OpenCL C is a programming language based on C99 that is used for writing kernel code to be used in OpenCL.
Questions tagged [opencl-c]
88 questions
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0 answers
How to allocate Local Work Item sizes in OpenCL
I've set up a convolution kernel in OpenCL to convolve a 228x228x3 image with 11x11x3x96 weights to produce 55x55x96 filters.
My code without allotting localWorkSize works perfectly, but when I do allot it, I start getting errors
My questions are…
0
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1 answer
openCL hello World display garbage output
i am trying a simple helloWorld openCL code, it compiles without errors
but display garbage : ╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠╠
the error function detected an error while building so a removed the "-cl-std=CL2.1" in…
Mourad
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1 answer
Passing C structures to OpenCL kernel
I have next structure in my host program:
typedef struct s_figure
{
cl_float reflection;
cl_int color;
enum e_figure type;
cl_float3 vector1;
cl_float3 vector2;
cl_float param1;
…
Andrew Butok
- 25
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1 answer
parallel opencl kernel execution
I am trying to execute multiple kernels in parallel. Each kernel is independent of each other. I am trying to execute the kernel on GPU. What I think is out of order execution and enqueue each kernel separately. Is that the way to approach this…
user10149483
- 19
- 1
0
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0 answers
How can i use opencl in loop of host program?
I want to write the input image into the buffer and execute the kernel file in the while loop of the host program (not in the kernel file). I did set OpenCL stuff (context, device, buffer, command queue, etc) out of the while loop, write the image…
BHYoo
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- 3
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2 answers
Throughput calculation in OpenCl
I am trying to calculate the throughput of my kernel which is written in my openCL. But I am not sure how to do that, I have tried to find some file generated after compilation which shows throughput as 0.435(" found in the .attrb file") but not…
user10149483
- 19
- 1
0
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1 answer
Opencl: global thread synchronization between two loops
I have an opencl kernel that computes two global buffers in two loops.
The first loop does some computations with a global thread and writes the result to the output buffer "OutBuff". Then the second loop updates the values of the global buffer…
0
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1 answer
OpenCL program doesn't build when a function is called from a kernel
This question follows from this question.
I have a kernel which calls a regular function. When I build and run my code, I get the following output:
Number of devices: 2
building program failed
-----COULD NOT CREATE KERNEL!!---
The problematic…
a_sid
- 577
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- 28
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Occupy all GPGPU memory and invoke kernel for all the data pieces
I need to allocate as much of struct Things as GPGPU memory allows and invoke the kernel for every struct Thing.
OpenCL disallows allocating all the CL_DEVICE_GLOBAL_MEM_SIZE memory at once - you can allocate at most CL_DEVICE_MAX_MEM_ALLOC_SIZE per…
Slaus
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1 answer
Code terminates after saying COULD NOT CREATE KERNEL on Eclipse
I am trying to translate a sequential C code for a MJPEG decoder into OpenCL. I got the C code from this github project.
I am now trying to convert the original C code for IDCT into OpenCL.
I copied and pasted the code from the .c file for IDCT and…
a_sid
- 577
- 10
- 28
0
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1 answer
How the OS and the Driver effects the OpenCL kernel timing?
For measuring an OpenCL kernel execution time we either uses a:
1- CPU Timers .. but we need to consider that the OCL functions are non-blocking hence we need to use the clFinish() routine for achieving full throughput.
2- GPU Timers .. that is…
mmain
- 333
- 3
- 19
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1 answer
Which is more efficient in OpenCL: if conditions or for loops?
I have a piece of OpenCL code like this
if (Sum[0] < Best)
{
Best = Sum[0];
iBest = 1;
*aBits = Bits[0];
}
if (Sum[1] < Best)
{
Best = Sum[1];
iBest = 2;
*aBits = Bits[1];
}
if (Sum[2] < Best)
{
Best = Sum[2];
iBest…
Harsh Wardhan
- 2,110
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- 51
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1 answer
How do I pass an array to an OpenCL kernel?
I have an array which I want pass to an OpenCL kernel. Part of my code is
cl_mem arr_cl;
unsigned int arr[4] = { 0 };
arr_cl = clCreateBuffer(ocl.context, CL_MEM_ALLOC_HOST_PTR, 4*sizeof(unsigned int), NULL, &status);
arr = (unsigned…
Harsh Wardhan
- 2,110
- 10
- 36
- 51