[Starpu-devel] Fwd: Re: StarPU: OpenCL do not work well

[Nathalie Furmento <nathalie.furmento@labri.fr>]

-------- Original Message -------- Subject: Re: [Starpu-devel] StarPU: OpenCL do not work well Date: Sat, 12 Mar 2011 00:47:53 +0100 From: Sylvain HENRY <sylvain.henry@inria.fr> To: starpu-devel@lists.gforge.inria.fr

Hi,

For debugging purpose, could you add the following line in examples/basic_examples/vector_scal_opencl.c just after the clGetKernelWorkGroupInfo(...):

fprintf(stderr, "Work group size: %ld\n", local);

This should tell you what the block size used is. If it doesn't divide 2048, is equal to 0 or is greater than 1024, the error is here. Please report this value to us.

Anyway, for this particular case, replacing:
err = clEnqueueNDRangeKernel(queue, kernel, 1, NULL, &global, &local, 0, NULL, NULL);
with
err = clEnqueueNDRangeKernel(queue, kernel, 1, NULL, &global, NULL, 0, NULL, NULL);
in the same file, should solve the issue. (I didn't try this fix)

Cheers
Sylvain


Le 11/03/2011 21:34, Leo Li a écrit :

Hi, everybody

My name is Lu Li. I am a master student at Linkoping University, Sweden.

I currently do my master thesis based on StarPU under professor
Christoph W. Kessler. And I got a problem, could someone help me.
Thanks.

My problem is that  if I run vector_scale example after setting
environment variables:
export STARPU_NOPENCL=1
export STARPU_NCUDA=0
export STARPU_NCPUS=0
I will get an error(See attached invalid.jpg, the screenshot). StarPU
works fine with CPU and CUDA.

I have run some test on my OPENCL device.(Result shown in attached
file: oclDeviceQuery.txt) Seems Opencl device is ok. So There might be
some configuration problem on StarPU.

Could someone help me. I can offer more detail if needed. Thank you.
  

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