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AlterEtch
Beginner
5,703 Views

openCL on Ubuntu still can't detect my intel graphics platform after I install some relevant drivers

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I am learning OpenCL and configuring the environment right now.

My system is Ubuntu 18.04. The HW is Intel® Core™ i7-8700K with GeForce GTX 1080 Ti.

I download intel_sdk_for_opencl_applications_2020.0.270.tar.gz from Intel® SDK for OpenCL™ Applications, extract it, run 

sudo ./install.sh

and then follow the GUI instruction to complete the installation.

Then, I install NEO from intel/compute-runtime by

mkdir neo
cd neo
wget https://github.com/intel/compute-runtime/releases/download/19.51.15145/intel-gmmlib_19.3.4_amd64.deb
wget https://github.com/intel/compute-runtime/releases/download/19.51.15145/intel-igc-core_1.0.3041_amd64...
wget https://github.com/intel/compute-runtime/releases/download/19.51.15145/intel-igc-opencl_1.0.3041_amd...
wget https://github.com/intel/compute-runtime/releases/download/19.51.15145/intel-opencl_19.51.15145_amd6...
wget https://github.com/intel/compute-runtime/releases/download/19.51.15145/intel-ocloc_19.51.15145_amd64...
sudo dpkg -i *.deb

I check the platform by clinfo which gives me the results:

Number of platforms                               2
  Platform Name                                   Intel(R) CPU Runtime for OpenCL(TM) Applications
  Platform Vendor                                 Intel(R) Corporation
  Platform Version                                OpenCL 2.1 LINUX
  Platform Profile                                FULL_PROFILE
  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_depth_images cl_khr_3d_image_writes cl_intel_exec_by_local_thread cl_khr_spir cl_khr_fp64 cl_khr_image2d_from_buffer cl_intel_vec_len_hint 
  Platform Host timer resolution                  1ns
  Platform Extensions function suffix             INTEL

  Platform Name                                   NVIDIA CUDA
  Platform Vendor                                 NVIDIA Corporation
  Platform Version                                OpenCL 1.2 CUDA 10.2.95
  Platform Profile                                FULL_PROFILE
  Platform Extensions                             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_fp64 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 cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics
  Platform Extensions function suffix             NV

  Platform Name                                   Intel(R) CPU Runtime for OpenCL(TM) Applications
Number of devices                                 1
  Device Name                                     Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
  Device Vendor                                   Intel(R) Corporation
  Device Vendor ID                                0x8086
  Device Version                                  OpenCL 2.1 (Build 0)
  Driver Version                                  18.1.0.0920
  Device OpenCL C Version                         OpenCL C 2.0 
  Device Type                                     CPU
  Device Profile                                  FULL_PROFILE
  Device Available                                Yes
  Compiler Available                              Yes
  Linker Available                                Yes
  Max compute units                               12
  Max clock frequency                             3700MHz
  Device Partition                                (core)
    Max number of sub-devices                     12
    Supported partition types                     by counts, equally, by names (Intel)
  Max work item dimensions                        3
  Max work item sizes                             8192x8192x8192
  Max work group size                             8192
  Preferred work group size multiple              128
  Max sub-groups per work group                   1
  Preferred / native vector sizes                 
    char                                                 1 / 32      
    short                                                1 / 16      
    int                                                  1 / 8       
    long                                                 1 / 4       
    half                                                 0 / 0        (n/a)
    float                                                1 / 8       
    double                                               1 / 4        (cl_khr_fp64)
  Half-precision Floating-point support           (n/a)
  Single-precision Floating-point support         (core)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 No
    Round to infinity                             No
    IEEE754-2008 fused multiply-add               No
    Support is emulated in software               No
    Correctly-rounded divide and sqrt operations  No
  Double-precision Floating-point support         (cl_khr_fp64)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
  Address bits                                    64, Little-Endian
  Global memory size                              42109607936 (39.22GiB)
  Error Correction support                        No
  Max memory allocation                           10527401984 (9.804GiB)
  Unified memory for Host and Device              Yes
  Shared Virtual Memory (SVM) capabilities        (core)
    Coarse-grained buffer sharing                 Yes
    Fine-grained buffer sharing                   Yes
    Fine-grained system sharing                   Yes
    Atomics                                       Yes
  Minimum alignment for any data type             128 bytes
  Alignment of base address                       1024 bits (128 bytes)
  Preferred alignment for atomics                 
    SVM                                           64 bytes
    Global                                        64 bytes
    Local                                         0 bytes
  Max size for global variable                    65536 (64KiB)
  Preferred total size of global vars             65536 (64KiB)
  Global Memory cache type                        Read/Write
  Global Memory cache size                        262144 (256KiB)
  Global Memory cache line size                   64 bytes
  Image support                                   Yes
    Max number of samplers per kernel             480
    Max size for 1D images from buffer            657962624 pixels
    Max 1D or 2D image array size                 2048 images
    Base address alignment for 2D image buffers   64 bytes
    Pitch alignment for 2D image buffers          64 pixels
    Max 2D image size                             16384x16384 pixels
    Max 3D image size                             2048x2048x2048 pixels
    Max number of read image args                 480
    Max number of write image args                480
    Max number of read/write image args           480
  Max number of pipe args                         16
  Max active pipe reservations                    21845
  Max pipe packet size                            1024
  Local memory type                               Global
  Local memory size                               32768 (32KiB)
  Max number of constant args                     480
  Max constant buffer size                        131072 (128KiB)
  Max size of kernel argument                     3840 (3.75KiB)
  Queue properties (on host)                      
    Out-of-order execution                        Yes
    Profiling                                     Yes
    Local thread execution (Intel)                Yes
  Queue properties (on device)                    
    Out-of-order execution                        Yes
    Profiling                                     Yes
    Preferred size                                4294967295 (4GiB)
    Max size                                      4294967295 (4GiB)
  Max queues on device                            4294967295
  Max events on device                            4294967295
  Prefer user sync for interop                    No
  Profiling timer resolution                      1ns
  Execution capabilities                          
    Run OpenCL kernels                            Yes
    Run native kernels                            Yes
    Sub-group independent forward progress        No
    IL version                                    SPIR-V_1.0
    SPIR versions                                 1.2
  printf() buffer size                            1048576 (1024KiB)
  Built-in kernels                                
  Device 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_depth_images cl_khr_3d_image_writes cl_intel_exec_by_local_thread cl_khr_spir cl_khr_fp64 cl_khr_image2d_from_buffer cl_intel_vec_len_hint 

