Difficulty in making a minor code parallel.
I have an array of 100 elements and I want to put some elements of it in a different array in the kernel code, The problem is that if 'p' is an array with 100 elements and say 'q' with 40 elements, p...
View ArticleRegister capacity of AMD Radeon Mobility 5870
Hello,I have a AMD Radeon Mobility 5870 and I am using OpenCL with it.I believe that the standard desktop Radeon 5870 has 256K of registers per compute unit. Is the same true for the Mobility 5870? If...
View ArticleenqueueNDRangeKernel / Invalid work group size error
hello, i am trying to use opencl (api 1.2) on a bit older hardware and software - socket am3 cpu/a 5770 and a 6550 gpu, debian/squeeze w. 3.2 backports kernel and amd-driver version 12.4 <-- i use...
View ArticleBug- 100% CPU usage when >1 GPU installed & used
normally: 1 gpu installed & used = 1% cpu usageThis is very commonly talked about so its not just me and you likely already know about it.during opencl activity (btc mining) when i had 1 card...
View Articlecl_khr_fp16 support?
Is cl_khr_fp16 not supported on any AMD hardware? I am getting the following error? error: can't enable all OpenCL extensions or unrecognized OpenCL extension #pragma OPENCL EXTENSION cl_khr_fp16 :...
View ArticleQt5.1 + multi-device OpenCL-GL interop
Hi everyone! I took on a nice project that uses Qt5.1 alpha and there are problems with OpenCL-GL interop. Let me not repeat myself, but simply link the Qt forum post I made there. All remakrs are...
View ArticleOpenCL kernel memory optimizations
Hi all. I'm implementing integer Discrete Cosine Transformation (iDCT) kernel in OpenCL 1.1The code looks like this: typedef unsigned char pixel; __kernel __attribute__(( reqd_work_group_size(8, 8, 1)...
View ArticleBlender Cycles(Opencl on AMD GPUS)
Dear Opencl DeveloperWhy doesn't the AMD opencl compiler work with blender cycles?whenever i compile the blender cycles kernel, the system either crashes due to lack of memory, or takes too long to...
View ArticleError handling mmap: Memory leak and "GART error"
We are trying to process images from a framegrabber without copying them to an intermediate buffer. The data appears on a mmaped buffer. Every time we use the mmaped buffer on OpenCL we are getting an...
View Articlecontext and program creation
Hi forum, How many program object are we allowed to create in a single context ? Any example or case studies to this issue? RegardsSajjadul
View ArticlePossible problem with atomic_cmpxchg?
Hi guys, I've been trying to write a kernel which multiplies a row vector into a CSR format stored matrix, but it gives a different result each time it runs. The GPU is AMD Radeon™ HD 7970 Graphics....
View ArticleHow to fill H264_picture_parameter_2 structure
Hi all, I'm trying to implement an H264 decoder using opencl 1.2 and I'm currently studying the OVDecodeRender sample project. SideNote: I have been trying to compile the OVDecodeRender.zip sample, but...
View Articlecl_amd_c1x_atomics EXTENSION
Hi, I have an extension with a name of cl_amd_c1x_atomics on my tahiti. What functions are enabled by this extension?
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OpenCL compiler bugs
I can trigger 3 bugs in the OpenCL compiler for which I can supply code: The compiler crashes in case of infinite loop and "-cl-opt-disable". Just put a goto and it segfaults. The compiler from...
View ArticleDifficulty in making a minor code parallel.
I have an array of 100 elements and I want to put some elements of it in a different array in the kernel code, The problem is that if 'p' is an array with 100 elements and say 'q' with 40 elements, p...
View ArticleWhich GPU should we buy?
Hi, we are doing some research about the GPU. We will try to implement some algorithms on the GPU. We do not know yet if the algorithmsreally fit for the GPU architecture. I did some research back in...
View ArticleBug- 100% CPU usage when >1 GPU installed & used
normally: 1 gpu installed & used = 1% cpu usageThis is very commonly talked about so its not just me and you likely already know about it.during opencl activity (btc mining) when i had 1 card...
View ArticleSpectral Studio on ATI GPU
Hi, We are working on a GPU rendering software (http://www.spectralpixel.com) and we are currently trying to make it run on ATI GPU. But, when we compile :1) The computer freeze for some time, then get...
View ArticleTheoretical peak FLOPS
I have question regarding the theoretical peak FLOPS of my graphics card.I have a Radeon HD 7970 GHz Edition which has a peak of 4096 GFLOPS. Now I would wanted to calculate this number.When I just...
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XCloseDisplay and clGetPlatformIDs
i catch segmentation fault in XCloseDisplay(display);If before it i call clGetPlatformIDs(0, NULL, &numPlatforms);I'm doing something wrong, or it's a bug?
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