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Gzip is a file compression format, which is ubiquitously used. Although amultitude of gzip implementations exist, only pugz can fully utilize currentmulti-core processor architectures for decompression. Yet, pugz cannotdecompress arbitrary gzip files. It requires the decompressed stream to onlycontain byte values 9-126. In this work, we present a generalization of theparallelization scheme used by pugz that can be reliably applied to arbitrarygzip-compressed data without compromising performance. We show that therequirements on the file contents posed by pugz can be dropped by implementingan architecture based on a cache and a parallelized prefetcher. Thisarchitecture can safely handle faulty decompression results, which can appearwhen threads start decompressing in the middle of a gzip file by using trialand error. Using 128 cores, our implementation reaches 8.7 GB/s decompressionbandwidth for gzip-compressed base64-encoded data, a speedup of 55 over thesingle-threaded GNU gzip, and 5.6 GB/s for the Silesia corpus, a speedup of 33over GNU gzip.

Rapidgzip: Parallel Decompression and Seeking in Gzip Files Using Cache Prefetching