[GRASS-user] error in remove mask

[Giuseppe Amatulli]

Hi Markus,
in reality the computation beyond the mask problem is very complex, I will
try to summarize.
I have the UNIT3753 mask sit on the PERMANENT and I create 1000 location in
a multicore environment (HPC).
Each location use the UNIT3753-mask from the PERMANENT. This action produce
that the  cell_misc/UNIT3753/reclassed_to is written simultaneously from
different cores.
I think that this action creates a  reclassed_to file very large and
probably also with different permission which was not be able to be
removed.

I solved by manually  remove the reclassed_to file, so now the process is
running smoothly.

A potential solution would be:
1) for each location  g.copy raster=PERMANENT,UNIT3753 , and than apply the
r.mask using the UNIT3753 in the location and not in the PERMANENT.
This would work but data duplication will be there.
2) a second solution would be if  the reclassed_to can have a unique name
(e.g. reclassed_to$$) associate to the location.

Any thought?
Thank you
Best Regards
Giuseppe
p.s. in few weeks I will be in Berlin so we may chat in person.






On 24 May 2017 at 18:29, Markus Neteler <neteler at osgeo.org> wrote:

> On Wed, May 24, 2017 at 11:40 PM, Giuseppe Amatulli
> <giuseppe.amatulli at gmail.com> wrote:
> > Hi Nikos
> > I just sort out.
> > the file /PERMANENT/cell_misc/UNIT3753/reclassed_to was very big (2.5g)
> and
> > it  was not be able to be removed with the r.remove.
>
> That size is not an issue at all (the EU DEM is 25GB or more for
> example)... the problem must be elsewhere. Happy to help if possible.
> BTW: I have compiled GRASS 7.2 also for RHEL via EPEL, see the download
> page.
>
> Markus
>
>
> --
> Markus Neteler, PhD
> http://www.mundialis.de - free data with free software
> http://grass.osgeo.org
> http://courses.neteler.org/blog
>



-- 
Giuseppe Amatulli, Ph.D.

Research scientist at
Yale School of Forestry & Environmental Studies
Yale Center for Research Computing
Center for Science and Social Science Information
New Haven, 06511
Teaching: http://spatial-ecology.org
Work:  https://environment.yale.edu/profile/giuseppe-amatulli/
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