1.7 KiB
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
Measures the duration of adding two vectors. See the README in the folder for more details.
example 02
Demonstrates that one array can be modified several times without having to re-read and re-write data to and from the GPU.
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