Update benchmarks and add fast mode
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README.md
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README.md
@ -31,10 +31,10 @@ a list of known ports and bindings is provided on [Zstandard homepage](http://ww
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## Benchmarks
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For reference, several fast compression algorithms were tested and compared
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on a server running Arch Linux (`Linux version 5.0.5-arch1-1`),
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on a server running Arch Linux (`Linux version 5.5.11-arch1-1`),
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with a Core i9-9900K CPU @ 5.0GHz,
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using [lzbench], an open-source in-memory benchmark by @inikep
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compiled with [gcc] 8.2.1,
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compiled with [gcc] 9.3.0,
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on the [Silesia compression corpus].
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[lzbench]: https://github.com/inikep/lzbench
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@ -43,18 +43,26 @@ on the [Silesia compression corpus].
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| Compressor name | Ratio | Compression| Decompress.|
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| --------------- | ------| -----------| ---------- |
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| **zstd 1.4.4 -1** | 2.884 | 520 MB/s | 1600 MB/s |
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| zlib 1.2.11 -1 | 2.743 | 110 MB/s | 440 MB/s |
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| brotli 1.0.7 -0 | 2.701 | 430 MB/s | 470 MB/s |
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| quicklz 1.5.0 -1 | 2.238 | 600 MB/s | 800 MB/s |
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| lzo1x 2.09 -1 | 2.106 | 680 MB/s | 950 MB/s |
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| lz4 1.8.3 | 2.101 | 800 MB/s | 4220 MB/s |
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| snappy 1.1.4 | 2.073 | 580 MB/s | 2020 MB/s |
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| lzf 3.6 -1 | 2.077 | 440 MB/s | 930 MB/s |
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| **zstd 1.4.5 -1** | 2.884 | 500 MB/s | 1660 MB/s |
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| zlib 1.2.11 -1 | 2.743 | 90 MB/s | 400 MB/s |
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| brotli 1.0.7 -0 | 2.703 | 400 MB/s | 450 MB/s |
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| **zstd 1.4.5 --fast=1** | 2.434 | 570 MB/s | 2200 MB/s |
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| **zstd 1.4.5 --fast=3** | 2.312 | 640 MB/s | 2300 MB/s |
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| quicklz 1.5.0 -1 | 2.238 | 560 MB/s | 710 MB/s |
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| **zstd 1.4.5 --fast=5** | 2.178 | 700 MB/s | 2420 MB/s |
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| lzo1x 2.10 -1 | 2.106 | 690 MB/s | 820 MB/s |
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| lz4 1.9.2 | 2.101 | 740 MB/s | 4530 MB/s |
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| **zstd 1.4.5 --fast=7** | 2.096 | 750 MB/s | 2480 MB/s |
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| lzf 3.6 -1 | 2.077 | 410 MB/s | 860 MB/s |
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| snappy 1.1.8 | 2.073 | 560 MB/s | 1790 MB/s |
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[zlib]: http://www.zlib.net/
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[LZ4]: http://www.lz4.org/
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The negative compression levels, specified with `--fast=#`,
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offer faster compression and decompression speed in exchange for some loss in
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compression ratio compared to level 1, as seen in the table above.
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Zstd can also offer stronger compression ratios at the cost of compression speed.
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Speed vs Compression trade-off is configurable by small increments.
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Decompression speed is preserved and remains roughly the same at all settings,
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