Snitch Cluster

This repository hosts the hardware and software for the Snitch cluster and its generator. Snitch is a high-efficiency compute cluster platform focused on floating-point workloads. It is developed as part of the PULP project, a joint effort between ETH Zurich and the University of Bologna.

Getting Started

To get started, check out the getting started guide.

Content

What can you expect to find in this repository?

• The RISC-V Snitch integer core. This can be useful stand-alone if you are just interested in re-using the core for your project, e.g., as a tiny control core or you want to make a peripheral smart. The sky is the limit.
• The Snitch cluster. A highly configurable cluster containing one to many integer cores with optional floating-point capabilities as well as our custom ISA extensions Xssr, Xfrep, and Xdma.
• A runtime and example applications for the Snitch cluster.
• RTL simulation environments for Verilator, Questa Advanced Simulator, and VCS, as well as configurations for our Banshee system simulator

This code was previously hosted in the Snitch monorepo and was spun off into its own repository to simplify maintenance and dependency handling. Note that our Snitch-based manycore system Occamy has also moved.

Tool Requirements

• verilator >= v4.1
• bender >= v0.27.0

License

Snitch is being made available under permissive open source licenses.

The following files are released under Apache License 2.0 (Apache-2.0) see LICENSE:

• sw/
• util/

The following files are released under Solderpad v0.51 (SHL-0.51) see hw/LICENSE:

• hw/

The sw/deps directory references submodules that come with their own licenses. See the respective folder for the licenses used.

• sw/deps/

Publications

If you use the Snitch cluster or its extensions in your work, you can cite us:

Snitch: A tiny Pseudo Dual-Issue Processor for Area and Energy Efficient Execution of Floating-Point Intensive Workloads

@article{zaruba2020snitch,
  title={Snitch: A tiny Pseudo Dual-Issue Processor for Area and Energy Efficient Execution of Floating-Point Intensive Workloads},
  author={Zaruba, Florian and Schuiki, Fabian and Hoefler, Torsten and Benini, Luca},
  journal={IEEE Transactions on Computers},
  year={2020},
  publisher={IEEE}
}

Stream semantic registers: A lightweight risc-v isa extension achieving full compute utilization in single-issue cores

@article{schuiki2020stream,
  title={Stream semantic registers: A lightweight risc-v isa extension achieving full compute utilization in single-issue cores},
  author={Schuiki, Fabian and Zaruba, Florian and Hoefler, Torsten and Benini, Luca},
  journal={IEEE Transactions on Computers},
  volume={70},
  number={2},
  pages={212--227},
  year={2020},
  publisher={IEEE}
}

Sparse Stream Semantic Registers: A Lightweight ISA Extension Accelerating General Sparse Linear Algebra

@article{scheffler2023sparsessr,
  author={Scheffler, Paul and Zaruba, Florian and Schuiki, Fabian and Hoefler, Torsten and Benini, Luca},
  journal={IEEE Transactions on Parallel and Distributed Systems},
  title={Sparse Stream Semantic Registers: A Lightweight ISA Extension Accelerating General Sparse Linear Algebra},
  year={2023},
  volume={34},
  number={12},
  pages={3147-3161},
  doi={10.1109/TPDS.2023.3322029}
}

A High-performance, Energy-efficient Modular DMA Engine Architecture

@ARTICLE{benz2023idma,
  author={Benz, Thomas and Rogenmoser, Michael and Scheffler, Paul and Riedel, Samuel and Ottaviano, Alessandro and Kurth, Andreas and Hoefler, Torsten and Benini, Luca},
  journal={IEEE Transactions on Computers},
  title={A High-performance, Energy-efficient Modular DMA Engine Architecture},
  year={2023},
  volume={},
  number={},
  pages={1-14},
  doi={10.1109/TC.2023.3329930}}

MiniFloat-NN and ExSdotp: An ISA Extension and a Modular Open Hardware Unit for Low-Precision Training on RISC-V Cores

@inproceedings{bertaccini2022minifloat,
  author={Bertaccini, Luca and Paulin, Gianna and Fischer, Tim and Mach, Stefan and Benini, Luca},
  booktitle={2022 IEEE 29th Symposium on Computer Arithmetic (ARITH)},
  title={MiniFloat-NN and ExSdotp: An ISA Extension and a Modular Open Hardware Unit for Low-Precision Training on RISC-V Cores},
  year={2022},
  volume={},
  number={},
  pages={1-8}
}

Soft Tiles: Capturing Physical Implementation Flexibility for Tightly-Coupled Parallel Processing Clusters

@inproceedings{paulin2022softtiles,
  author={Paulin, Gianna and Cavalcante, Matheus and Scheffler, Paul and Bertaccini, Luca and Zhang, Yichao and Gürkaynak, Frank and Benini, Luca},
  booktitle={2022 IEEE Computer Society Annual Symposium on VLSI (ISVLSI)},
  title={Soft Tiles: Capturing Physical Implementation Flexibility for Tightly-Coupled Parallel Processing Clusters},
  year={2022},
  volume={},
  number={},
  pages={44-49},
  doi={10.1109/ISVLSI54635.2022.00021}
}

SARIS: Accelerating Stencil Computations on Energy-Efficient RISC-V Compute Clusters with Indirect Stream Registers

@misc{scheffler2024saris,
      title={SARIS: Accelerating Stencil Computations on Energy-Efficient
             RISC-V Compute Clusters with Indirect Stream Registers},
      author={Paul Scheffler and Luca Colagrande and Luca Benini},
      year={2024},
      eprint={},
      archivePrefix={arXiv},
      primaryClass={cs.MS}
}