Thank for your reply~
1. setup information:
OS: Linux 3.2.0-54-generic x86_64 Ubuntu14.10
X.org: 1.16.0
glibc: 2.19
2. clinfo
Number of platforms: 1
Platform Profile: FULL_PROFILE
Platform Version: OpenCL 2.0 AMD-APP (1642.5)
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
Vendor ID:1002h
Board name:AMD Radeon(TM) R7 Graphics
Device Topology: PCI[ B#0, D#1, F#0 ]
Max compute units:8
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:4
Preferred vector width short:2
Preferred vector width int:1
Preferred vector width long:1
Preferred vector width float:1
Preferred vector width double:1
Native vector width char:4
Native vector width short:2
Native vector width int:1
Native vector width long:1
Native vector width float:1
Native vector width double:1
Max clock frequency:720Mhz
Address bits:64
Max memory allocation:451411968
Image support:Yes
Max number of images read arguments:128
Max number of images write arguments:64
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: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:Read/Write
Cache line size:64
Cache size:16384
Global memory size:1803550720
Constant buffer size:65536
Max number of constant args:8
Local memory type:Scratchpad
Local memory size:32768
Max pipe arguments:16
Max pipe active reservations:16
Max pipe packet size:451411968
Max global variable size:406270720
Max global variable preferred total size: 1803550720
Max read/write image args:64
Max on device events:1024
Queue on device max size:524288
Max on device queues:1
Queue on device preferred size:16384
SVM capabilities:
Coarse grain buffer:Yes
Fine grain buffer:Yes
Fine grain system:No
Atomics:No
Preferred platform atomic alignment:0
Preferred global atomic alignment:0
Preferred local atomic alignment:0
Kernel Preferred work group size multiple:64
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:No
Queue on Host properties:
Out-of-Order:No
Profiling :Yes
Queue on Device properties:
Out-of-Order:Yes
Profiling :Yes
Platform ID:0x7fc554fdcfd0
Name:Spectre
Vendor:Advanced Micro Devices, Inc.
Device OpenCL C version:OpenCL C 2.0
Driver version:1642.5 (VM)
Profile:FULL_PROFILE
Version:OpenCL 2.0 AMD-APP (1642.5)
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_atomic_counters_32
cl_amd_device_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_media_ops
cl_amd_media_ops2 cl_amd_popcnt cl_khr_image2d_from_buffer cl_khr_spir cl_khr_subgroups
cl_khr_gl_event cl_khr_depth_images
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:1700Mhz
Address bits:64
Max memory allocation:3909684224
Image support:Yes
Max number of images read arguments:128
Max number of images write arguments:64
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:16384
Global memory size:15638736896
Constant buffer size:65536
Max number of constant args:8
Local memory type:Global
Local memory size:32768
Max pipe arguments:16
Max pipe active reservations:16
Max pipe packet size:3909684224
Max global variable size:1879048192
Max global variable preferred total size: 1879048192
Max read/write image args:64
Max on device events:0
Queue on device max size:0
Max on device queues:0
Queue on device preferred size:0
SVM capabilities:
Coarse grain buffer:Yes
Fine grain buffer:Yes
Fine grain system:Yes
Atomics:Yes
Preferred platform atomic alignment:0
Preferred global atomic alignment:0
Preferred local atomic alignment:0
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 on Host properties:
Out-of-Order:No
Profiling :Yes
Queue on Device properties:
Out-of-Order:No
Profiling :No
Platform ID:0x7fc554fdcfd0
Name:AMD A10-7850K Radeon R7, 12 Compute
Cores 4C+8G
Vendor:AuthenticAMD
Device OpenCL C version:OpenCL C 1.2
Driver version:1642.5 (sse2,avx,fma4)
Profile:FULL_PROFILE
Version:OpenCL 1.2 AMD-APP (1642.5)
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_media_ops2 cl_amd_popcnt cl_khr_spir cl_khr_gl_event
