Discussions

jinchuantang · ‎10-09-2021

Dear ROCm team and other OpenCL experts,

I need your help on using your APUs with OpenCL. Today I installed a new APU platform with AMD's 5700G with the intention to use its OpenCL functionality with Octave and Octave-ocl (https://sourceforge.net/projects/octave-ocl/files/). Octave is well known as an opensource alternative to Matlab, while Octave-ocl enables the similar gpuArray functionality in Octave with OpenCL devices as compared to CUDA only in Matlab. I was a tiny contributor to octave-ocl with some of my testing and coding as well as my own fork page (https://sourceforge.net/u/tangjinchuan/octave-ocl-gzu/ci/default/tree/). However, the problem I face with AMD's APU just above my limit in time.

The problem is that any time I try to use AMD's platform driver (for example, OpenCL 2.1 AMD-APP (3302.6)), the Octave program will crash.

You can try install Octave 6.3 (select a directory without any space, otherwise there will be problem), and pkg install the Octave-ocl tar.gz file.

For example:

>>pkg install ocl-1.1.1.tar.gz

% this will install the ocl pkg in octave

>>pkg load ocl

% this will load ocl pkg

>>gpuArray(1,5)

% this will generate a GPU array with 1 row, 5 colums of ones. BUt it will make the Octave program crash.

My experience：
I had no problems with ocl in Nvidia (e.g. RTX 3080), Intel CPUs/GPUs. But 5700G will give a crash. (and I remembered a very long time ago, I borrowed another older amd APUs, it also crashed the program). More info on different drivers, please see my page: https://sourceforge.net/u/tangjinchuan/wiki/browse_pages/

I had no problem with AMD's 5700G CPUs (Yes, its CPU part even though AMD dropped the Windows OpenCL support for CPUs ) even if I choose Intel's OpenCL runtime to run any OpenCL tasks.

I had no problem with AMD's 5700G GPUs if I choose Microsoft's OpenCL on DX12 runtime to run any 32bit OpenCL tasks (Unfortunately, it does not support 64bits).

To select the opencl driver, we can use >> ocl_context ("device_selection", 'GPU0')

GPUn represent the nth GPU driver, while ocl_context ("device_selection", 'CPU') ask to run CPUs. Also U can use

I tried to find the problem with Windows cmd, it gives the following results:

C:\Users\Owner>octave
'octave' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\Owner>cd C:\Octave-6.3.0\mingw64\bin

C:\Octave-6.3.0\mingw64\bin>octave-cli-6.3.0.exe
GNU Octave, version 6.3.0
Copyright (C) 2021 The Octave Project Developers.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. For details, type 'warranty'.

Octave was configured for "x86_64-w64-mingw32".

Additional information about Octave is available at https://www.octave.org.

Please contribute if you find this software useful.
For more information, visit https://www.octave.org/get-involved.html

Read https://www.octave.org/bugs.html to learn how to submit bug reports.
For information about changes from previous versions, type 'news'.

octave:1> pkd load ocl
error: 'pkd' undefined near line 1, column 1
octave:2> pkg load ocl
octave:3> ocl_ones(1,5)
error: Invalid record (Producer: 'LLVM3.9.0svn' Reader: 'LLVM 3.9.0svn')

C:\Octave-6.3.0\mingw64\bin>octave-cli-6.3.0.exe

Also, my platform info get from Octave-ocl

>> ocl_context('get_resources')
ans =