OpenCL-examples/README.md

OpenCL basic examples

here is my feeble attempt at learning OpenCL, please don't make fun of me too much 🍔

Configuration

This currently runs on OS X, and I'm using local header files instead of global header files because I'm unfamiliar with C++. Deal with it. Run the following in a terminal to set up:

git clone git@github.com:SaintDako/OpenCL-examples.git
cd OpenCL-examples
mkdir CL
curl https://www.khronos.org/registry/cl/api/1.2/cl.hpp -o CL/cl.hpp

example 00

this example is based off of this example (example-ception), but it goes a bit further. In the blogspot example, two 10-element vectors are created and a thread is used for each pair of elements. In this example, 10 threads are spawned but two 100-element vectors are used, and it is shown how to split up a specific number of elements per thread.

example 01

See the README in the folder.

TODO

• figure out how OpenCL manages memory (when are buffers cleared on the GPU?)
• figure out how to view the OpenCL assembly code if possible (is warp divergence happening?)

Some Notes

From the guide on programming OpenCL for NVIDIA:

• CUDA streaming multiprocessor corresponds to an OpenCL compute unit
• CUDA thread corresponds to an OpenCL work-item
• CUDA thread block corresponds to an OpenCL work-group