Xpress Compression Algorithm is Microsoft compression format that combines the dictionary based LZ77 method and Huffman encoding, similar to popular GZIP compression. Xpress9 is an advanced branch of Xpress family algorithms targeting higher compression ratio with more optimization on both stages.
The system architecture supports up to 128 multi-threaded compression contexts with custom PCIe interface and queue managements. We integrate up to 7 compression engines on Altera Stratix D5 FPGA each of which accelerates full features of Xpress9 algorithm. The hardware scheduler maximizes throughput performance of the engines.
Results & Future Projection
The proposed hardware compressor achieved 6% better and 30x more throughput than software based GZIP compression with level 9 (best) optimization on a single Zeon core. We are also targeting other compression domains such as low compression – high throughput, high compression – low throughput to push this Pareto curve of compression ratio vs throughput with hardware acceleration.