Hi Victor, (after 2 crashes of mail programs and browsers, I hope this time I will be able to send this mail)
There is no need to check all patches - let me explain. The project consists of two parts: the front-runners (learning in a group) and the rest (people learning from the group). The front-runners will pick a filter, then all are going to port it to OpenCL - each version will be discussed with the group and tested on the machines. By combining all that has been learned, the kernel with the best results will result in a single patch. We mostly need your help with the first few patches. People who find improvements after the first path, first have to do a list of checks before sending a patch. The people who have done the class successfully, can focus on the harder problems you wrote down. When we get to that point, what I ask from you is to make the descriptions of the 4 points. StreamComputing will help out too, if time permits - our first focus is to guide the front-runners. We might be most useful in benchmarking the various kernels on our own servers - what build-system do you use, by the way? Buildbot.net? Yes, if you agree that I setup this OpenCL-learning-project for GEGL, a tutorial would be the best help to get people started. I saw the API is quite useful and can be used to create a small program that reads an image and kernel, and writes an image, checks error-level and shows the time the kernel took. Later interactive mode can be added, or to benchmark on a directory of images. Yes, I've checked a few filters. Will be good examples. We do need to profile&benchmark them, to see if they can be made faster before people use it to learn. Cheers, Vincent On 31 July 2015 at 20:18, Victor Oliveira <victormath...@gmail.com> wrote: > Hi Vincent! Welcome to the GEGL list. > > You can refer to http://wiki.gimp.org/wiki/Hacking:Porting_filters_to_GEGL > for the list of filters in GIMP and GEGL that have been ported. > > Being honest I don't think there's enough people here with OpenCL > background to review that many patches! So, a great way of helping out with > the OpenCL support is to get involved with the community, build knowledge > of the GEGL codebase and help out not only with the OpenCL bits but also > infrastructure work. We've had people come and go that implement filters > but as important as that is to keep engaged and be sure it keeps working. > > So, personally, what I think it's the best way to get OpenCL out there for > users which I'd do myself if I had the time {in order of importance}: > > 1) Verify that currently implemented filters produce correct results and > are faster than CPU. We are in need of a systematic verification of > correctness of all filters, with different test images cases. > 2) Stress test of the GPU code. What happens if you open another > application that steals our GPU memory? > 3) GPU profiling at application-level? Are we doing something stupid so > that there's bubbles in our GPU pipeline? > 4) Work with the GIMP team to minimize the tilling issue. > > As I said, unfortunately I don't have the time to actually code new stuff > but I'd extremely interested in helping out to have a simple tutorial that > could bring new people to the project, what you have in mind? > > By the way, have you given a look at this for an example of pixelwise > filter? > > > https://git.gnome.org/browse/gegl/tree/operations/common/brightness-contrast.c > https://git.gnome.org/browse/gegl/tree/opencl/brightness-contrast.cl > > We can keep discussing here ideas. > > Regards, > Victor > > On Thu, Jul 30, 2015 at 12:40 PM, Vincent Hindriksen < > vinc...@streamcomputing.eu> wrote: > >> Hi, >> >> You might assume I will ask about the current state of OpenCL, but my >> question is different. I want to help to get OpenCL support get done. >> >> In short I want a group of beginners try to implement the same filter in >> OpenCL, learning together. There will be support for them, so eventually >> they create a correct and fast kernel. And yes, there is serious demand for >> this. All I need from you is to help me develop a tutorial to get from zero >> to the first kernel, while learning the basics of OpenCL. I think that we >> can do a filter per week, while improvements will keep coming because of a >> high-score list. >> >> Is there somebody I can talk to about this? Or can we discuss it here? >> >> Kind regards, >> Vincent >> >> _______________________________________________ >> gegl-developer-list mailing list >> List address: gegl-developer-list@gnome.org >> List membership: >> https://mail.gnome.org/mailman/listinfo/gegl-developer-list >> >> >> > -- -- ___________________________________________________________ V.G.Hindriksen MSc., CEO StreamComputing BV - http://www.streamcomputing.eu Location: Amsterdam, Netherlands, Europe Cell: +31 6 45400456 NEW PHONE NUMBER: +31 854865760 KvK-number (Chamber of Commerce): 61901873 Rabo Bank (IBAN/SEPA): NL89RABO0113885571 - BIC: RABONL2U OpenCL Newsletter: http://bit.ly/OpenCLnewsletter OpenCL Twitter : http://twitter.com/StreamComputing OpenCL Blog : http://www.streamcomputing.eu/blog ___________________________________________________________
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