5 Replies Latest reply on Jun 26, 2014 6:45 AM by dipak

    Couldn't get work OpenCL in my machine


      Hi to all,

      I have a dell computer with Debian wheezy on it. I've installed fglrx from repositories and the AMDAPP from the AMD website.

      As you can see, I'm running the proprietary drivers right now and I thought OpenCL shou.d have to work.


      $ glxinfo | grep render

      direct rendering: Yes

      OpenGL renderer string: AMD Radeon HD 7400M Series

          GL_NV_conditional_render, GL_NV_copy_depth_to_color, GL_NV_copy_image,

      But, when I launch my test code, that is what I get:

      $ ./example-0

      Warning: CL Wrapper running in debug mode


        [0] AMD Accelerated Parallel Processing - Advanced Micro Devices, Inc. (OpenCL 1.2 AMD-APP (1113.2))

      Choose a platform: 0

      AVAILABLE DEVICES(s) for current platform:

        [0] Intel(R) Core(TM) i3-2350M CPU @ 2.30GHz - GenuineIntel (OpenCL 1.2 AMD-APP (1113.2))

      Choose a device: 



      I don't understand why my radeon video card is not detected as valid device.

      Thank you in advance for any help

        • Re: Couldn't get work OpenCL in my machine


          Please check the "device_type" option when listing the available devices [clGetDeviceIDs]? It should be either CL_DEVICE_TYPE_GPU or CL_DEVICE_TYPE_ALL to access all available GPUs.



            • Re: Couldn't get work OpenCL in my machine

              It is already _ALL. I show you some gdb dump


              Breakpoint 1, clwGetDeviceList (platform=0x0, n=0x7fffffffddb4) at cl_wrapper.c:511

              511 __OpenCLLatestError = clGetDeviceIDs(currentPlatform,CL_DEVICE_TYPE_ALL,0,NULL,&length);

              (gdb) n

              513 list = (cl_device_id*)malloc(length*sizeof(cl_device_id));

              (gdb) p length

              $1 = 1


              As you can see, length var is set by clGetDeviceIDs at 1.

                • Re: Couldn't get work OpenCL in my machine

                  Yes,  it seems your OpenCL run-time is unable to detect the GPU device. Are the "clinfo" and "fglrxinfo" commands able to list the GPU device correctly?



                    • Re: Couldn't get work OpenCL in my machine

                      clinfo couldnt find the GPU, even if fglrxinfo does


                      $ clinfo

                      Number of platforms: 1

                        Platform Profile: FULL_PROFILE

                        Platform Version: OpenCL 1.2 AMD-APP (1113.2)

                        Platform Name: AMD Accelerated Parallel Processing

                        Platform Vendor: Advanced Micro Devices, Inc.

                        Platform Extensions: cl_khr_icd cl_amd_event_callback cl_amd_offline_devices





                        Platform Name: AMD Accelerated Parallel Processing

                      Number of devices: 1

                        Device Type: CL_DEVICE_TYPE_CPU

                        Vendor ID: 1002h

                        Board name: 

                        Max compute units: 4

                        Max work items dimensions: 3

                          Max work items[0]: 1024

                          Max work items[1]: 1024

                          Max work items[2]: 1024

                        Max work group size: 1024

                        Preferred vector width char: 16

                        Preferred vector width short: 8

                        Preferred vector width int: 4

                        Preferred vector width long: 2

                        Preferred vector width float: 8

                        Preferred vector width double: 4

                        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: 2300Mhz

                        Address bits: 64

                        Max memory allocation: 1944346624

                        Image support: Yes

                        Max number of images read arguments: 128

                        Max number of images write arguments: 8

                        Max image 2D width: 8192

                        Max image 2D height: 8192

                        Max image 3D width: 2048

                        Max image 3D height: 2048

                        Max image 3D depth: 2048

                        Max samplers within kernel: 16

                        Max size of kernel argument: 4096

                        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: Yes

                          Round to +ve and infinity: Yes

                          IEEE754-2008 fused multiply-add: Yes

                        Cache type: Read/Write

                        Cache line size: 64

                        Cache size: 32768

                        Global memory size: 1944346624

                        Constant buffer size: 65536

                        Max number of constant args: 8

                        Local memory type: Global

                        Local memory size: 32768

                        Kernel Preferred work group size multiple: 1

                        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: No

                          Profiling : Yes

                        Platform ID: 0x00007fdf47d2a4e0

                        Name: Intel(R) Core(TM) i3-2350M CPU @ 2.30GHz

                        Vendor: GenuineIntel

                        Device OpenCL C version: OpenCL C 1.2

                        Driver version: 1113.2 (sse2,avx)

                        Profile: FULL_PROFILE

                        Version: OpenCL 1.2 AMD-APP (1113.2)

                        Extensions: cl_khr_fp64 cl_amd_fp64 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_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_gl_sharing cl_ext_device_fission cl_amd_device_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_media_ops cl_amd_popcnt


                      $ fglrxinfo

                      display:   screen: 0

                      OpenGL vendor string: Advanced Micro Devices, Inc.

                      OpenGL renderer string: AMD Radeon HD 7400M Series

                      OpenGL version string: 4.2.11762 Compatibility Profile Context



                      I looked a bit around and I guess that something is interfering with the integrated intel graphics. Is it possible that? If it is so, how can I disable it or forcing cl to detect the gpu anyway?!

                        • Re: Couldn't get work OpenCL in my machine


                          Thanks for sharing these information. That is reason the clGetDeviceIDs was unable to detect the GPU.

                          I don't know whether your assumption is correct or not, or how to exactly solve the problem. I would suggest you to re-install the driver once again and check whether the problem solves or not. If still persists, I can forward this issue to concerned team.

                          Also, there is another forum called AMD Support and Game Forums (for hardware and driver support) where you can post your query.