# Rust and GPUs --- My task since Q2 2021: make [rust-gpu-tools](https://github.com/filecoin-project/rust-gpu-tools/) framework (OpenCL/CUDA) agnostic. --- ## State Q2 2021 - No established still actively maintained Rust libraries for using GPUs (neither OpenCL, nor CUDA) - OpenCL options: - `ocl`: maintaining a fork ourselves - `opencl3`: brand new library started 2020-12-31 --- ## opencl3 - Single person project (it seems) - Was new to Rust (it seems) - Was averse to PRs - Development mode I wasn't used to - Long discussions (thanks @dignifiedquire and @mxinden for helping me with Rust skills) - Building trust - My motivation was fueled by my 2020 Q4 review from @mikeal --- ### State Q3 2021 - OpenCL: :tada: Worked out in the end: `opencl3` is a well maintained Rust library for OpenCL, that has all features we need and is open for improvements. - CUDA: :disappointed: "passively" maintained library ([RustaCUDA](https://github.com/bheisler/RustaCUDA)), needs some investment in the long run. --- ### rust-gpu-tools - Now allows for running GPU kernels with the exact same code on both, OpenCL and CUDA - Devices can be uniquely identified in a more robust way (thanks @neithanmo from Zondax) - Needed for the GPU scheduler work: in a multi-GPU setup, you can put certain tasks on certain GPUs --- The end.