  Platform Name                                   NVIDIA CUDA
Number of devices                                 1
  Device Name                                     GeForce GTX 1080 Ti
  Device Vendor                                   NVIDIA Corporation
  Device Vendor ID                                0x10de
  Device Version                                  OpenCL 1.2 CUDA
  Driver Version                                  440.33.01
  Device OpenCL C Version                         OpenCL C 1.2 
  Device Type                                     GPU
  Device Topology (NV)                            PCI-E, 01:00.0
  Device Profile                                  FULL_PROFILE
  Device Available                                Yes
  Compiler Available                              Yes
  Linker Available                                Yes
  Max compute units                               28
  Max clock frequency                             1645MHz
  Compute Capability (NV)                         6.1
  Device Partition                                (core)
    Max number of sub-devices                     1
    Supported partition types                     None
  Max work item dimensions                        3
  Max work item sizes                             1024x1024x64
  Max work group size                             1024
  Preferred work group size multiple              32
  Warp size (NV)                                  32
  Preferred / native vector sizes                 
    char                                                 1 / 1       
    short                                                1 / 1       
    int                                                  1 / 1       
    long                                                 1 / 1       
    half                                                 0 / 0        (n/a)
    float                                                1 / 1       
    double                                               1 / 1        (cl_khr_fp64)
  Half-precision Floating-point support           (n/a)
  Single-precision Floating-point support         (core)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
    Correctly-rounded divide and sqrt operations  Yes
  Double-precision Floating-point support         (cl_khr_fp64)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
  Address bits                                    64, Little-Endian
  Global memory size                              11718230016 (10.91GiB)
  Error Correction support                        No
  Max memory allocation                           2929557504 (2.728GiB)
  Unified memory for Host and Device              No
  Integrated memory (NV)                          No
  Minimum alignment for any data type             128 bytes
  Alignment of base address                       4096 bits (512 bytes)
  Global Memory cache type                        Read/Write
  Global Memory cache size                        1376256 (1.312MiB)
  Global Memory cache line size                   128 bytes
  Image support                                   Yes
    Max number of samplers per kernel             32
    Max size for 1D images from buffer            268435456 pixels
    Max 1D or 2D image array size                 2048 images
    Max 2D image size                             16384x32768 pixels
    Max 3D image size                             16384x16384x16384 pixels
    Max number of read image args                 256
    Max number of write image args                16
  Local memory type                               Local
  Local memory size                               49152 (48KiB)
  Registers per block (NV)                        65536
  Max number of constant args                     9
  Max constant buffer size                        65536 (64KiB)
  Max size of kernel argument                     4352 (4.25KiB)
  Queue properties                                
    Out-of-order execution                        Yes
    Profiling                                     Yes
  Prefer user sync for interop                    No
  Profiling timer resolution                      1000ns
  Execution capabilities                          
    Run OpenCL kernels                            Yes
    Run native kernels                            No
    Kernel execution timeout (NV)                 Yes
  Concurrent copy and kernel execution (NV)       Yes
    Number of async copy engines                  2
  printf() buffer size                            1048576 (1024KiB)
  Built-in kernels                                
  Device Extensions                               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_fp64 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 cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics

