[GRASS-dev] openMP support in GRASS GIS

[Jaro Hofierka]

Hi Anna,

many thanks! Please keep it in addons for a while, as it is referenced 
in the paper. Yes it is possible to use it in r.sim.sediment as well 
because actually we have parallelized the simulation library (simlib) 
used by r.sim.sediment as well. But it needs some modification of 
Makefile and main.c to include openMP. Otherwise it runs without OpenMP.
Also please note that I have changed the maximum number of walkers in 
waterglobs.h to 20 million from 7 million. This might be needed to 
compute large grids, but the simulation algorithm should be checked 
because sometimes it reports error (nwalk > maxw) when assigns walkers 
(this is not related to openMP).

Best wishes,

Jaro

Anna Petrášová napísal(a):
> Dear Jaro and all,
>
> During recent code sprint in Boston I ported r.sim.water.mp to GRASS
> r.sim.water and r.sim.sediment. I tested it with r.sim.sediment and it
> seems to work, so let me know if there are any reasons parallelization
> shouldn't be used with r.sim.sediment. I removed all the commented
> parts which you probably put there during experimenting. I didn't
> remove the version in addons, because you have it linked in your
> paper, but maybe we should put a note in the r.sim.water.mp manual,
> that the latest version is in the core? As for r.sun, when I have
> time, I will look at it.
>
> Anna
>
> On Sat, Aug 5, 2017 at 4:24 AM, Jaro Hofierka <jhofierka at gmail.com> wrote:
>> Hi Markus,
>>
>> This is just a small contribution and I would like acknowledge help of
>> reviewers to improve the manuscript. I believe more such grass-based papers
>> in scientific journals will further promote GRASS within the wider
>> scientific community.
>> Of course, we would welcome if this could go to the trunk version. Vaclav
>> helped us is v.surf.rst and it is already there and I hope he could also
>> help with r.sim.water and r.sun. He can contact me or my colleagues and we
>> will provide any assistance.
>>
>> Best wishes,
>>
>> Jaro
>>
>> Markus Neteler napísal(a):
>>
>>> Hi,
>>>
>>> just saw that this article got published (congrats, Jaro and team):
>>>
>>> Hofierka, J., Lacko, M., Zubal, S., 2017. Parallelization of
>>> interpolation, solar radiation and water flow simulation modules in
>>> GRASS GIS using OpenMP. Computers & Geosciences.
>>> doi:10.1016/j.cageo.2017.07.007
>>>
>>> Questions: since the code is already in addons, how about merging the
>>> changes into trunk?
>>>
>>> Markus
>>>
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>