Apparent memory leak and performance problems
Dear all,my company is developing a scientific application with ~30000 registered users. We encountered some problems with OpenCL support in Windows 8.1, using the latest driver 10.18.14.4080, and...
View ArticleWill future Gen8 driver support fine-grained SVM for HD5300?
Hi, I have a HD5300 platform at hand. But it seems that current Gen8 driver only supports coarse-grained SVM for HD5300. Will future Gen8 driver support fine-grained SVM for HD5300?
View ArticleDoes HD5300 support the 'new globally coherent memory type' mentioned in...
Hi,I have a HD5300 platform at hand. Does HD5300 support the 'new globally coherent memory type' mentioned in 'Compute Architecture of Intel Processor Graphics Gen8.pdf'? If yes, then how to write...
View Articleoffline/online opencl compilation difference
Dear Community Members!I have a program, which makes some calculations with the help of the opencl kernel, which runs on the cpu. I also make these calculations without opencl and check for errors....
View ArticleProblems with lgamma value on HD 4000/4400
I have developed a probabilistic sampling program that made use of the "lgamma" function in OpenCL. The program runs normally on most platforms, including Intel's CPU using Intel's OpenCL driver....
View ArticleTry OpenCL 2.0 on HD5500 iGPUs
Hi Robert, From the experience of using recent Intel OpenCL SDK, it shows that the OpenCL 2.0 is only support for CPU.The OpenCL version for GPU is still 1.2.However, by checking Khronos OpenCL...
View ArticleHandle many kernel arguments in OCL Kernel
Dear all,I am developing an OpenCL kernel for particle simulation and I face a problem. I have to transfer a lot of arguments to the device (I have not counted properly, but from the original code it...
View Articlegemm sample program is black out
I tried General Matrix Multiply (GEMM) sample (https://software.intel.com/en-us/articles/gemm) on my pc.But, if the matrix size is more than 2048 x 2048 program stops with black out.Black out back in a...
View ArticleVS Memory/Watchlists window content inaccurate during debugging
Using code buiider 1.3.0.92 under windows 7 and VS 2010 sp1....If I run a hack kernel like this... __kernel void test_local() { __local int s_testValue[10][10]; __local int* rowStartThisThread =...
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More flexibility in kernel analysis (Code Builder, local sizes)
Hi folks,I'm facing a problem on workgroup size definitions during a session of kernel analysis, I'd like to know if it is possible to benchmark all the combinations of local work size possible.For...
View ArticleOpenCL.lib Missing
I've recently installed everything that I thought would be necessary for developing a OpenCL application, but apparently I was wrong. I have the necessary header files and the .dll files, but the .lib...
View ArticleHow does Code Builder measures time ?
Hi everyone,I'm willing to know how exactly the Intel Code Builder tool measures time through execution, is there any documentation on this ? I can't find any.Thanks !
View ArticleOpenCL buildprogram on Xeon Phi
I am trying to compile a kernel in OpenCL on the Xeon Phi, and it gets stuck in a loop with the error message "Internal error (unused)(16,8) 04010026_1871" Is there anything that can be done to fix...
View Articlecreate buffer ok，but not write really
I use clCreateBuffer（CL_MEM_READ_ONLY | CL_MEM_USE_HOST_PTR,） function create 3 buffers， every buf has 300M, the driver version 10.18.10.3621，the Device global alloc mem size is 332185(KB) ,it is...
View ArticleCreate kernels from pre-compiled .ir
Hello,I have a question regarding the creation of kernels from pre-compiled .ir files.I create a .ir using ioc32 –cmd=compile –input=kernel.cll –device=GPU –ir=kernel.orIn my code I:a) Load the .ir...
View ArticleGL CL interop on CPU
I have a question regarding OpenCL / OpenGL interoperation when run on an Intel CPU.I just don't quite understand the purpose of the cl_khr_gl_sharing extension on a CPU.When a shared GL-CL context is...
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Compiler crash [15.1, Ubuntu]
The attached kernel crashes the Intel OpenCL Runtime 15.1 (Ubuntu):Both operands to ICmp instruction are not of the same type! %37 = icmp slt i32 %35, i64 0 Both operands to a binary operator are not...
View ArticleKernel debuuging to find an erroring work item
Hi. During visual studio code builder debugging, I have a clEnqueueNDRangeKernel failing for a certain kernel, with a bad memory access. To find out which work item (of 512) is causing the error, I...
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Broadwell 64-bit ulong performance regression on min/max/compare
Intel IGP CL team,I'm seeing a huge performance regression between Haswell and Broadwell when comparing 64-bit ulong's or performing min/max operations.Please check the number of instructions that...
View ArticleLow throughput - how to diagnose?
Hi,I've just recently started programming opencl on my IvyBridge GT2 (16 EU) powered Laptop, however results don't look that promising for my use-case. To narrow things down, I started with a very...
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