はじめに
みなさん、Intel Arc A380買いました？
グローバルではA770, A750といった上位モデルがリリースされている昨今ですが、Intel Arc A380を(ようやく) GPGPUデバイスとして動かすことができたので、その備忘録です。
環境構築
2022/10/13現在、Intel ArcシリーズをLinuxでキレイにサポートしてくれている環境はないです。Linux kernel 6.1になるとフルサポートが入るとかなんとか。仕方ないので、イチから作りましょう。
…といって、某Phoronixを参考に色々作って試してみてたんですが、いまいちうまく行かなくてgithubで聞いたところ、
というドキュメントを教えてもらいました。
この手順に従えば一発で動きます。
動かしてみた結果
- clinfo
Number of platforms 1
Platform Name Intel(R) OpenCL HD Graphics
Platform Vendor Intel(R) Corporation
Platform Version OpenCL 3.0
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_byte_addressable_store cl_khr_fp16 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_icd cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_intel_command_queue_families cl_intel_subgroups cl_intel_required_subgroup_size cl_
intel_subgroups_short cl_khr_spir cl_intel_accelerator cl_intel_driver_diagnostics cl_khr_priority_hints cl_khr_throttle_hints cl_khr_create_command_queue cl_intel_subgroups_char cl_intel_subgroups_long cl_khr_il_program cl_intel_mem_force_host_memory cl_khr_subgroup_extended_types cl_khr_subgroup_non_uniform_vote cl_khr_subgroup_ballot cl_khr_subgroup_non_uniform_arithmetic cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_khr_subgroup_clustered_reduce cl_intel_device_attribute_query cl_khr_suggested_local_work_size cl_intel_split_work_group_barrier cl_intel_spirv_media_block_io cl_intel_spirv_subgroups cl_khr_spirv_no_integer_wrap_decoration cl_intel_unified_shared_memory cl_khr_mipmap_image cl_khr_mipmap_image_writes cl_intel_planar_yuv cl_intel_packed_yuv cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_image2d_from_buffer cl_khr_depth_images cl_khr_3d_image_writes cl_intel_media_block_io cl_intel_bfloat16_conversions cl_intel_va_api_media_sharing cl_intel_sharing_format_query cl_khr_pci_bus_info cl_intel_create_buffer_with_properties cl_intel_dot_accumulate cl_intel_subgroup_local_block_io cl_intel_subgroup_matrix_multiply_accumulate cl_intel_subgroup_split_matrix_multiply_accumulate
Platform Host timer resolution 1ns
Platform Extensions function suffix INTEL
Platform Name Intel(R) OpenCL HD Graphics
Number of devices 1
Device Name Intel(R) Graphics [0x56a5]
Device Vendor Intel(R) Corporation
Device Vendor ID 0x8086
Device Version OpenCL 3.0 NEO
Driver Version 22.24.23453
Device OpenCL C Version OpenCL C 1.2
Device Type GPU
Device Profile FULL_PROFILE
Device Available Yes
Compiler Available Yes
Linker Available Yes
Max compute units 128
Max clock frequency 2450MHz
Device Partition (core)
Max number of sub-devices 0
Supported partition types None
Supported affinity domains (n/a)
Max work item dimensions 3
Max work item sizes 1024x1024x1024
Max work group size 1024
Preferred work group size multiple 64
Max sub-groups per work group 128
Sub-group sizes (Intel) 8, 16, 32
Preferred / native vector sizes
char 16 / 16
short 8 / 8
int 4 / 4
long 1 / 1
half 8 / 8 (cl_khr_fp16)
float 1 / 1
double 1 / 1 (n/a)
Half-precision Floating-point support (cl_khr_fp16)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Single-precision Floating-point support (core)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Correctly-rounded divide and sqrt operations Yes
Double-precision Floating-point support (n/a)
Address bits 64, Little-Endian
Global memory size 255012864 (243.2MiB)
Error Correction support No
Max memory allocation 127506432 (121.6MiB)
Unified memory for Host and Device No
Shared Virtual Memory (SVM) capabilities (core)
Coarse-grained buffer sharing Yes
Fine-grained buffer sharing No
Fine-grained system sharing No
Atomics No
Minimum alignment for any data type 128 bytes
Alignment of base address 1024 bits (128 bytes)
Preferred alignment for atomics
SVM 64 bytes
Global 64 bytes
Local 64 bytes
Max size for global variable 65536 (64KiB)
Preferred total size of global vars 127506432 (121.6MiB)
Global Memory cache type Read/Write
Global Memory cache size 0
Global Memory cache line size 64 bytes
Image support Yes
Max number of samplers per kernel 16
Max size for 1D images from buffer 7969152 pixels
Max 1D or 2D image array size 2048 images
Base address alignment for 2D image buffers 4 bytes
Pitch alignment for 2D image buffers 4 pixels
Max 2D image size 16384x16384 pixels
Max planar YUV image size 16384x16128 pixels
Max 3D image size 16384x16384x2048 pixels
Max number of read image args 128
Max number of write image args 128
Max number of read/write image args 128
Max number of pipe args 0
Max active pipe reservations 0
Max pipe packet size 0
Local memory type Local
Local memory size 65536 (64KiB)
