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arXiv · 2409.12433

A High-Throughput Hardware Accelerator for Lempel-Ziv 4 Compression Algorithm

Tao Chen·Suwen Song·Zhongfeng Wang
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Abstract

This paper delves into recent hardware implementations of the Lempel-Ziv 4 (LZ4) algorithm, highlighting two key factors that limit the throughput of single-kernel compressors. Firstly, the actual parallelism exhibited in single-kernel designs falls short of the theoretical potential. Secondly, the clock frequency is constrained due to the presence of the feedback loops. To tackle these challenges, we propose a novel scheme that restricts each parallelization window to a single match, thus elevating the level of actual parallelism. Furthermore, by restricting the maximum match length, we eliminate the feedback loops within the architecture, enabling a significant boost in throughput. Finally, we present a high-speed hardware architecture. The implementation results demonstrate that the proposed architecture achieves a throughput of up to 16.10 Gb/s, exhibiting a 2.648x improvement over the start-of-the-art. The new design only results in an acceptable compression ratio reduction ranging from 4.93% to 11.68% with various numbers of hash table entries, compared to the LZ4 compression ratio achieved by official software implementations disclosed on GitHub.

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Tao Chen, Suwen Song, Zhongfeng Wang. 2024-09-19. A High-Throughput Hardware Accelerator for Lempel-Ziv 4 Compression Algorithm. https://arxiv.org/abs/2409.12433

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