Ubuntu version of OpenCL

Hi Polar01,

1. Download the Intel SDK for OpenCL Applications from Intel's web site (http://software.intel.com/en-us/articles/vcsource-tools-opencl-sdk/). After downloading, you will end with a .tgz file with an RPM inside (crazy, I know). In my case, the file is namedintel_sdk_for_ocl_applications_2012_x64.tgz.
2. Extract the RPM from the .tgz file:
   $ tar zxvf intel_sdk_for_ocl_applications_2012_x64.tgz
   This will extract the intel_ocl_sdk_2012_x64.rpm file.
3. Convert the RPM file to .deb format and install:
   $ sudo apt-get install -y rpm alien libnuma1    # In case you don't have these packages $ fakeroot alien --to-deb intel_ocl_sdk_2012_x64.rpm $ sudo dpkg -i intel-ocl-sdk_2.0-31361_amd64.deb
4. Now the SDK and libraries will be installed to /usr/lib64, while Ubuntu expects them to be in /usr/lib. No problem, just make a symlink and update the library cache:
   $ sudo ln -s /usr/lib64/libOpenCL.so /usr/lib/libOpenCL.so $ sudo ldconfig

That's all! OpenCL should be installed now.

Hi,

We hear your requests and taking it into considerations. We are not discussing future products releases in this forum, yet all feedback and asks are taken into account.

Thanks for posting your requirement here.

Arnon

OpenCL SDK Product Manager

Hello Arnon,

I have a Ubuntu 12.04 and from this link (http://software.intel.com/en-us/vcsource/tools/opencl) it looks like i should be using the Version XE 2013. The notes for this version say it has been tested on xeon processors. I do have a i5 with integrated Intel HD graphics on my machine. So which version should i install for this configuration (i5 with integrated graphics with ubuntu 12.04)? Please advise.

Thanks

Renga

Here are some steps I used with Ubuntu 13.04 and the new multi-package distribution Intel® SDK for OpenCL* Applications XE 2013:

Download the 64-bit distribution from Intel: intel_sdk_for_ocl_applications_2013_xe_sdk_3.0.67279_x64.tgz
Download the Intel public key.  I had trouble finding it, but googling the filename pointed me to the correct page at Intel. Intel-E901-172E-EF96-900F-B8E1-4184-D7BE-0E73-F789-186F.pub

$ sudo apt-get install -y rpm alien libnuma1

$ sudo rpm --import Intel-E901-172E-EF96-900F-B8E1-4184-D7BE-0E73-F789-186F.pub

$ tar -xvf intel_sdk_for_ocl_applications_2013_xe_sdk_3.0.67279_x64.tgz
$ cd intel_sdk_for_ocl_applications_2013_xe_sdk_3.0.67279_x64/

$ fakeroot alien --to-deb opencl-1.2-base-3.0.67279-1.x86_64.rpm
$ fakeroot alien --to-deb opencl-1.2-intel-cpu-3.0.67279-1.x86_64.rpm

$ sudo dpkg -i opencl-1.2-base_3.0.67279-2_amd64.deb
$ sudo dpkg -i opencl-1.2-intel-cpu_3.0.67279-2_amd64.deb

The above installs the library files and intallable client driver registration in /opt/intel/opencl-1.2-3.0.67279.
Two more steps were needed to run an OpenCL program.

Add library to search path:
$ sudo touch /etc/ld.so.conf.d/intelOpenCL.conf
Edit this file, add the line:
/opt/intel/opencl-1.2-3.0.67279/lib64

Link to the intel icd file in the expected location:
$ sudo ln /opt/intel/opencl-1.2-3.0.67279/etc/intel64.icd /etc/OpenCL/vendors/intel64.icd
$ sudo ldconfig

At this point I could run an existing application.  If doing developmnent, install the developer headers and tools:

