
>   -k.
>
> On 2020-02-29 at 08:37 -08, Ken Mankoff <mankoff at gmail.com> wrote...
> > Hi,
> >
> > I'd like to turn off compression for all maps. Is this possible with
> > g.gisenv or environment variables? The g.gisenv manual only shows how
> > to choose among compression methods, not disable it.
> >
> > This does not seem to work:
> >
> > g.gisenv set="GRASS_COMPRESSOR=none" # optimize for speed
> >
> > I can decompress one map with:
> >
> > r.compress -u map=foo
> >
> > But I'm trying to skip the time spent compressing and decompressing
> > altogether. I could use a small speed boost, and this seems like an
> > easy way to speed things up - I can afford the disk space for all the
> > temporary intermediate maps.
> >
> > Thanks,
> >
> >   -k.
>
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