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[chore]: Bump github.com/minio/minio-go/v7 from 7.0.48 to 7.0.49 (#1567)
Bumps [github.com/minio/minio-go/v7](https://github.com/minio/minio-go) from 7.0.48 to 7.0.49. - [Release notes](https://github.com/minio/minio-go/releases) - [Commits](https://github.com/minio/minio-go/compare/v7.0.48...v7.0.49) --- updated-dependencies: - dependency-name: github.com/minio/minio-go/v7 dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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vendor/github.com/klauspost/compress/s2/README.md
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@ -325,35 +325,35 @@ The content compressed in this mode is fully compatible with the standard decode
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Snappy vs S2 **compression** speed on 16 core (32 thread) computer, using all threads and a single thread (1 CPU):
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| File | S2 speed | S2 Throughput | S2 % smaller | S2 "better" | "better" throughput | "better" % smaller |
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|-----------------------------------------------------------------------------------------------------|----------|---------------|--------------|-------------|---------------------|--------------------|
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| [rawstudio-mint14.tar](https://files.klauspost.com/compress/rawstudio-mint14.7z) | 12.70x | 10556 MB/s | 7.35% | 4.15x | 3455 MB/s | 12.79% |
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| (1 CPU) | 1.14x | 948 MB/s | - | 0.42x | 349 MB/s | - |
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| [github-june-2days-2019.json](https://files.klauspost.com/compress/github-june-2days-2019.json.zst) | 17.13x | 14484 MB/s | 31.60% | 10.09x | 8533 MB/s | 37.71% |
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| (1 CPU) | 1.33x | 1127 MB/s | - | 0.70x | 589 MB/s | - |
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| [github-ranks-backup.bin](https://files.klauspost.com/compress/github-ranks-backup.bin.zst) | 15.14x | 12000 MB/s | -5.79% | 6.59x | 5223 MB/s | 5.80% |
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| (1 CPU) | 1.11x | 877 MB/s | - | 0.47x | 370 MB/s | - |
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| [consensus.db.10gb](https://files.klauspost.com/compress/consensus.db.10gb.zst) | 14.62x | 12116 MB/s | 15.90% | 5.35x | 4430 MB/s | 16.08% |
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| (1 CPU) | 1.38x | 1146 MB/s | - | 0.38x | 312 MB/s | - |
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| [adresser.json](https://files.klauspost.com/compress/adresser.json.zst) | 8.83x | 17579 MB/s | 43.86% | 6.54x | 13011 MB/s | 47.23% |
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| (1 CPU) | 1.14x | 2259 MB/s | - | 0.74x | 1475 MB/s | - |
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| [gob-stream](https://files.klauspost.com/compress/gob-stream.7z) | 16.72x | 14019 MB/s | 24.02% | 10.11x | 8477 MB/s | 30.48% |
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| (1 CPU) | 1.24x | 1043 MB/s | - | 0.70x | 586 MB/s | - |
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| [10gb.tar](http://mattmahoney.net/dc/10gb.html) | 13.33x | 9254 MB/s | 1.84% | 6.75x | 4686 MB/s | 6.72% |
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| (1 CPU) | 0.97x | 672 MB/s | - | 0.53x | 366 MB/s | - |
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| sharnd.out.2gb | 2.11x | 12639 MB/s | 0.01% | 1.98x | 11833 MB/s | 0.01% |
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| (1 CPU) | 0.93x | 5594 MB/s | - | 1.34x | 8030 MB/s | - |
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| [enwik9](http://mattmahoney.net/dc/textdata.html) | 19.34x | 8220 MB/s | 3.98% | 7.87x | 3345 MB/s | 15.82% |
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| (1 CPU) | 1.06x | 452 MB/s | - | 0.50x | 213 MB/s | - |
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| [silesia.tar](http://sun.aei.polsl.pl/~sdeor/corpus/silesia.zip) | 10.48x | 6124 MB/s | 5.67% | 3.76x | 2197 MB/s | 12.60% |
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| (1 CPU) | 0.97x | 568 MB/s | - | 0.46x | 271 MB/s | - |
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| [enwik10](https://encode.su/threads/3315-enwik10-benchmark-results) | 21.07x | 9020 MB/s | 6.36% | 6.91x | 2959 MB/s | 16.95% |
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| (1 CPU) | 1.07x | 460 MB/s | - | 0.51x | 220 MB/s | - |
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| File | S2 Speed | S2 Throughput | S2 % smaller | S2 "better" | "better" throughput | "better" % smaller |
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|---------------------------------------------------------------------------------------------------------|----------|---------------|--------------|-------------|---------------------|--------------------|
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| [rawstudio-mint14.tar](https://files.klauspost.com/compress/rawstudio-mint14.7z) | 16.33x | 10556 MB/s | 8.0% | 6.04x | 5252 MB/s | 14.7% |
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| (1 CPU) | 1.08x | 940 MB/s | - | 0.46x | 400 MB/s | - |
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| [github-june-2days-2019.json](https://files.klauspost.com/compress/github-june-2days-2019.json.zst) | 16.51x | 15224 MB/s | 31.70% | 9.47x | 8734 MB/s | 37.71% |
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| (1 CPU) | 1.26x | 1157 MB/s | - | 0.60x | 556 MB/s | - |
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| [github-ranks-backup.bin](https://files.klauspost.com/compress/github-ranks-backup.bin.zst) | 15.14x | 12598 MB/s | -5.76% | 6.23x | 5675 MB/s | 3.62% |
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| (1 CPU) | 1.02x | 932 MB/s | - | 0.47x | 432 MB/s | - |
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| [consensus.db.10gb](https://files.klauspost.com/compress/consensus.db.10gb.zst) | 11.21x | 12116 MB/s | 15.95% | 3.24x | 3500 MB/s | 18.00% |
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| (1 CPU) | 1.05x | 1135 MB/s | - | 0.27x | 292 MB/s | - |
