Electric Goat Electric Goat - 6 months ago 49
Linux Question

Enable OpenCL over multiple platforms in Linux? How to proceed with ICD files?

Details



What drivers/packages do I have to install in order to enable OpenCL over multiple platforms: CPU (Intel), Integrated GPU (Intel), Dedicated GPU (NVIDIA)?

It would be nice to have all platforms running OpenCL 1.2 or above

I know it is probably a simple fix, maybe just the right selection of libraries/SKDs, but I am having some trouble getting more them one platform to work.

Running ubuntu 14.04: I have a intel core I5 with the integrated intel graphics and a dedicated NVIDIA Geforce 710m board.




Resources I have used



https://wiki.tiker.net/OpenCLHowTo

Here (under Debian) it tells me that I only need:


  1. Packages of ICD loaders: (you just need one of these)

  2. Packages of ICDs

  3. Package for headers






What I have already tried




  1. Installed CUDA7.5 (yes for all)


    • Had a black screen due drivers conflics


      • Resolved by uninstalling all nvidia drivers and installing 352

      • Still left Cuda SDK install



  2. From: How to make OpenCL work on 14.10 + Nvidia 331.89 drivers?


    • sudo apt-get install nvidia-331 nvidia-331-uvm nvidia-opencl-dev nvidia-modprobe

    • Those packages downgraded my drivers to 331 and 340


  3. Also from: How to make OpenCL work on 14.10 + Nvidia 331.89 drivers?


    • Linked libraries with:


      • sudo ln -s /usr/include/nvidia-352/GL /usr/local/include

      • sudo ln -s /usr/lib/x86_64-linux-gnu/libOpenCL.so.1 /usr/local/lib/libOpenCL.so


    • OpenCL 1.1 worked for NVIDIA GPU

    • Could not get OpenCL 1.2, thus decided to uninstall 331 and 340 and install again 352


  4. Installed 352 (again)


    • OpenCL 1.1 stopped working for NVIDIA GPU (and still does not work)


  5. Installed Intel
    opencl_runtime_14.2_x64_4.5.0.8.tgz



    • Created a simbolic link to intel ICD with:


      • sudo ln -s /opt/intel/opencl-1.2-4.5.0.8/etc/intel64.icd


    • OpenCL 1.2 worked for CPU (and still works)


  6. Installed clinfo
    sudo apt-get install clinfo



    • only intel CPU platform is detected


  7. Tried to install several different NVIDIA packages to get NVIDIA GPU work again but had no luck with that






Installed packages and some information:



ICD in Vendors?

ls -l /etc/OpenCL/vendors/
total 4
-rw-r--r-- 1 root root 15 Out 22 2015 Altera.icd
lrwxrwxrwx 1 root root 45 Abr 28 13:48 intel64.icd -> /opt/intel/opencl-1.2-4.5.0.8/etc/intel64.icd


Note the missing nvidia.icd

CL and GL - GL had a valid link... now is IN RED

ls -l /usr/local/include
total 4
lrwxrwxrwx 1 root root 31 Abr 28 12:48 CL -> /usr/local/cuda-7.5/include/CL/
lrwxrwxrwx 1 root root 26 Abr 27 11:44 GL -> /usr/include/nvidia-352/GL (IN RED COLOR - folder doesn't exist anymore)


.so Files

ls -l /usr/local/lib/ | grep CL
lrwxrwxrwx 1 root root 40 Abr 27 11:45 libOpenCL.so -> /usr/lib/x86_64-linux-gnu/libOpenCL.so.1


Installed packages

dpkg --get-selections | grep nvidia
nvidia-340 deinstall
nvidia-352 install
nvidia-libopencl1-340 deinstall
nvidia-libopencl1-340-updates deinstall
nvidia-libopencl1-352 deinstall
nvidia-libopencl1-352-updates install
nvidia-modprobe install
nvidia-opencl-icd-340 deinstall
nvidia-opencl-icd-352 deinstall
nvidia-prime install
nvidia-settings install


dpkg --get-selections | grep opencl
nvidia-libopencl1-340 deinstall
nvidia-libopencl1-340-updates deinstall
nvidia-libopencl1-352 deinstall
nvidia-libopencl1-352-updates install
nvidia-opencl-icd-340 deinstall
nvidia-opencl-icd-352 deinstall
ocl-icd-libopencl1:amd64 deinstall
ocl-icd-libopencl1:i386 deinstall
opencl-headers install
unity-scope-openclipart install


clinfo

clinfo
Number of platforms: 1
Platform Profile: FULL_PROFILE
Platform Version: OpenCL 1.2 LINUX
Platform Name: Intel(R) OpenCL
Platform Vendor: Intel(R) Corporation
Platform Extensions: cl_khr_icd cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_khr_spir cl_intel_exec_by_local_thread cl_khr_depth_images cl_khr_3d_image_writes cl_khr_fp64


