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november 13, 2017
This is a follow up to OpenCL on IntelHD on Debian. This time I'll show the installation necessary in order to use OpenCL on AMD hardware.
When I wrote up OpenCL on IntelHD on Debian, I read https://wiki.debian.org/ATIStream and got the impression that the non-free AMD drivers where necessary in order to get OpenCL working on AMD hardware in debian. But it turns out there is a fully FLOSS OpenCL stack, which is nice because the video drivers of the non-free stack did not work as well as the FLOSS video drivers for my card.
The parts of the OpenCL stack are:
There are several different OpenCL stacks, and the Intel one was installed in the previous post. What packages constitute the parts of the different FLOSS OpenCL stacks?
| Component | FLOSS | non-free AMD | non-free nvidia |
|---|---|---|---|
| ICD Loader | ocl-icd-libopencl1 | amd-libopencl1 | nvidia-libopencl1 |
| OpenCL library | mesa-opencl-icd (general), beignet-opencl-icd (for intel hardware) | amd-opencl-icd | nvidia-opencl-icd |
| Header and libraries | ocl-icd-opencl-dev | amd-opencl-dev | nvidia-opencl-dev |
In the FLOSS stack, beignet-opencl-icd include hardware specific stuff, while mesa-opencl-icd instead depends on packages with hardware specific implementations: libclc-r600, libclc-amdgcn, libdrm-amdgpu1, libdrm-nouveau2, libdrm-radeon1.
So, to get a free OpenCL stack for AMD hardware, I issued:
sudo apt-get install ocl-icd-libopencl1 mesa-opencl-icd ocl-icd-opencl-dev
which triggered removal of: amd-libopencl1 amd-opencl-dev
and added the following packges to be installed:
libclang-common-3.9-dev libclc-amdgcn libclc-dev libclc-r600 libpoclu-dev libpoclu1 mesa-opencl-icd ocl-icd-libopencl1 ocl-icd-opencl-dev
Number of platforms 1
Platform Name Clover
Platform Vendor Mesa
Platform Version OpenCL 1.1 Mesa 13.0.6
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_icd
Platform Extensions function suffix MESA
Platform Name Clover
Number of devices 1
Device Name AMD CAICOS (DRM 2.48.0 / 4.9.0-3-amd64, LLVM 3.9.1)
Device Vendor AMD
Device Vendor ID 0x1002
Device Version OpenCL 1.1 Mesa 13.0.6
Driver Version 13.0.6
Device OpenCL C Version OpenCL C 1.1
Device Type GPU
Device Profile FULL_PROFILE
Max compute units 2
Max clock frequency 625MHz
Max work item dimensions 3
Max work item sizes 256x256x256
Max work group size 256
Preferred work group size multiple 64
Preferred / native vector sizes
char 16 / 16
short 8 / 8
int 4 / 4
long 2 / 2
half 0 / 0 (n/a)
float 4 / 4
double 0 / 0 (n/a)
Half-precision Floating-point support (n/a)
Single-precision Floating-point support (core)
Denormals No
Infinity and NANs Yes
Round to nearest Yes
Round to zero No
Round to infinity No
IEEE754-2008 fused multiply-add No
Support is emulated in software No
Correctly-rounded divide and sqrt operations No
Double-precision Floating-point support (n/a)
Address bits 32, Little-Endian
Global memory size 1073741824 (1024MiB)
Error Correction support No
Max memory allocation 751619276 (716.8MiB)
Unified memory for Host and Device Yes
Minimum alignment for any data type 128 bytes
Alignment of base address 1024 bits (128 bytes)
Global Memory cache type None
Image support No
Local memory type Local
Local memory size 32768 (32KiB)
Max constant buffer size 751619276 (716.8MiB)
Max number of constant args 13
Max size of kernel argument 1024
Queue properties
Out-of-order execution No
Profiling Yes
Profiling timer resolution 0ns
Execution capabilities
Run OpenCL kernels Yes
Run native kernels No
Device Available Yes
Compiler Available Yes
Device 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_byte_addressable_store
NULL platform behavior
clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) Clover
clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) Success [MESA]
clCreateContext(NULL, ...) [default] Success [MESA]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) Success (1)
Platform Name Clover
Device Name AMD CAICOS (DRM 2.48.0 / 4.9.0-3-amd64, LLVM 3.9.1)
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 Clover
Device Name AMD CAICOS (DRM 2.48.0 / 4.9.0-3-amd64, LLVM 3.9.1)
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