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| [apache.log](https://files.klauspost.com/compress/apache.log.zst) | 8.55x | 16673 MB/s | 20.54% | 5.85x | 11420 MB/s | 24.97% |
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| (1 CPU) | 1.91x | 1771 MB/s | - | 0.53x | 1041 MB/s | - |
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| [gob-stream](https://files.klauspost.com/compress/gob-stream.7z) | 15.76x | 14357 MB/s | 24.01% | 8.67x | 7891 MB/s | 33.68% |
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| (1 CPU) | 1.17x | 1064 MB/s | - | 0.65x | 595 MB/s | - |
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| [10gb.tar](http://mattmahoney.net/dc/10gb.html) | 13.33x | 9835 MB/s | 2.34% | 6.85x | 4863 MB/s | 9.96% |
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| (1 CPU) | 0.97x | 689 MB/s | - | 0.55x | 387 MB/s | - |
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| sharnd.out.2gb | 9.11x | 13213 MB/s | 0.01% | 1.49x | 9184 MB/s | 0.01% |
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| (1 CPU) | 0.88x | 5418 MB/s | - | 0.77x | 5417 MB/s | - |
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| [sofia-air-quality-dataset csv](https://files.klauspost.com/compress/sofia-air-quality-dataset.tar.zst) | 22.00x | 11477 MB/s | 18.73% | 11.15x | 5817 MB/s | 27.88% |
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| (1 CPU) | 1.23x | 642 MB/s | - | 0.71x | 642 MB/s | - |
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| [silesia.tar](http://sun.aei.polsl.pl/~sdeor/corpus/silesia.zip) | 11.23x | 6520 MB/s | 5.9% | 5.35x | 3109 MB/s | 15.88% |
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| (1 CPU) | 1.05x | 607 MB/s | - | 0.52x | 304 MB/s | - |
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| [enwik9](https://files.klauspost.com/compress/enwik9.zst) | 19.28x | 8440 MB/s | 4.04% | 9.31x | 4076 MB/s | 18.04% |
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| (1 CPU) | 1.12x | 488 MB/s | - | 0.57x | 250 MB/s | - |
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### Legend
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* `S2 speed`: Speed of S2 compared to Snappy, using 16 cores and 1 core.
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* `S2 throughput`: Throughput of S2 in MB/s.
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* `S2 Speed`: Speed of S2 compared to Snappy, using 16 cores and 1 core.
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* `S2 Throughput`: Throughput of S2 in MB/s.
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* `S2 % smaller`: How many percent of the Snappy output size is S2 better.
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* `S2 "better"`: Speed when enabling "better" compression mode in S2 compared to Snappy.
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* `"better" throughput`: Speed when enabling "better" compression mode in S2 compared to Snappy.
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@ -361,7 +361,7 @@ Snappy vs S2 **compression** speed on 16 core (32 thread) computer, using all th
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There is a good speedup across the board when using a single thread and a significant speedup when using multiple threads.
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Machine generated data gets by far the biggest compression boost, with size being being reduced by up to 45% of Snappy size.
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Machine generated data gets by far the biggest compression boost, with size being reduced by up to 35% of Snappy size.
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The "better" compression mode sees a good improvement in all cases, but usually at a performance cost.
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@ -404,15 +404,15 @@ The "better" compression mode will actively look for shorter matches, which is w
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Without assembly decompression is also very fast; single goroutine decompression speed. No assembly:
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| File | S2 Throughput | S2 throughput |
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|--------------------------------|--------------|---------------|
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| consensus.db.10gb.s2 | 1.84x | 2289.8 MB/s |
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| 10gb.tar.s2 | 1.30x | 867.07 MB/s |
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| rawstudio-mint14.tar.s2 | 1.66x | 1329.65 MB/s |
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| github-june-2days-2019.json.s2 | 2.36x | 1831.59 MB/s |
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| github-ranks-backup.bin.s2 | 1.73x | 1390.7 MB/s |
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| enwik9.s2 | 1.67x | 681.53 MB/s |
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| adresser.json.s2 | 3.41x | 4230.53 MB/s |
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| silesia.tar.s2 | 1.52x | 811.58 |
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|--------------------------------|---------------|---------------|
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| consensus.db.10gb.s2 | 1.84x | 2289.8 MB/s |
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| 10gb.tar.s2 | 1.30x | 867.07 MB/s |
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| rawstudio-mint14.tar.s2 | 1.66x | 1329.65 MB/s |
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| github-june-2days-2019.json.s2 | 2.36x | 1831.59 MB/s |
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| github-ranks-backup.bin.s2 | 1.73x | 1390.7 MB/s |
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| enwik9.s2 | 1.67x | 681.53 MB/s |
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| adresser.json.s2 | 3.41x | 4230.53 MB/s |
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| silesia.tar.s2 | 1.52x | 811.58 |
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Even though S2 typically compresses better than Snappy, decompression speed is always better.