Platform Name: Intel(R) OpenCL
Number of devices: 1
Device Type: CL_DEVICE_TYPE_CPU
Device ID: 32902
Max compute units: 4
Max work items dimensions: 3
Max work items[0]: 8192
Max work items[1]: 8192
Max work items[2]: 8192
Max work group size: 8192
Preferred vector width char: 1
Preferred vector width short: 1
Preferred vector width int: 1
Preferred vector width long: 1
Preferred vector width float: 1
Preferred vector width double: 1
Native vector width char: 16
Native vector width short: 8
Native vector width int: 4
Native vector width long: 2
Native vector width float: 8
Native vector width double: 4
Max clock frequency: 1800Mhz
Address bits: 64
Max memory allocation: 2040185856
Image support: Yes
Max number of images read arguments: 480
Max number of images write arguments: 480
Max image 2D width: 16384
Max image 2D height: 16384
Max image 3D width: 2048
Max image 3D height: 2048
Max image 3D depth: 2048
Max samplers within kernel: 480
Max size of kernel argument: 3840
Alignment (bits) of base address: 1024
Minimum alignment (bytes) for any datatype: 128
Single precision floating point capability
Denorms: Yes
Quiet NaNs: Yes
Round to nearest even: Yes
Round to zero: No
Round to +ve and infinity: No
IEEE754-2008 fused multiply-add: No
Cache type: Read/Write
Cache line size: 64
Cache size: 262144
Global memory size: 8160743424
Constant buffer size: 131072
Max number of constant args: 480
Local memory type: Global
Local memory size: 32768
Error correction support: 0
Unified memory for Host and Device: 1
Profiling timer resolution: 1
Device endianess: Little
Available: Yes
Compiler available: Yes
Execution capabilities:
Execute OpenCL kernels: Yes
Execute native function: Yes
Queue properties:
Out-of-Order: Yes
Profiling : Yes
Platform ID: 0x1659390
Name: Intel(R) Core(TM) i5-3337U CPU @ 1.80GHz
Vendor: Intel(R) Corporation
Device OpenCL C version: OpenCL C 1.2
Driver version: 1.2.0.8
Profile: FULL_PROFILE
Version: OpenCL 1.2 (Build 8)
Extensions: cl_khr_icd cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_khr_spir cl_intel_exec_by_local_thread cl_khr_depth_images cl_khr_3d_image_writes cl_khr_fp64





So...



How can I get NVIDIA gpu to also show up as a OPENCL 1.2 (or higher) platform? How about the integrated intel graphics?

Would AMD libraries work with my hardware?

Why most of the nvidia packages are marked as
deinstall
?

Answer

As mentioned before, three things are necessary:

From https://wiki.tiker.net/OpenCLHowTo

  • Packages of ICD loaders: (you just need one of these)
  • Packages of ICDs
  • Package for headers

Thus for an Intel CPU and a NVIDIA GPU

  • Packages of ICD loaders:
    • ocl-icd-libopencl1
  • Packages of ICDs
  • Package for headers
    • opencl-headers

However, to get it to work, it is necessary to make sure the packages are marked as install by dpkg --get-selections | grep opencl

sudo apt-get install --reinstall nvidia-opencl-icd-352 opencl-headers ocl-icd-libopencl1

On top of that, you must make sure that intel64.icd and nvidia.icd are in /etc/OpenCL/vendors (ls -l /etc/OpenCL/vendors).

That said, I had to link intel64.icd with:

cd /etc/OpenCL/vendors/
sudo ln -s /opt/intel/opencl-1.2-X.X.X.X/etc/intel64.icd

And, since nvidia.icd was not in the folder (even after the installation of the right package) I had to extract it and manually move from the deb package

dpkg -x /var/cache/apt/archives/nvidia-opencl-icd-352_352.63-0ubuntu0.14.04.1_amd64.deb ~/tempfolder
sudo mv ~/tempfolder/etc/OpenCL/vendors/nvidia.icd /etc/OpenCL/vendors/nvidia.icd
rm -r ~/tempfolder

Finally, make sure nvidia is the active GPU

sudo prime-select nvidia
sudo reboot -r now

Install and execute clinfo and both platforms should show-up.

clinfo 
Number of platforms:                 2
  Platform Profile:              FULL_PROFILE
  Platform Version:              OpenCL 1.2 CUDA 7.5.23
  Platform Name:                 NVIDIA CUDA
  Platform Vendor:               NVIDIA Corporation
  Platform Extensions:               cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_copy_opts 
  Platform Profile:              FULL_PROFILE
  Platform Version:              OpenCL 1.2 LINUX
  Platform Name:                 Intel(R) OpenCL
  Platform Vendor:               Intel(R) Corporation
  Platform Extensions:               cl_khr_icd cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_khr_spir cl_intel_exec_by_local_thread cl_khr_depth_images cl_khr_3d_image_writes cl_khr_fp64