GSoC 2021: Parallelization of existing modules for GRASS GIS

Title:	Parallelization of existing modules for GRASS GIS
Student Name:	Aaron Saw Min Sern
Organization:	​OSGeo - Open Source Geospatial Foundation
Mentor Name:	Huidae Cho, Vaclav Petras, Māris Nartišs
GSoC proposal:	​View proposal
GitHub Repository:	​View account

Abstract

The current state of OpenMP support for raster modules is limited. Many of such modules can benefit from parallelization. This project aims to provide parallelization to modules chosen based on their frequency of usage and its implementation complexity.

Timeline

Time Period	Milestones
	Tasks	Status
May 17th - June 7th Community Bonding	Introduce myself in dev and SOC mailing lists Get in contact with mentors and discuss project Prepare the wiki page Set up the GitHub repository for project Set up developer environment	Ok
June 7th - June 11th Week 1	Parallelize r.proj Parallelize r.neighbor Parallelize r.univar
June 14th - June 18th Week 2	Parallelize r.cross Parallelize r.blend Parallelize r.composite Parallelize r.texture
June 21st - June 25 Week 3	Parallelize r.mfilters Parallelize r.covar
June 28 - July 2 Week 4	Parallelize r.slope Parallelize r.basins.fill Parallelize r.sunhours Parallelize r.flow
July 5th - July 9th Week 5	Parallelize r.to.*
July 12th - July 16th Week 6: Evaluations	Parallelize r.resamp.*
July 19th - July 23rd Week 7	Parallelize r.resurf.*
July 26th - July 30th Week 8	Parallelize r.random.cells Parallelize r.random.surface Implement support for users to specify number of threads
August 2nd - August 6th Week 9	Parallelize r.li.* Finish documentation and tutorials
August 9th - August 13th Week 10	Finishing up, testing, documentation
August 16th- August 23rd Week 11: Final Evaluation and Code Submission	Submit code and final evaluation

Bonding period report

1) What did I get done during this period?

• I have set up a wiki page detailing my project and its progress. (1)
• I have set up my development environment. Here's the link to my repository. (2)
• I have gotten in touch with my mentors, and we are arranging a meeting this week.

2) What do I plan on doing next week?

I will be working on parallelizing 3 modules: r.proj, r.neighbor, r.univar. Based on the results, I will adjust my plans in the future weeks.

3) Am I blocked on anything?

No, it has been good so far.

(1) ​https://trac.osgeo.org/grass/wiki/GSoC/2021/RasterParallelization
(2) ​https://github.com/aaronsms/grass

Weekly reports

Week 1

1) What did I get done this week?

2) What do I plan on doing next week?

3) Am I blocked on anything?

Final report