OpenCL Examples
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1) To test the Arm Compute Library (v18.03):

cd armcl_examples
LD_LIBRARY_PATH=. examples/cl_events image.ppm

(As a result, you will get a downsized and grayscaled version of the image, named "image.ppm_out.ppm"
Conversion was done using OpenCL in the Mali GPU)

You can try more complex examples like this one:
https://developer.arm.com/technologies/machine-learning-on-arm/developer-material/how-to-guides/running-alexnet-on-raspberry-pi-with-compute-library/introducing-the-graph-api

Here is a guide to download and compile the complete Arm Compute Library (it is also valid for RK3288 boards):
https://www.cnx-software.com/2018/05/13/how-to-get-started-with-opencl-on-odroid-xu4-board-with-arm-mali-t628mp6-gpu/



2) To test a GPU crypto miner

cd cgminer_skein
./cgminer --skein -o stratum+tcp://eu1.protopool.net:4922 -u LNdATKAq3bvQ3BsbsERHicXRtjsvPJS4dK.tester -p d=0.01,tester

(This is a test wallet I created some time ago, just in case you don't have your own and want to use it. Don't worry, I won't get rich with this)  ;)