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

AlterEtch
Beginner
11,520 Views

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

0 Kudos
1 Solution
Ben_A_Intel
Employee
11,520 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

5 Replies
Ben_A_Intel
Employee
11,521 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!

Kevin97
Beginner
5,156 Views

Hi Ben,

first I have to thank you for your article and code samples!

 

I am having a similar issue installing Intel-compute-runtime (NEO).

I installed it as the release page suggests:

 

wget https://github.com/intel/compute-runtime/releases/download/21.27.20266/intel-gmmlib_21.2.1_amd64.deb
wget https://github.com/intel/intel-graphics-compiler/releases/download/igc-1.0.7862/intel-igc-core_1.0.7862_amd64.deb
wget https://github.com/intel/intel-graphics-compiler/releases/download/igc-1.0.7862/intel-igc-opencl_1.0.7862_amd64.deb
wget https://github.com/intel/compute-runtime/releases/download/21.27.20266/intel-opencl_21.27.20266_amd64.deb
wget https://github.com/intel/compute-runtime/releases/download/21.27.20266/intel-ocloc_21.27.20266_amd64.deb
wget https://github.com/intel/compute-runtime/releases/download/21.27.20266/intel-level-zero-gpu_1.1.20266_amd64.deb
sudo dpkg -i *.deb

 

 

"/etc/OpenCL/vendors/intel.icd" does say "/usr/local/lib/intel-opencl/libigdrcl.so".

Under /usr/local/lib:

 

drwxr-xr-x     - root root   1 Jul 17:13  igc/
drwxr-xr-x     - clli clli   1 Jul 17:13  intel-opencl/
lrwxrwxrwx    13 root root   6 Jun  3:32  libiga64.so -> libiga64.so.1
lrwxrwxrwx    20 root root   6 Jun  3:32  libiga64.so.1 -> libiga64.so.1.0.7683
.rw-r--r--  2.0M root root   6 Jun  3:32  libiga64.so.1.0.7683
lrwxrwxrwx    11 root root   6 Jun  3:32  libigc.so -> libigc.so.1
lrwxrwxrwx    18 root root   6 Jun  3:32  libigc.so.1 -> libigc.so.1.0.7683
.rw-r--r--   63M root root   6 Jun  3:32  libigc.so.1.0.7683
lrwxrwxrwx    14 root root   6 Jun  3:32  libigdfcl.so -> libigdfcl.so.1
lrwxrwxrwx    21 root root   6 Jun  3:32  libigdfcl.so.1 -> libigdfcl.so.1.0.7683
.rw-r--r--  1.6M root root   6 Jun  3:32  libigdfcl.so.1.0.7683
lrwxrwxrwx    22 clli clli   6 May 19:01  libigdgmm.so.11 -> libigdgmm.so.11.3.1111
.rw-r--r--  537k clli clli  14 Jun 16:15  libigdgmm.so.11.3.1111
.rwxr-xr-x  692k clli clli  14 Jun 16:16  libocloc.so*
lrwxrwxrwx    21 root root   6 Jun  3:32  libopencl-clang.so -> libopencl-clang.so.10
.rw-r--r--  113M root root   8 Dec  2020  libopencl-clang.so.10
.rw-r--r--   27M root root   6 Jun  3:31  libSPIRVDLL.so
lrwxrwxrwx    34 root root  25 Feb  2020  libz3.so -> /usr/lib/x86_64-linux-gnu/libz3.so
lrwxrwxrwx    28 clli clli  11 Jun  4:42  libze_intel_gpu.so.1 -> libze_intel_gpu.so.1.1.20098
.rwxr-xr-x  5.4M clli clli  14 Jun 16:16  libze_intel_gpu.so.1.1.20098*

 

Looks like everything is in place.

 

However, clinfo only shows Nvidia OpenCL.

What lshw says:

 

❯ lshw -C video
WARNING: you should run this program as super-user.
  *-display
       description: VGA compatible controller
       product: GP102 [GeForce GTX 1080 Ti]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:16 memory:a3000000-a3ffffff memory:90000000-9fffffff memory:a0000000-a1ffffff ioport:3000(size=128) memory:c0000-dffff
  *-display
       description: Display controller
       product: UHD Graphics 630 (Desktop 9 Series)
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 02
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list
       configuration: driver=i915 latency=0
       resources: irq:130 memory:a2000000-a2ffffff memory:80000000-8fffffff ioport:4000(size=64)
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.

