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OpenCL

tuttoweb
Journeyman III

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

AVAILABLE PLATFORM(s):

  [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

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5 Replies
dipak
Staff
Staff

Re: Couldn't get work OpenCL in my machine

Hi,

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.

Regards,

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tuttoweb
Journeyman III

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.

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dipak
Staff
Staff

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?

Regards,

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tuttoweb
Journeyman III

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?!

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dipak
Staff
Staff

Re: Couldn't get work OpenCL in my machine

Hi,

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.

Regards,

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