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dragonxi4amd
Journeyman III

clInfo Bug [NEXT-RELEASE-FIX]

Device IDs returned by clInfo are not uniques !

In most systems IDs identify resources and are unique in the system i.e.no other resource has the same ID.

Unique IDs make it possible for example to create databases and build relations so that data is not replicated to manage resources such as devices.

IDs are NOT unique in AMDs OpenCL implementation.

Why not URI = Unique Resouce Identification for resourced such as platforms and devices ?

Note: object attributes such as type should not be needed for identification purposes nor any complicated heuristics to detect a device!

 

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4 Replies
himanshu_gautam
Grandmaster

hi d,

Are you saying that you get same deviceID values for two different devices or get same platformID value for different platforms.

Can you please give details of what system you were experimenting on. CPU(s),GPU(s),SDK(s),Driver(s),OS.

Thanks

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Thanks for examining this question!

Device ID is the same both for CPU and GPU in the following configuration,

where OS = 64-bit Windows 7 

 

 Number of platforms:     1
  Platform Profile:     FULL_PROFILE
  Platform Version:     OpenCL 1.1 ATI-Stream-v2.3 (451)
  Platform Name:     ATI Stream
  Platform Vendor:     Advanced Micro Devices, Inc.
  Platform Extensions:     cl_khr_icd cl_amd_event_callback cl_amd_offline_devices cl_khr_d3d10_sharing


  Platform Name:     ATI Stream
  Number of devices:     2
  Device Type:      CL_DEVICE_TYPE_GPU
  Device ID:      4098
  Max compute units:     10
  Max work items dimensions:    3
    Max work items[0]:     256
    Max work items[1]:     256
    Max work items[2]:     256
  Max work group size:     256
  Preferred vector width char:    16
  Preferred vector width short:    8
  Preferred vector width int:    4
  Preferred vector width long:    2
  Preferred vector width float:    4
  Preferred vector width double:   0
  Native vector width char:    0
  Native vector width short:    0
  Native vector width int:    0
  Native vector width long:    0
  Native vector width float:    0
  Native vector width double:    0
  Max clock frequency:     750Mhz
  Address bits:      32
  Max memory allocation:    134217728
  Image support:     No
  Max size of kernel argument:    1024
  Alignment (bits) of base address:   32768
  Minimum alignment (bytes) for any datatype:  128
  Single precision floating point capability
    Denorms:      No
    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:      None
  Cache line size:     0
  Cache size:      0
  Global memory size:     536870912
  Constant buffer size:     65536
  Max number of constant args:    8
  Local memory type:     Global
  Local memory size:     16384
  Kernel Preferred work group size multiple:  64
  Error correction support:    0
  Unified memory for Host and Device:   0
  Profiling timer resolution:    1
  Device endianess:     Little
  Available:      Yes
  Compiler available:     Yes
  Execution capabilities:    
    Execute OpenCL kernels:    Yes
    Execute native function:    No
  Queue properties:    
    Out-of-Order:     No
    Profiling :      Yes
  Platform ID:      0000000001509568
  Name:       ATI RV770
  Vendor:      Advanced Micro Devices, Inc.
  Driver version:     CAL 1.4.900
  Profile:      FULL_PROFILE
  Version:      OpenCL 1.0 ATI-Stream-v2.3 (451)
  Extensions:      cl_amd_fp64 cl_khr_gl_sharing cl_amd_device_attribute_query cl_khr_d3d10_sharing


  Device Type:      CL_DEVICE_TYPE_CPU
  Device ID:      4098
  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:    4
  Preferred vector width double:   0
  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:    0
  Max clock frequency:     3210Mhz
  Address bits:      64
  Max memory allocation:    1073741824
  Image support:     No
  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:   No
  Cache type:      Read/Write
  Cache line size:     64
  Cache size:      65536
  Global memory size:     3221225472
  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:    318
  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:      0000000001509568
  Name:       AMD Phenom(tm) II X4 955 Processor
  Vendor:      AuthenticAMD
  Driver version:     2.0
  Profile:      FULL_PROFILE
  Version:      OpenCL 1.1 ATI-Stream-v2.3 (451)
  Extensions:      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_byte_addressable_store cl_khr_gl_sharing cl_ext_device_fission cl_amd_device_attribute_query cl_amd_media_ops cl_amd_popcnt cl_amd_printf cl_khr_d3d10_sharing