 

lspci:

 

00:00.0 Host bridge: Intel Corporation 8th Gen Core 8-core Desktop Processor Host Bridge/DRAM Registers [Coffee Lake S] (rev 0d)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 0d)
00:02.0 Display controller: Intel Corporation UHD Graphics 630 (Desktop 9 Series) (rev 02)
00:14.0 USB controller: Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host Controller (rev 10)
00:14.2 RAM memory: Intel Corporation Cannon Lake PCH Shared SRAM (rev 10)
00:16.0 Communication controller: Intel Corporation Cannon Lake PCH HECI Controller (rev 10)
00:17.0 RAID bus controller: Intel Corporation SATA Controller [RAID mode] (rev 10)
00:1b.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #17 (rev f0)
00:1c.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #1 (rev f0)
00:1d.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port #9 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Z390 Chipset LPC/eSPI Controller (rev 10)
00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
00:1f.4 SMBus: Intel Corporation Cannon Lake PCH SMBus Controller (rev 10)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Lake PCH SPI Controller (rev 10)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (7) I219-V (rev 10)
01:00.0 VGA compatible controller: NVIDIA Corporation GP102 [GeForce GTX 1080 Ti] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GP102 HDMI Audio Controller (rev a1)

 

 

Part of strace of clinfo that I deem relevant (thank you for your article again!):

Looks like the ICD loader did find "libigdrcl.so" and "libigdgmm.so.11" through "intel.icd".

 

openat(AT_FDCWD, "/etc/OpenCL/vendors/intel.icd", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=41, ...}) = 0
fstat(4, {st_mode=S_IFREG|0644, st_size=41, ...}) = 0
lseek(4, 0, SEEK_SET)                   = 0
read(4, "/usr/local/lib/intel-opencl/libi"..., 41) = 41
lseek(4, 41, SEEK_SET)                  = 41
openat(AT_FDCWD, "/usr/local/lib/intel-opencl/libigdrcl.so", O_RDONLY|O_CLOEXEC) = 10
read(10, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\346\2\0\0\0\0\0"..., 832) = 832
fstat(10, {st_mode=S_IFREG|0755, st_size=6204016, ...}) = 0
mmap(NULL, 8798672, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 10, 0) = 0x7f83b7b8d000
mprotect(0x7f83b8049000, 2093056, PROT_NONE) = 0
mmap(0x7f83b8248000, 1245184, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 10, 0x4bb000) = 0x7f83b8248000
mmap(0x7f83b8378000, 496080, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f83b8378000
close(10)                               = 0
openat(AT_FDCWD, "/home/pychang/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "tls/haswell/x86_64/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "tls/haswell/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "tls/x86_64/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "tls/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "haswell/x86_64/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "haswell/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "x86_64/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/home/pychang/.llvm-10.0.0-release/lib/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 10
fstat(10, {st_mode=S_IFREG|0644, st_size=77151, ...}) = 0
mmap(NULL, 77151, PROT_READ, MAP_PRIVATE, 10, 0) = 0x7f83c14b0000
close(10)                               = 0
openat(AT_FDCWD, "/usr/local/lib/libigdgmm.so.11", O_RDONLY|O_CLOEXEC) = 10
read(10, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360p\0\0\0\0\0\0"..., 832) = 832
fstat(10, {st_mode=S_IFREG|0644, st_size=537920, ...}) = 0
mmap(NULL, 2633088, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 10, 0) = 0x7f83b790a000
mprotect(0x7f83b7988000, 2097152, PROT_NONE) = 0
mmap(0x7f83b7b88000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 10, 0x7e000) = 0x7f83b7b88000
close(10)

 

The ICD loader is "/usr/local/cuda-10.2/targets/x86_64-linux/lib/libOpenCL.so.1".

I tried using LD_LIBRARY_PATH to force it to use Khronos ICD loader, but gained no luck.

Could it be iGPU not being VGA compatible controller?

Ben_A_Intel
Employee
5,096 Views

Hi Kevin,


first I have to thank you for your article and code samples!

You're very welcome, I'm glad they are useful!

I don't see anything obviously wrong in the information you have provided.

One easy thing to check is:  Is your user in the "video" group or otherwise have access to /dev/dri/renderD*?  See:

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

If so, some next things that would be helpful to know are:

  • What distro are you using and what is your kernel version?
  • Do you have your display connected to the integrated GPU or the discrete GPU (or both)?
  • Is this an "optimus" system?

The ICD loader is "/usr/local/cuda-10.2/targets/x86_64-linux/lib/libOpenCL.so.1".

I tried using LD_LIBRARY_PATH to force it to use Khronos ICD loader, but gained no luck.


This is probably fine, at least for now.  There could be an issue using the latest OpenCL features if this is an older ICD loader, but it shouldn't cause an issue enumerating OpenCL platforms and devices.

Could it be iGPU not being VGA compatible controller?


I don't think so, but just in case, it'd be worth taking a look through your BIOS to see if there is anything related to keeping the iGPU enabled when a dGPU is installed.

Good luck!

AlterEtch
Beginner
11,521 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
11,521 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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