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Update stats for lz4ultra 1.1.3 --favor-decSpeed
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emmanuel-marty authored May 15, 2019
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Expand Up @@ -3,15 +3,16 @@ lz4ultra -- Optimal LZ4 packer with faster decompression

lz4ultra is a command-line optimal compression utility that produces compressed files in the [lz4](https://github.com/lz4/lz4) format created by Yann Collet.

The tool creates optimally compressed files, like lz4 in optimal compression mode ("lz4hc"), smallLZ4, blz4 and lz4x. The files decompress slightly faster.
The tool creates optimally compressed files, like lz4 in optimal compression mode ("lz4hc"), smallLZ4, blz4 and lz4x. The files created with lz4ultra decompress faster.

lz4ultra beats lz4 1.9.1 --12 --favor-decSpeed in both size and the number of tokens produced. With enwik9 (1,000,000,000 bytes):
lz4ultra beats lz4 1.9.1 --12 --favor-decSpeed in both size and decompression speed. With enwik9 (1,000,000,000 bytes):

Compr.size Tokens
lz4 1.9.1 --12 (favor ratio) 371,680,440 95,708,169
smalLZ4 1.3 371,680,328 93,172,985
lz4 1.9.1 --12 --favor-decSpeed 376,408,347 92,105,212
lz4ultra 1.1.0 371,687,509 85,910,002 <---------
Compr.size Tokens Decomp.time (ms)
lz4 1.9.1 --12 (favor ratio) 371,680,440 95,708,169 345,272
smalLZ4 1.3 371,680,328 93,172,985 343,571
lz4ultra 1.1.3 (favor ratio) 371,687,509 85,910,002 342,159
lz4 1.9.1 --12 --favor-decSpeed 376,408,347 92,105,212 304,911
lz4ultra 1.1.3 --favor-decSpeed 376,118,380 88,521,891 289,355 <--------------

The produced files are meant to be decompressed with the lz4 tool and library. While lz4ultra includes a decompressor, it is mostly meant to verify the output of the compressor and isn't as optimized as Yann Collet's lz4 proper.

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