$ fakeroot alien --to-deb opencl-1.2-devel-3.0.67279-1.x86_64.rpm
$ fakeroot alien --to-deb opencl-1.2-intel-devel-3.0.67279-1.x86_64.rpm

$ sudo dpkg -i opencl-1.2-devel_3.0.67279-2_amd64.deb
$ sudo dpkg -i opencl-1.2-intel-devel_3.0.67279-2_amd64.deb

It is worth noting the include path for headers is: /opt/intel/opencl-1.2-3.0.67279/include
The linking path for libraries is: /opt/intel/opencl-1.2-3.0.67279/lib64
The developer tool binaries are installed in: /opt/intel/opencl-1.2-3.0.67279/bin

Apologies for the probably-obvious question: on this page:

http://software.intel.com/en-us/vcsource/tools/opencl

It says OpenCL SDK is available for " Ubuntu* 12.04 (Host²) "  - does that imply you can develop on that platform, but cannot execute?

Thanks -

Michael

Is there an available OpenCL sdk somewhere at Intel.  I've been playing around with the page where I keep getting sent, and all I can get is IDEs etc... 

I'm running Ununtu 14.10 on an Intel Xeon(R) ES-2630

Thanks,

Mitch

Mitch,

You can download OpenCL runtime for Ubuntu here: https://software.intel.com/en-us/articles/opencl-drivers#ubuntu64

And Intel® Code Builder for OpenCL™ API 2015 for Ubuntu* (64-bit) here  https://software.intel.com/en-us/articles/intel-code-builder-for-opencl-api .

That's about it.

Hello Intel,

i want to install OpenCLTM Runtime 15.1 for Intel® CoreTM and Intel® Xeon® Processors , on 14.04.1-Ubuntu  (64 bit) .

My system specification are :Model Intel (R)core (TM) i5-2540 M CPU @2.60 GHz, Ubuntu 64 bit , GNU/Linux 2.6.24

In release notes written that supported Operating Systems " Ubuntu 12.04  and 14.04 . But when i run the install_GUI , it show the message  operating system not supported.

Please Help me , i am new on  intel  OpenCL  sdk .

Reagds,

Hello,

The OpenCL CPU runtime for Ubuntu OS comes with Intel OpenCL Code Builder for Ubuntu package (https://software.intel.com/en-us/articles/opencl-drivers#ubuntu64)

The version you're trying to install is supported on SLES and RHEL operating systems only.

We'll modify the release notes to better clarify it.  

Thanks,

Uri

Hallo Uri,

Thank you for response,

i tried to install your given link "Intel OpenCL Code Builder for Ubuntu package (https://software.intel.com/en-us/articles/opencl-drivers#ubuntu64)" , but still give the message in installing Mode " Unsupported Operating System,  Does Intel Code builder for ubuntu support  only 12.04 LTE  OS.

i am try to install  on 14.04.1-Ubuntu  (64 bit) .

1) extract the tar IntelOpenCL SDK.

2) run the install_GUI .

("Message : Unsupported OS Version ")

What should i do ,  should i change my ubuntu version  or have intel any solution for compatibility with new version of ubuntu (14.04.1-Ubuntu  (64 bit) ).

it will be the great help  for me ,if you advise me to install the intelOpenCL SDK   steps on my system.

Best Regards,

Zeshan

The following steps worked for me on Ubuntu 15.04 based on Noah's instructions above:

$ sudo apt-get install -y rpm alien libnuma1

$ tar -xvf intel_code_builder_for_opencl_2015_ubuntu_5.0.0.43_x64.tgz
$ cd intel_code_builder_for_opencl_2015_ubuntu_5.0.0.43_x64

$ sudo rpm --import PUBLIC_KEY.PUB

$ cd rpm

$ fakeroot alien --to-deb opencl-1.2-base-5.0.0.43-1.x86_64.rpm
$ fakeroot alien --to-deb opencl-1.2-intel-cpu-5.0.0.43-1.x86_64.rpm

$ sudo dpkg -i opencl-1.2-base_5.0.0.43-2_amd64.deb
$ sudo dpkg -i opencl-1.2-intel-cpu_5.0.0.43-2_amd64.deb

The above installs the library files and installable client driver registration in /opt/intel/opencl-1.2-5.0.0.43.
Two more steps were needed to run an OpenCL program.

