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I have a Laptop with Intel(R) HD Graphic 520 GPU in it. It added OpenCL developer Packages to Cygwin. I have found a small Mandelbrot-Set calculator program for OpenCL in C on Github. It is for Apple, so I modified the Makefile to use the proper headers and settings for gcc. Now the code compiles and executes nicely (bmp file created):
$ ./mandelbrot.exe
Device 0: GenuineIntel pthread-Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz
I have two questions:
#1. How can I add (if it is possible) the Intel GPU to the /etc/OpenCL/vendors list? I tried to install from Intel site the Intel CPU runtime for OpenCL Applications for Windows OS and Intel Graphics Technology driver package, but I do not know where can I find the proper OpenCL dll I can point in the intel.idc file.
#2. In /etc/OpenCL/vendors I have found a pocl.icd file pointing to cygpocl-2.dll. I assume this is the pthread library. But it seems to me it is running only a single thread, although I have 4 cores. Should I do any modification to run it in multiple threads? I debugged the code and it seems that as there are only one device found, so it runs only on one thread. In the initialization function it sets the device work_size property for processing a stirp per device of the final bmp. But as there is only one device, the whole bmp is processed by one run (one clEnqueueNDRangeKernel and one clEnqueueReadBuffer is called).
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To compile and run OpenCL programs in Cygwin:
- Ensure that you have the latest GPU driver by installing from https://www.intel.in/content/www/in/en/support/intel-driver-support-assistant.html
- Install OpenCL header and Library from Khronos OpenCL Registry - The Khronos Group Inc or from Intel OpenCL SDK Choose & Download Intel® SDK for OpenCL™ Applications , if you have not already done so.
- Install libOpenCL1 cygwin package via Cygwin Package Manager Cygwin Installation
- Replace the cygwin's OpenCL library with the DLL from Intel (Copy as below)
- Copy file "/cygdrive/c/Windows/System32/OpenCl.dll" to directory "/cygdrive/c/cygwin64/bin/" and alter it as "/cygdrive/c/cygwin64/bin/cygOpenCL-1.dll" (You can save old dll as "/cygdrive/c/cygwin64/bin/cygOpenCL-1-old.dll")
- Ensure that “/etc/OpenCL/vendors/intel.icd” points to “cygOpenCL-1.dll”
- Recompile and run your OpenCL program for GPU.
Please try this and share your results.
Thanks,
Anita
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Hi Tahir Azemgrm,
I am checking to see whether you are now able to access the GPU in Cygwin.
Thanks
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Hi,
We have not heard back from you. This thread will no longer be monitored by Intel. If you need further assistance, please post a new question.
Thanks & Regards,
Anita
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