Hi,
I have a AMD A8-3850 fusion APU and a PCIex based ATI firepro v4800 Graphics Card.
I have installed the AMD APP SDK 2.6 with Latest ATI catalyst driver 12.1 (I have checked the driver conformance).
The machine runs ubuntu 11.10.
I needed couple of clarifications regarding the way the integrated GPU (on-chip) should behave.
1. It should be enumerated as another GPU device..right? i,e If I do clinfo, I should be seeing
two GPU devices and 1 CPU device..is that correct?
2. If the answer to the above question is yes, then I am seeing a problem. When I run clinfo,
I see only one GPU device (the external one) and one CPU device. I am not able to see
the APU's integrated gpu getting enumerated.
I also tried running the "SimpleMultidevice" program from the AMD kit sample. (I modified it slightly to
list the number of GPU and CPU devices. Here is the ouput.
numGPUDevices 1 numCPUDevices 1
----------------------------------------------------------
CPU + GPU Test 1 : Single context Single Thread
----------------------------------------------------------
Total time : 74
Time of CPU : 73.3002
Time of GPU : 14.6531
----------------------------------------------------------
CPU + GPU Test 2 : Multiple context Single Thread
----------------------------------------------------------
Total time : 74
Time of CPU : 77.6433
Time of GPU : 14.5721
----------------------------------------------------------
CPU + GPU Test 3 : Multiple context Multiple Thread
----------------------------------------------------------
Total time : 74
Time of CPU : 73.3301
Time of GPU : 14.5074
It is able to see only one GPU device. Can someone please clarify as to what might have gone wrong here?
Previous couple of posts related to this issue have gone unanswered.
Below I am pasting the output of clinfo
============================clinfo output===================================================================
Number of platforms: 1
Platform Profile: FULL_PROFILE
Platform Version: OpenCL 1.1 AMD-APP (851.4)
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
Board name: ATI FirePro V4800 (FireGL) Graphics Adapter
Device Topology: PCI[ B#1, D#0, F#0 ]
Max compute units: 5
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: 0Mhz
Address bits: 32
Max memory allocation: 134217728
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: 2048
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: 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: 0x7f0eb2ac3100
Name: Redwood
Vendor: Advanced Micro Devices, Inc.
Device OpenCL C version: OpenCL C 1.1
Driver version: CAL 1.4.1664
Profile: FULL_PROFILE
Version: OpenCL 1.1 AMD-APP (851.4)
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_3d_image_writes cl_khr_byte_addressable_store cl_khr_gl_sharing cl_ext_atomic_counters_32 cl_amd_device_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_media_ops cl_amd_popcnt
Device Type: CL_DEVICE_TYPE_CPU
Device ID: 4098
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: 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: Yes
Cache type: Read/Write
Cache line size: 64
Cache size: 65536
Global memory size: 8369086464
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: 0x7f0eb2ac3100
Name: AMD A8-3850 APU with Radeon(tm) HD Graphics
Vendor: AuthenticAMD
Device OpenCL C version: OpenCL C 1.1
Driver version: 2.0
Profile: FULL_PROFILE
Version: OpenCL 1.1 AMD-APP (851.4)
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_printf cl_amd_media_ops cl_amd_popcnt
Solved! Go to Solution.
Hi jeff,
Thanks a lot for the pointer! The problem was partially in the bios settings. But it was not that of integrated GPU not being enabled, but rather, the integrated GPU was set as the secondary display device and the discrete graphics card as the primary device. Because of this the integrated GPU was not getting recognized in the system even though it was enabled.
Secondly, our XServer had to be configured explicitly with "device" and "screen" sections for both integrated GPU and the Discrete card. Now the problem is resolved.
Thanks again
-Thejas
Make sure you have the integrated GPU enabled in the system BIOS, even when there's a discrete card present.
Hi jeff,
Thanks a lot for the pointer! The problem was partially in the bios settings. But it was not that of integrated GPU not being enabled, but rather, the integrated GPU was set as the secondary display device and the discrete graphics card as the primary device. Because of this the integrated GPU was not getting recognized in the system even though it was enabled.
Secondly, our XServer had to be configured explicitly with "device" and "screen" sections for both integrated GPU and the Discrete card. Now the problem is resolved.
Thanks again
-Thejas
Hello,
As someone who isn't familiar with Linux could you go into more detail what you mean by explicitly setting "device" and "screen" sections for XServer?
Thanks,
Jeff