Add library to search path:
$ sudo nano /etc/ld.so.conf.d/intelOpenCL.conf
Add the line:
/opt/intel/opencl-1.2-5.0.0.43/lib64

Link to the intel icd file in the expected location:
$ sudo ln /opt/intel/opencl-1.2-5.0.0.43/etc/intel64.icd /etc/OpenCL/vendors/intel64.icd
$ sudo ldconfig

$ sudo clinfo
Number of platforms 2
Platform Name NVIDIA CUDA
Platform Vendor NVIDIA Corporation
Platform Version OpenCL 1.1 CUDA 6.5.45
Platform Profile FULL_PROFILE
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 Extensions function suffix NV

Platform Name Intel(R) OpenCL
Platform Vendor Intel(R) Corporation
Platform Version OpenCL 1.2 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
Platform Extensions function suffix INTEL

I definitely have problems with the newest version intel_sdk_for_opencl_2016_ubuntu_6.0.0.1049_x64.
it seems that when it comes to "Link to the intel icd file in the expected location:" there is no file /opet/intel/opencl*/etc/*icd to link.

jaky@jaky-Satellite-S55-A:/opt/intel$ ls
intel-opencl-1.2-6.0.0.1049  ism                    opencl-1.2-sdk-6.0.0.1049
intel_sdp_products.db        opencl-1.2-6.0.0.1049
jaky@jaky-Satellite-S55-A:/opt/intel$ ls opencl-1.2-6.0.0.1049/
lib64
jaky@jaky-Satellite-S55-A:/opt/intel$ ls opencl-1.2-6.0.0.1049/lib64/
libOpenCL.so  libOpenCL.so.1  libOpenCL.so.1.2
jaky@jaky-Satellite-S55-A:/opt/intel$ 

Is there any detailed guide for this specific version to follow? 
Is there a way to clean the installation to start from the scratch?
Thank you in advance.
Jacopo

Hi,

I am also facing the same problem as Jacopo. I cannot find icd files and also in rpm folder I cannot find opencl-1.2-intel-cpu-*.rpm. Can anyone help me how to solve this problem?

Regards,

Nishma Laitonjam

Hi Nishma,

You will have to install a CPU runtime for Ubuntu separately: https://software.intel.com/en-us/articles/opencl-drivers#16.1ubuntu64 .

I installed GPU runtime that came with the SDK first, then installed the CPU runtime above, then set LD_LIBRARY_PATH to point to the location of CPU OpenCL runtime dlls, and then I can see both CPU and GPU devices.

Hi Robert,

Thanks for your help, now I can find .icd file. But when I run (sudo clinfo), I got the following error :-
modprobe: ERROR: could not insert 'fglrx': No such device
Error! Fail to load fglrx kernel module! Maybe you can switch to root user to load kernel module directly
modprobe: ERROR: could not insert 'fglrx': No such device
Error! Fail to load fglrx kernel module! Maybe you can switch to root user to load kernel module directly
modprobe: ERROR: could not insert 'fglrx': No such device
Error! Fail to load fglrx kernel module! Maybe you can switch to root user to load kernel module directly

I am very grateful, if you can help me with this also. Thank you for your time.

Regards,

Nishma Laitonjam

Hi Nishma,

I was unable to run clinfo either: different error though. Try to get Intel samples for Linux https://software.intel.com/en-us/intel-opencl-support/code-samples and build the CapsBasic one. You can also try to get it here: https://software.intel.com/en-us/articles/caps-basic - build it and run it and let me know if that worked for you. Make sure to add /opt/intel/OpenCL-1.2-5.2.0.10002/lib64 to your LD_LIBRARY_PATH.