Max number of constant args 8
Max constant buffer size 127506432 (121.6MiB)
Max size of kernel argument 2048 (2KiB)
Queue properties (on host)
Out-of-order execution Yes
Profiling Yes
Queue properties (on device)
Out-of-order execution No
Profiling No
Preferred size 0
Max size 0
Max queues on device 0
Max events on device 0
Prefer user sync for interop Yes
Profiling timer resolution 52ns
Execution capabilities
Run OpenCL kernels Yes
Run native kernels No
Sub-group independent forward progress No
IL version SPIR-V_1.2
SPIR versions 1.2
printf() buffer size 4194304 (4MiB)
Built-in kernels (n/a)
Device Extensions cl_khr_byte_addressable_store cl_khr_fp16 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_icd cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_intel_command_queue_families cl_intel_subgroups cl_intel_required_subgroup_size cl_intel_subgroups_short cl_khr_spir cl_intel_accelerator cl_intel_driver_diagnostics cl_khr_priority_hints cl_khr_throttle_hints cl_khr_create_command_queue cl_intel_subgroups_char cl_intel_subgroups_long cl_khr_il_program cl_intel_mem_force_host_memory cl_khr_subgroup_extended_types cl_khr_subgroup_non_uniform_vote cl_khr_subgroup_ballot cl_khr_subgroup_non_uniform_arithmetic cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_khr_subgroup_clustered_reduce cl_intel_device_attribute_query cl_khr_suggested_local_work_size cl_intel_split_work_group_barrier cl_intel_spirv_media_block_io cl_intel_spirv_subgroups cl_khr_spirv_no_integer_wrap_decoration cl_intel_unified_shared_memory cl_khr_mipmap_image cl_khr_mipmap_image_writes cl_intel_planar_yuv cl_intel_packed_yuv cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_image2d_from_buffer cl_khr_depth_images cl_khr_3d_image_writes cl_intel_media_block_io cl_intel_bfloat16_conversions cl_intel_va_api_media_sharing cl_intel_sharing_format_query cl_khr_pci_bus_info cl_intel_create_buffer_with_properties cl_intel_dot_accumulate cl_intel_subgroup_local_block_io cl_intel_subgroup_matrix_multiply_accumulate cl_intel_subgroup_split_matrix_multiply_accumulate
NULL platform behavior
clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) Intel(R) OpenCL HD Graphics
clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) Success [INTEL]
clCreateContext(NULL, ...) [default] Success [INTEL]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) Success (1)
Platform Name Intel(R) OpenCL HD Graphics
Device Name Intel(R) Graphics [0x56a5]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) Success (1)
Platform Name Intel(R) OpenCL HD Graphics
Device Name Intel(R) Graphics [0x56a5]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL) Success (1)
Platform Name Intel(R) OpenCL HD Graphics
Device Name Intel(R) Graphics [0x56a5]
ICD loader properties
ICD loader Name OpenCL ICD Loader
ICD loader Vendor OCL Icd free software
ICD loader Version 2.2.11
ICD loader Profile OpenCL 2.1
NOTE: your OpenCL library only supports OpenCL 2.1,
but some installed platforms support OpenCL 3.0.
Programs using 3.0 features may crash
or behave unexpectedly
A380,というか、Xe−HPGってdoubleサポートしてないっぽいんですよね…残念。
- clpeak
より、clpeakを動かしてみました。
$ ./clpeak
Platform: Intel(R) OpenCL HD Graphics
Device: Intel(R) Graphics [0x56a5]
Driver version : 22.24.23453 (Linux x64)
Compute units : 128
Clock frequency : 2450 MHz
Global memory bandwidth (GBPS)
float : 109.08
float2 : 111.76
float4 : 115.32
float8 : 115.60
float16 : 117.49
Single-precision compute (GFLOPS)
float : 3282.88
float2 : 2806.91
float4 : 2623.91
float8 : 2597.03
float16 : 2448.10
Half-precision compute (GFLOPS)
half : 4921.48
half2 : 4911.95
half4 : 4909.31
half8 : 4908.17
half16 : 4853.99
No double precision support! Skipped
Integer compute (GIOPS)
int : 1183.67
int2 : 1356.22
int4 : 1205.06
int8 : 1385.80
int16 : 1167.13
Integer compute Fast 24bit (GIOPS)
int : 1178.15
int2 : 1351.02
int4 : 1202.26
int8 : 1377.92
int16 : 1165.42
Transfer bandwidth (GBPS)
enqueueWriteBuffer : 4.67
enqueueReadBuffer : 4.33
enqueueWriteBuffer non-blocking : 5.02
enqueueReadBuffer non-blocking : 4.62
enqueueMapBuffer(for read) : 5.17
memcpy from mapped ptr : 10.10
enqueueUnmap(after write) : 5.11
memcpy to mapped ptr : 10.39
Kernel launch latency : 11.83 us
まとめ
A380をGPGPUデバイスとして使うのは色々大変でした。
が、全部OSSでできるようにしているIntelはすごいと思います。まぁAMDもGPUOpenという試みでやってますし、確かAMDのが先駆者だった気もしますが。
doubleをサポートしていない点、それからなんかPCIeの帯域が低い点(これはなぜかx1であがっているからっぽい) が気になります。
まぁこの環境、Resizable BARに対応してないので、それのせいな気がしないでもないですけど…うーんなんでx1になるんだろ。謎。
PCIeについてはまた何か変わったらそのうち追記します。
これでA770がいつローンチしても大丈夫だな！！(？