Parallella Community

Re: Harris corner detector and openCL

2015-04-17T14:30:12+00:00

HI

i'm trying to optimize the sobel application https://github.com/sclukey/parallella-o ... ter/opencl

I think the transmission time between epiphany(kernel) and ARM is too long, when i took the initial sobel program and delete all the instructions and i tried gbb[i] = gaa[i]

the time measured is 0.33 second .

Is there any solution to minimize the transmission time between ARM and epiphany ???

Statistics: Posted by Nader_Jendoubi — Fri Apr 17, 2015 2:30 pm

Re: Harris corner detector and openCL

2015-04-17T01:17:48+00:00

At this point we have not come anywhere near the epiphany. clcc operates entirely on the ARM host cores.

Get an executable and then figure out if the algorithm works. I assume that you need to pass the routine an image. Find one that is around 20k (i.e. would easily fit onto one core) and run it. That will eliminate any concern about the epiphanies memory getting in the way. Once you have the algorithm working then use bigger and bigger images to test if your partitioning is working.

The only way to operate in the absence of documentation is to solve one problem at a time.

Statistics: Posted by nickoppen — Fri Apr 17, 2015 1:17 am

Re: Harris corner detector and openCL

2015-04-16T12:25:27+00:00

Do you think that is a memory problem i think the epiphany memory is not enough what do you think??

Statistics: Posted by Nader_Jendoubi — Thu Apr 16, 2015 12:25 pm

Re: Harris corner detector and openCL

2015-04-16T12:04:54+00:00

Statistics: Posted by nickoppen — Thu Apr 16, 2015 12:04 pm

Re: Harris corner detector and openCL

2015-04-14T13:19:28+00:00

Statistics: Posted by Nader_Jendoubi — Tue Apr 14, 2015 1:19 pm

Re: Harris corner detector and openCL

2015-04-11T00:05:35+00:00

Statistics: Posted by nickoppen — Sat Apr 11, 2015 12:05 am

Re: Harris corner detector and openCL

2015-04-10T18:09:20+00:00

Statistics: Posted by Nader_Jendoubi — Fri Apr 10, 2015 6:09 pm

Re: Harris corner detector and openCL

2015-04-10T18:07:01+00:00

Statistics: Posted by Nader_Jendoubi — Fri Apr 10, 2015 6:07 pm

Re: Harris corner detector and openCL

2015-04-10T00:33:16+00:00

The coprthr_primer-1.6.0.pdf shows the syntax of clcc as:

clcc [options] file1.cl file2.cl ... [-o output.o]

Try putting the kernel files first and the output second.

Otherwise, see if the JIT compiler works.

Statistics: Posted by nickoppen — Fri Apr 10, 2015 12:33 am

Re: Harris corner detector and openCL

2015-04-09T16:25:54+00:00

the clcc command is:

clcc -o device/bin/kernel.o -c device/src/kernel.c

Thanks for your help

Statistics: Posted by Nader_Jendoubi — Thu Apr 09, 2015 4:25 pm

Re: Harris corner detector and openCL

2015-04-09T14:09:50+00:00

there was a lot of problems in the syntax of the code and i correct them all
i remember that some message with the kind of : e32-elf : no such file e32-objcopy : no such file but when i correct the syntax problems it disappears

when i compile, only that message shows and no file was generated.

Statistics: Posted by Nader_Jendoubi — Thu Apr 09, 2015 2:09 pm

Re: Harris corner detector and openCL

2015-04-09T10:41:12+00:00

Please post the whole of the clcc call and the compiler output please. There could be lot's of things wrong.

Statistics: Posted by nickoppen — Thu Apr 09, 2015 10:41 am

Harris corner detector and openCL

2015-04-08T21:09:34+00:00

Hi

I'm very new in using openCL for Parallella
I expoited the sobel filter project available at the link https://github.com/sclukey/parallella-o ... 148f196f1b

and i write a kernel to realise a harris corner detector application : https://www.dropbox.com/s/64jjr76v2ulxd ... l.txt?dl=0

and i write the host code : https://www.dropbox.com/s/dv6nowou201v06p/host.txt?dl=0

in the kernel code i traduct the harris algorithm and i return the coordinates of a number of pixels used with the function cvcircle to draw circles around the harris points

when i compile the kernel with clcc, get this message : clmesg error: clcc.c(668) : clccl returned non-zero exit status
but i didn't get the .o file
i still don't know what is my fault.

Please i need some help with this code. Can anyone suggest to me any solutions??

Thanks

Statistics: Posted by Nader_Jendoubi — Wed Apr 08, 2015 9:09 pm