Let me know how it goes.

Hi Robert,

When I run ./capsbasic, I get the following message

modprobe: ERROR: could not insert 'fglrx_updates': No such device
Error: Fail to load fglrx kernel module!
Error! Fail to load fglrx kernel module! Maybe you can switch to root user to load kernel module directly
modprobe: ERROR: could not insert 'fglrx_updates': No such device
Error: Fail to load fglrx kernel module!
Error! Fail to load fglrx kernel module! Maybe you can switch to root user to load kernel module directly
modprobe: ERROR: could not insert 'fglrx_updates': No such device
Error: Fail to load fglrx kernel module!
Error! Fail to load fglrx kernel module! Maybe you can switch to root user to load kernel module directly
Number of available platforms: 2
Platform names:
    [0] Intel(R) OpenCL [Selected]
    [1] AMD Accelerated Parallel Processing
Number of devices available for each type:
    CL_DEVICE_TYPE_CPU: 1
    CL_DEVICE_TYPE_GPU: 0
    CL_DEVICE_TYPE_ACCELERATOR: 0

*** Detailed information for each device ***

CL_DEVICE_TYPE_CPU[0]
    CL_DEVICE_NAME: Intel(R) Core(TM) i5 CPU       M 540  @ 2.53GHz
    CL_DEVICE_AVAILABLE: 1
    CL_DEVICE_VENDOR: Intel(R) Corporation
    CL_DEVICE_PROFILE: FULL_PROFILE
    CL_DEVICE_VERSION: OpenCL 1.2 (Build 10002)
    CL_DRIVER_VERSION: 1.2.0.10002
    CL_DEVICE_OPENCL_C_VERSION: OpenCL C 1.2
    CL_DEVICE_MAX_COMPUTE_UNITS: 4
    CL_DEVICE_MAX_CLOCK_FREQUENCY: 2530
    CL_DEVICE_MAX_WORK_GROUP_SIZE: 8192
    CL_DEVICE_ADDRESS_BITS: 64
    CL_DEVICE_MEM_BASE_ADDR_ALIGN: 1024
    CL_DEVICE_MAX_MEM_ALLOC_SIZE: 2056365056
    CL_DEVICE_GLOBAL_MEM_SIZE: 8225460224
    CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE: 131072
    CL_DEVICE_GLOBAL_MEM_CACHE_SIZE: 262144
    CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE: 64
    CL_DEVICE_LOCAL_MEM_SIZE: 32768
    CL_DEVICE_PROFILING_TIMER_RESOLUTION: 1
    CL_DEVICE_IMAGE_SUPPORT: 1
    CL_DEVICE_ERROR_CORRECTION_SUPPORT: 0
    CL_DEVICE_HOST_UNIFIED_MEMORY: 1
    CL_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_DEVICE_PREFERRED_VECTOR_WIDTH_INT: 1
    CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG: 1
    CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT: 1
    CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE: 1
    CL_DEVICE_NATIVE_VECTOR_WIDTH_INT: 4
    CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG: 2
    CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT: 4
    CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE: 2

Best Regards,

Nishma

Hi Nishma,

1. Could you run any other of the Intel samples? Do they run on the CPU device, and you just get the error messages in the output, as above?

2. Looks like fglrx is giving you trouble (https://en.wikipedia.org/wiki/AMD_Radeon_Software_Crimson#Linux ), but the Intel CPU driver is actually doing its thing. Somehow AMD driver does not play well with our driver or vice versa.

