Raspberry Pi now with OpenCL GPU Support (VC4CL VideoCore IV OpenCL)

22 Jan 2019

Next Biggest Breakthrough for Raspberry Pi is here!

Today I successfully compiled OpenCL on raspberry pi 3, Opening the door for numerous GPU possibilities for Raspberry Pi, Love the performance in FFMPEG(1080p rendering) and now looking forward to Deep-Learning applications on this little beast.

VC4CL is a newer effort bringing OpenCL to the Broadcom VideoCore IV GPUs as found in the Raspberry Pi boards. VC4CL implements OpenCL 1.2 for the VideoCore 4 graphics processor albeit the embedded profile standard. This VC4CL implementation does support the OpenCL ICD.

Notable supported features:

- Performance-wise it beats the results of the pocl implementation for the floating-point benchmark (reaching up to 4GFLOPS!) and has an expected inferior memory-access speed (at up to 120MB/s). More info. here

- 64-bit data-types (long, double)

- Active development

More Information on this Project can be found here: https://github.com/doe300/VC4CL

Kudos to all the project DEVS!!!

Source: https://www.reddit.com/r/raspberry_pi/comments/ailmgj/raspberry_piopenclgpu_vc4cl_videocore_iv_opencl

VC4CL Performance Details: https://github.com/doe300/VC4CL/wiki/Performance

VC4CL Github: https://github.com/doe300/VC4CL

cstanton over 6 years ago in reply to zhaod

zhaod , I recommend you raise an issue on the github repo.
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zhaod over 6 years ago in reply to cstanton

Thank you very much for your reply.

According to the guide of https://github.com/doe300/VC4CL/wiki/How-to-get, I successfully install VC4C, VC4CL and VC4CLStdLib. But I found the error when calling function clBuildProgram to build kernel, the forllowing is detailed error information.

symbol lookup error: /usr/local/lib/libVC4CL.so: undefined symbol: _ZN4vc4c11Precompiler10precompileERSiRSt10unique_ptrISiSt14default_deleteISiEENS_13ConfigurationERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERKNS_8OptionalISD_EESH_

But I also find the symbol in libVC4CC.so and libVC4CL.so, the following is detailed information:

pi@raspberrypi:~ $ nm /usr/local/lib/libVC4CL.so | grep _ZN4vc4c11Precompiler10precompileERSiRSt10unique
U _ZN4vc4c11Precompiler10precompileERSiRSt10unique_ptrISiSt14default_deleteISiEENS_13ConfigurationERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERKNS_8OptionalISD_EESH_

pi@raspberrypi:~ $ nm /usr/local/lib/libVC4CC.so | grep _ZN4vc4c11Precompiler10precompileERSiRSt10unique
00842780 T _ZN4vc4c11Precompiler10precompileERSiRSt10unique_ptrISiSt14default_deleteISiEENS_13ConfigurationERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERKNS_8OptionalISD_EESJ_

Could you give me some suggestion to solve this issue? Thank you. Look forward to your reply.
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cstanton over 6 years ago in reply to zhaod

https://github.com/doe300/VC4CL/wiki

https://github.com/doe300/VC4CL/wiki/How-to-get
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zhaod over 6 years ago

I download VC4C and VC4CL from github( https://github.com/doe300/VC4CL), but the Raspberrypi still can't run OpenCL. When I call function clGetPlatformIDs, the return value is -1001. How do you install VC4C and VC4CL or set which parameters on Raspberrypi. My machine type is Raspberry PI 3 Model B Plus Rev1.3. Could you help me? Thank you very much.

Look forward to your reply.
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vimarsh_ over 6 years ago

if we use GPU with OpenCL then what will be the benefit in time or resource while doing a little bit of image recognition?
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