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Diffstat (limited to 'vendor/github.com/klauspost/compress/zstd/README.md')
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1 files changed, 18 insertions, 7 deletions
diff --git a/vendor/github.com/klauspost/compress/zstd/README.md b/vendor/github.com/klauspost/compress/zstd/README.md index 08e553f75..7680bfe1d 100644 --- a/vendor/github.com/klauspost/compress/zstd/README.md +++ b/vendor/github.com/klauspost/compress/zstd/README.md @@ -24,22 +24,21 @@ Godoc Documentation: https://godoc.org/github.com/klauspost/compress/zstd ### Status: STABLE - there may always be subtle bugs, a wide variety of content has been tested and the library is actively -used by several projects. This library is being continuously [fuzz-tested](https://github.com/klauspost/compress-fuzz), -kindly supplied by [fuzzit.dev](https://fuzzit.dev/). +used by several projects. This library is being [fuzz-tested](https://github.com/klauspost/compress-fuzz) for all updates. There may still be specific combinations of data types/size/settings that could lead to edge cases, so as always, testing is recommended. For now, a high speed (fastest) and medium-fast (default) compressor has been implemented. -The "Fastest" compression ratio is roughly equivalent to zstd level 1. -The "Default" compression ratio is roughly equivalent to zstd level 3 (default). +* The "Fastest" compression ratio is roughly equivalent to zstd level 1. +* The "Default" compression ratio is roughly equivalent to zstd level 3 (default). +* The "Better" compression ratio is roughly equivalent to zstd level 7. +* The "Best" compression ratio is roughly equivalent to zstd level 11. In terms of speed, it is typically 2x as fast as the stdlib deflate/gzip in its fastest mode. The compression ratio compared to stdlib is around level 3, but usually 3x as fast. -Compared to cgo zstd, the speed is around level 3 (default), but compression slightly worse, between level 1&2. - ### Usage @@ -140,7 +139,7 @@ I have collected some speed examples to compare speed and compression against ot * `file` is the input file. * `out` is the compressor used. `zskp` is this package. `zstd` is the Datadog cgo library. `gzstd/gzkp` is gzip standard and this library. -* `level` is the compression level used. For `zskp` level 1 is "fastest", level 2 is "default". +* `level` is the compression level used. For `zskp` level 1 is "fastest", level 2 is "default"; 3 is "better", 4 is "best". * `insize`/`outsize` is the input/output size. * `millis` is the number of milliseconds used for compression. * `mb/s` is megabytes (2^20 bytes) per second. @@ -154,11 +153,13 @@ file out level insize outsize millis mb/s silesia.tar zskp 1 211947520 73101992 643 313.87 silesia.tar zskp 2 211947520 67504318 969 208.38 silesia.tar zskp 3 211947520 65177448 1899 106.44 +silesia.tar zskp 4 211947520 61381950 8115 24.91 cgo zstd: silesia.tar zstd 1 211947520 73605392 543 371.56 silesia.tar zstd 3 211947520 66793289 864 233.68 silesia.tar zstd 6 211947520 62916450 1913 105.66 +silesia.tar zstd 9 211947520 60212393 5063 39.92 gzip, stdlib/this package: silesia.tar gzstd 1 211947520 80007735 1654 122.21 @@ -171,9 +172,11 @@ file out level insize outsize millis mb/s gob-stream zskp 1 1911399616 235022249 3088 590.30 gob-stream zskp 2 1911399616 205669791 3786 481.34 gob-stream zskp 3 1911399616 185792019 9324 195.48 +gob-stream zskp 4 1911399616 171537212 32113 56.76 gob-stream zstd 1 1911399616 249810424 2637 691.26 gob-stream zstd 3 1911399616 208192146 3490 522.31 gob-stream zstd 6 1911399616 193632038 6687 272.56 +gob-stream zstd 9 1911399616 177620386 16175 112.70 gob-stream gzstd 1 1911399616 357382641 10251 177.82 gob-stream gzkp 1 1911399616 362156523 5695 320.08 @@ -185,9 +188,11 @@ file out level insize outsize millis mb/s enwik9 zskp 1 1000000000 343848582 3609 264.18 enwik9 zskp 2 1000000000 317276632 5746 165.97 enwik9 zskp 3 1000000000 294540704 11725 81.34 +enwik9 zskp 4 1000000000 276609671 44029 21.66 enwik9 zstd 1 1000000000 358072021 3110 306.65 enwik9 zstd 3 1000000000 313734672 4784 199.35 enwik9 zstd 6 1000000000 295138875 10290 92.68 +enwik9 zstd 9 1000000000 278348700 28549 33.40 enwik9 gzstd 1 1000000000 382578136 9604 99.30 enwik9 gzkp 1 1000000000 383825945 6544 145.73 @@ -198,9 +203,11 @@ file out level insize outsize millis mb/s github-june-2days-2019.json zskp 1 6273951764 699045015 10620 563.40 github-june-2days-2019.json zskp 2 6273951764 617881763 11687 511.96 github-june-2days-2019.json zskp 3 6273951764 537511906 29252 204.54 +github-june-2days-2019.json zskp 4 6273951764 512796117 97791 61.18 github-june-2days-2019.json zstd 1 6273951764 766284037 8450 708.00 github-june-2days-2019.json zstd 3 6273951764 661889476 10927 547.57 github-june-2days-2019.json zstd 6 6273951764 642756859 22996 260.18 +github-june-2days-2019.json zstd 9 6273951764 601974523 52413 114.16 github-june-2days-2019.json gzstd 1 6273951764 1164400847 29948 199.79 github-june-2days-2019.json gzkp 1 6273951764 1128755542 19236 311.03 @@ -211,9 +218,11 @@ file out level insize outsize millis mb/s rawstudio-mint14.tar zskp 1 8558382592 3667489370 20210 403.84 rawstudio-mint14.tar zskp 2 8558382592 3364592300 31873 256.07 rawstudio-mint14.tar zskp 3 8558382592 3224594213 71751 113.75 +rawstudio-mint14.tar zskp 4 8558382592 3027332295 486243 16.79 rawstudio-mint14.tar zstd 1 8558382592 3609250104 17136 476.27 rawstudio-mint14.tar zstd 3 8558382592 3341679997 29262 278.92 rawstudio-mint14.tar zstd 6 8558382592 3235846406 77904 104.77 +rawstudio-mint14.tar zstd 9 8558382592 3160778861 140946 57.91 rawstudio-mint14.tar gzstd 1 8558382592 3926257486 57722 141.40 rawstudio-mint14.tar gzkp 1 8558382592 3970463184 41749 195.49 @@ -224,9 +233,11 @@ file out level insize outsize millis mb/s nyc-taxi-data-10M.csv zskp 1 3325605752 641339945 8925 355.35 nyc-taxi-data-10M.csv zskp 2 3325605752 591748091 11268 281.44 nyc-taxi-data-10M.csv zskp 3 3325605752 538490114 19880 159.53 +nyc-taxi-data-10M.csv zskp 4 3325605752 495986829 89368 35.49 nyc-taxi-data-10M.csv zstd 1 3325605752 687399637 8233 385.18 nyc-taxi-data-10M.csv zstd 3 3325605752 598514411 10065 315.07 nyc-taxi-data-10M.csv zstd 6 3325605752 570522953 20038 158.27 +nyc-taxi-data-10M.csv zstd 9 3325605752 517554797 64565 49.12 nyc-taxi-data-10M.csv gzstd 1 3325605752 928656485 23876 132.83 nyc-taxi-data-10M.csv gzkp 1 3325605752 924718719 16388 193.53 ``` |