I have no way to replicate your hardware configurations. One thing you could try is to make sure that LD_LIBRARY_PATH, in addition to pointing to Intel OpenCL libraries, points to AMD ones as well. Check this out too https://elrepo.org/bugs/view.php?id=457

Hi Robert,

I uninstall AMD SDK and now no error is generated with clinfo and I got the following

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_depth_images cl_khr_3d_image_writes cl_intel_exec_by_local_thread cl_khr_spir cl_khr_fp64

  Platform Name:                 Intel(R) OpenCL
Number of devices:                 1
  Device Type:                     CL_DEVICE_TYPE_CPU
  Vendor ID:                     8086h
  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:             4
  Native vector width double:             2
  Max clock frequency:                 2530Mhz
  Address bits:                     64
  Max memory allocation:             2056365056
  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:                 8225460224
  Constant buffer size:                 131072
  Max number of constant args:             480
  Local memory type:                 Global
  Local memory size:                 32768
  Kernel Preferred work group size multiple:     128
  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 on Host properties:                
    Out-of-Order:                 Yes
    Profiling :                     Yes
  Platform ID:                     0x1c9ceb0
  Name:                         Intel(R) Core(TM) i5 CPU       M 540  @ 2.53GHz
  Vendor:                     Intel(R) Corporation
  Device OpenCL C version:             OpenCL C 1.2
  Driver version:                 1.2.0.10002
  Profile:                     FULL_PROFILE
  Version:                     OpenCL 1.2 (Build 10002)
  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

Hi Nishma,

One thing I am curious about: if you reinstall the AMD SDK, does that fix the problem and do you see the GPU device as well?

Hi Robert,

I tried running GEMM and bitonic sort and it doesn't give error now. They use CPU. Does this means I have install OpenCL correctly? Could you please tell me how to run samples using GPU?

Best Regards,

Nishma Laitonjam

Hi Nishma,

Yes, you installed the CPU OpenCL runtime correctly. You could try to reinstall AMD SDK and see if you could get your GPU OpenCL device back. Your integrated GPU is much too old, so we don't have an OpenCL runtime that supports it.

Hi Tata,

We don't support a GPU driver for Sandy Bridge. Sorry!

Hi Robert,

My environment is ubuntu14.04 64-bit and Intel® Core™ i7-4770 CPU @ 3.40GHz × 8. 
I've download and installed the Intel opencl backend from https://software.intel.com/en-us/articles/opencl-drivers#latest_linux_driver. 

Also I installed the clinfo:  $ sudo apt-get install clinfo

And then I ran clinfo: $ sudo clinfo

But it crashed:

terminate called after throwing an instance of 'unsigned long'

Could you help on it?

Best Regards,

Kris

Hello,

I have the same environment and did exactly what is recommended in https://software.intel.com/en-us/node/671831 after installation of Intel OpenCL from https://software.intel.com/en-us/intel-opencl/download. But, when invoking Eclipse Mars.2 I have messages kind of "Cannot get machine/platform/device list. Failed to initialize code builder API." What may be the problem?

Thanks

Hi Robert,

I have a similar problem to Vitali K. I am using Eclipse Neon and I also get messages of the type "Cannot get machine/platform/device list. Failed to initialize code builder API." The command line version of ioc64 seems to work.

Thanks,

Nik

Quote:

Robert I. (Intel) wrote:

Looking for more info on eclipse.  Hope to get back to you soon.

Hi,

I am trying to install intel SDK for openCL on a virtual machine. when I am trying to install opencl runtime env then it is giving output as "CPU is not supported". I complied the matrix multiplication program. It is compiling with some warning and creating the executable file. But when I am running the executable then it is giving  error as follows:

./GEMM: error while loading shared libraries: libOpenCL.so.1: cannot open shared object file: No such file or directory

UPDATE:

now I fixed the path problem I think. A new error is coming.

root@VM1:/home/sudiptavm/workvm/codeSamples/withOpenCL/matrix_mult/GEMM# ./GEMM
Platforms (1):
    [0] Intel(R) OpenCL [Selected]
Devices (1):
    [0] QEMU Virtual CPU version 2.2.0 [Selected]

[ ERROR ] Sample application specific error: OpenCL error CL_DEVICE_NOT_AVAILABLE happened in file ../common/oclobject.cpp at line 447.