 

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same here with 64bit Ubuntu Linux and Catalyst 11.2, but AMD APP SDK 2.4:

Number of platforms:                 1
  Platform Profile:                 FULL_PROFILE
  Platform Version:                 OpenCL 1.1 AMD-APP-SDK-v2.4 (595.10)
  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:                 2
  Device Type:                     CL_DEVICE_TYPE_GPU
  Device ID:                     4098
  Max compute units:                 22
  Max work items dimensions:             3
    Max work items[0]:                 256
    Max work items[1]:                 256
    Max work items[2]:                 256
  Max work group size:                 256
  Preferred vector width char:             16
  Preferred vector width short:             8
  Preferred vector width int:             4
  Preferred vector width long:             2
  Preferred vector width float:             4
  Preferred vector width double:         0
  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:             0
  Max clock frequency:                 840Mhz
  Address bits:                     32
  Max memory allocation:             268435456
  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:             1024
  Alignment (bits) of base address:         32768
  Minimum alignment (bytes) for any datatype:     128
  Single precision floating point capability
    Denorms:                     No
    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:                     None
  Cache line size:                 0
  Cache size:                     0
  Global memory size:                 1073741824
  Constant buffer size:                 65536
  Max number of constant args:             8
  Local memory type:                 Scratchpad
  Local memory size:                 32768
  Kernel Preferred work group size multiple:     64
  Error correction support:             0
  Unified memory for Host and Device:         0
  Profiling timer resolution:             1
  Device endianess:                 Little
  Available:                     Yes
  Compiler available:                 Yes
  Execution capabilities:                 
    Execute OpenCL kernels:             Yes
    Execute native function:             No
  Queue properties:                 
    Out-of-Order:                 No
    Profiling :                     Yes
  Platform ID:                     0x7fca3a252800
  Name:                         Cayman
  Vendor:                     Advanced Micro Devices, Inc.
  Driver version:                 CAL 1.4.1016
  Profile:                     FULL_PROFILE
  Version:                     OpenCL 1.1 AMD-APP-SDK-v2.4 (595.10)
  Extensions:                     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_3d_image_writes cl_khr_byte_addressable_store cl_khr_gl_sharing cl_amd_device_attribute_query cl_amd_printf cl_amd_media_ops cl_amd_popcnt


  Device Type:                     CL_DEVICE_TYPE_CPU
  Device ID:                     4098
  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:             4
  Preferred vector width double:         0
  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:             0
  Max clock frequency:                 800Mhz
  Address bits:                     64
  Max memory allocation:             2147483648
  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:         No
  Cache type:                     Read/Write
  Cache line size:                 64
  Cache size:                     65536
  Global memory size:                 4154441728
  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:                     0x7fca3a252800
  Name:                         AMD Phenom(tm) II X4 920 Processor
  Vendor:                     AuthenticAMD
  Driver version:                 2.0
  Profile:                     FULL_PROFILE
  Version:                     OpenCL 1.1 AMD-APP-SDK-v2.4 (595.10)
  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_byte_addressable_store cl_khr_gl_sharing cl_ext_device_fission cl_amd_device_attribute_query cl_amd_vec3 cl_amd_media_ops cl_amd_popcnt cl_amd_printf

 

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From the clInfo code, I find that we are actually displaying the Device Vendor String. I guess the metric written there should more appropriately be renamed.

As far your unique ID is concerned try using the cl_device_id* returned by clGetDeviceID.

Thanks for reporting the issue. i will see it gets fixed in clInfo.

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