NULL platform behavior
  clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...)  No platform
  clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...)   No platform
  clCreateContext(NULL, ...) [default]            No platform
  clCreateContext(NULL, ...) [other]              Success [INTEL]
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT)  Success (1)
    Platform Name                                 Intel(R) CPU Runtime for OpenCL(TM) Applications
    Device Name                                   Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU)  Success (1)
    Platform Name                                 Intel(R) CPU Runtime for OpenCL(TM) Applications
    Device Name                                   Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL)  Success (1)
    Platform Name                                 Intel(R) CPU Runtime for OpenCL(TM) Applications
    Device Name                                   Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
	NOTE:	your OpenCL library only supports OpenCL 2.0,
		but some installed platforms support OpenCL 2.1.
		Programs using 2.1 features may crash
		or behave unexepectedly

By the way, I already install the CUDA through other channels. The result from clinfo doesn't detect Intel Graphics.

Also, I try sample code from Get Started with Intel® SDK for OpenCL™ Applications 2019 on Linux* OS with Training Sample.

The cpu version works well.

./CPUOpenCLProjectforLinux gives me

Selected device type is CL_DEVICE_TYPE_CPU
Number of available platforms: 2
Selected platform: Intel(R) CPU Runtime for OpenCL(TM) Applications
NDRange performance counter time 0.488000 ms.

while ./GPUOpenCLProjectforLinux gives me

Selected device type is CL_DEVICE_TYPE_GPU
Number of available platforms: 2
Selected platform: Intel(R) CPU Runtime for OpenCL(TM) Applications
clGetDeviceIDs() returned CL_DEVICE_NOT_FOUND for platform Intel(R) CPU Runtime for OpenCL(TM) Applications.
Error: Failed to find OpenCL platform.

Did I miss any procedure? Thanks

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1 Solution
Ben_A_Intel
Employee
5,703 Views

Hi AlterEtch,

I don't see any obvious missing steps, but here are a few additional things to try:

1) I wrote an article describing how OpenCL works on Linux that includes some troubleshooting tips that may be helpful:

https://github.com/bashbaug/OpenCLPapers/blob/master/OpenCLOnLinux.asciidoc#troubleshooting-opencl-o...

2) Since you also have a discrete GPU card, you may want to verify that your system keeps the integrated GPU enabled when a discrete GPU is installed.  If you run "lspci" do you see the integrated GPU?

3) If everything else looks OK, can you verify that your user is in the "video" group?  See:

https://github.com/intel/compute-runtime#installation-options

Thanks!

View solution in original post

3 Replies
Ben_A_Intel
Employee
5,704 Views

Hi AlterEtch,

I don't see any obvious missing steps, but here are a few additional things to try:

1) I wrote an article describing how OpenCL works on Linux that includes some troubleshooting tips that may be helpful:

https://github.com/bashbaug/OpenCLPapers/blob/master/OpenCLOnLinux.asciidoc#troubleshooting-opencl-o...

2) Since you also have a discrete GPU card, you may want to verify that your system keeps the integrated GPU enabled when a discrete GPU is installed.  If you run "lspci" do you see the integrated GPU?

3) If everything else looks OK, can you verify that your user is in the "video" group?  See:

https://github.com/intel/compute-runtime#installation-options

Thanks!

View solution in original post

AlterEtch
Beginner
5,703 Views

Hi Ben,

It seems my intel graphics is not enabled. I run `lspci | grep VGA`, getting the result of only NVIDIA. 

Then, I run `sudo prime-select intel` and reboot. But the result of `lspci | grep VGA` doesn't change at all.

I also try the same procedure on a laptop without dedicated GPU, and it works well. 

Now I need to find a way to enable the integrated GPU.

==========================

UPDATE:

Somehow all my HDMI cables are plugged into the dedicated GPU which make integrated GPU undetectable.

Now I can find three platform: intel cpu, intel gpu, and cuda.

 

Thanks.

Michael_C_Intel1
Moderator
5,703 Views

AlterEtch,

Glad the platforms are detected.

I checked with the Intel Graphics Compute Runtime Driver developers for some comment about the hardware configuration...

They suggested the possibility that the system vendor BIOS or EFI control could disable Intel Graphics Technology hardware if the display cable was not connected to it. This would cause the iGFX device to not be resolved by the Linux* OS at 'PCI bus as 00:02.0 VGA compatible controller', and not allow the corresponding i915 video driver to load. The OpenCL implementation for iGFX relies on this OS+Driver visibility.

Windows* OS systems are known to disable device resolution already as described in the 2020 developer sdk release notes page 9.

-MichaelC

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