How can I solve it?

note: I installed OpenCL in the host machine which has Intel(R) Xeon(R) CPU E31280 @ 3.50GHz

With regards,

Sudipta

What do you see with the system analyzer?  https://software.intel.com/en-us/articles/mss-sys-analyzer-linux

You can also see more about how OpenCL initialization is handling this environment  with the Platform/Device Capabilities Viewer Sample.

Hi ,

I am  trying to install intel opencl sdk on CentOS 7.2 core , but while installing it is giving the error   GPU not supported 

I am using intel i5 core on x86  and os is here on Vertual mechine Cent Os 7.2 core   , 

can anyone help me on this 

thank u

while installing the intel opencl sdk on x86  intel i5 core  and os in vertual machine is  CentOS  7.2 core 

I am getting this error  , 

but I have installed  that dkms packages and java 8 also installed  and 3D graphics option in VM ware also done 

but again instalation time it is giving the same error  i.e  GPU not supported 

need help , can anyone help on this issue 

Я получаю эту ошибку, 

но я установил, что dkms 

но опять же время установки дает ту же ошибку, то есть GPU не поддерживается 

нужна помощь, может кто-нибудь помочь по этой проблеме 

I am getting this error  , 

but I have installed  that dkms 

but again instalation time it is giving the same error  i.e  GPU not supported 

need help , can anyone help on this issue 

Hi TimurS,

Can you share what CPU SKU the system is on? What kernel the system is on?

For linux setup... please see these two pages:

https://software.intel.com/en-us/articles/sdk-for-opencl-gsg

https://software.intel.com/en-us/articles/sdk-for-opencl-2017-gsg-linux-os

-MichaelC

Hi, I am a new OCL dev trying to get everything off the ground so I can start playing with it.

I am running on an Inspiron prebuilt laptop running window 10 home, and operate in an Ubuntu 16.04.4 terminal.

When compiling through the C++ wrapper I get a large error string as follows:

/tmp/ccTKf6fE.o: In function `cl::detail::ReferenceHandler<_cl_device_id*>::release(_cl_device_id*)':                   oCLtest.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP13_cl_device_idE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP13_cl_device_idE7releaseES3_]+0x14): undefined reference to `clReleaseDevice'                                                 /tmp/ccTKf6fE.o: In function `cl::detail::ReferenceHandler<_cl_context*>::release(_cl_context*)':                       oCLtest.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3_]+0x14): undefined reference to `clReleaseContext'                                                    /tmp/ccTKf6fE.o: In function `cl::detail::ReferenceHandler<_cl_command_queue*>::release(_cl_command_queue*)':           oCLtest.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3_]+0x14): undefined reference to `clReleaseCommandQueue'                                   collect2: error: ld returned 1 exit status     

after the program defaults to OpenCL2.0.

I've done some poking around and believe that I haven't installed the SDK properly, or at the very least haven't linked it correctly, though I'm not familiar enough with bash commands to make any sense of what I'm supposed to do through it. Thanks in advance.

Hi TraceV,

Can you share your linker command? If your ocltest.cpp source is appropriate for sharing... can you start a new thread on the forum and attach it?

Edits:

Thanks for the comment. This looks like the OpenCL library isn't being linked in properly.

On Linux OS the linker will need to see libOpenCL.so... On Windows OS the linker will need to see OpenCL.lib... both are available from the Intel SDK for OpenCL Applications 2017 and 2019 beta respectively.

Adding -lOpenCL -L<path to libOpenCL.so> may get you across the finish line.

Also... Look out for deprecated functions when using OpenCL 2.0 which may not link as expected without the usage of macros...  Some functions only exist for OpenCL 2.0 while some exist in 1.2 but are sometimes exposed with #define CL_USE_DEPRECATED_OPENCL_1_2_APIS... Examples that users evaluate may not specify which OpenCL version they expect, so a developer needs to consider tweaking the code in accordance with their platforms.

/Edits

Thanks for your interest,

-MichaelC