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@ -450,14 +450,14 @@ The most reliable is a wide dataset.
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For this we use [`webdevdata.org-2015-01-07-subset`](https://files.klauspost.com/compress/webdevdata.org-2015-01-07-4GB-subset.7z),
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53927 files, total input size: 4,014,735,833 bytes. Single goroutine used.
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| * | Input | Output | Reduction | MB/s |
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|-------------------|------------|------------|-----------|--------|
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| S2 | 4014735833 | 1059723369 | 73.60% | **934.34** |
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| S2 Better | 4014735833 | 969670507 | 75.85% | 532.70 |
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| S2 Best | 4014735833 | 906625668 | **77.85%** | 46.84 |
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| Snappy | 4014735833 | 1128706759 | 71.89% | 762.59 |
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| S2, Snappy Output | 4014735833 | 1093821420 | 72.75% | 908.60 |
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| LZ4 | 4014735833 | 1079259294 | 73.12% | 526.94 |
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| * | Input | Output | Reduction | MB/s |
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|-------------------|------------|------------|------------|------------|
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| S2 | 4014735833 | 1059723369 | 73.60% | **936.73** |
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| S2 Better | 4014735833 | 961580539 | 76.05% | 451.10 |
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| S2 Best | 4014735833 | 899182886 | **77.60%** | 46.84 |
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| Snappy | 4014735833 | 1128706759 | 71.89% | 790.15 |
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| S2, Snappy Output | 4014735833 | 1093823291 | 72.75% | 936.60 |
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| LZ4 | 4014735833 | 1063768713 | 73.50% | 452.02 |
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S2 delivers both the best single threaded throughput with regular mode and the best compression rate with "best".
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"Better" mode provides the same compression speed as LZ4 with better compression ratio.
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@ -489,43 +489,24 @@ AMD64 assembly is use for both S2 and Snappy.
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| Absolute Perf | Snappy size | S2 Size | Snappy Speed | S2 Speed | Snappy dec | S2 dec |
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|-----------------------|-------------|---------|--------------|-------------|-------------|-------------|
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| html | 22843 | 21111 | 16246 MB/s | 17438 MB/s | 40972 MB/s | 49263 MB/s |
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| urls.10K | 335492 | 287326 | 7943 MB/s | 9693 MB/s | 22523 MB/s | 26484 MB/s |
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| fireworks.jpeg | 123034 | 123100 | 349544 MB/s | 273889 MB/s | 718321 MB/s | 827552 MB/s |
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| fireworks.jpeg (200B) | 146 | 155 | 8869 MB/s | 17773 MB/s | 33691 MB/s | 52421 MB/s |
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| paper-100k.pdf | 85304 | 84459 | 167546 MB/s | 101263 MB/s | 326905 MB/s | 291944 MB/s |
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| html_x_4 | 92234 | 21113 | 15194 MB/s | 50670 MB/s | 30843 MB/s | 32217 MB/s |
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| alice29.txt | 88034 | 85975 | 5936 MB/s | 6139 MB/s | 12882 MB/s | 20044 MB/s |
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| asyoulik.txt | 77503 | 79650 | 5517 MB/s | 6366 MB/s | 12735 MB/s | 22806 MB/s |
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| lcet10.txt | 234661 | 220670 | 6235 MB/s | 6067 MB/s | 14519 MB/s | 18697 MB/s |
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| plrabn12.txt | 319267 | 317985 | 5159 MB/s | 5726 MB/s | 11923 MB/s | 19901 MB/s |
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| geo.protodata | 23335 | 18690 | 21220 MB/s | 26529 MB/s | 56271 MB/s | 62540 MB/s |
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| kppkn.gtb | 69526 | 65312 | 9732 MB/s | 8559 MB/s | 18491 MB/s | 18969 MB/s |
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| alice29.txt (128B) | 80 | 82 | 6691 MB/s | 15489 MB/s | 31883 MB/s | 38874 MB/s |
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| alice29.txt (1000B) | 774 | 774 | 12204 MB/s | 13000 MB/s | 48056 MB/s | 52341 MB/s |
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| alice29.txt (10000B) | 6648 | 6933 | 10044 MB/s | 12806 MB/s | 32378 MB/s | 46322 MB/s |
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| alice29.txt (20000B) | 12686 | 13574 | 7733 MB/s | 11210 MB/s | 30566 MB/s | 58969 MB/s |
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| html | 22843 | 20868 | 16246 MB/s | 18617 MB/s | 40972 MB/s | 49263 MB/s |
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| urls.10K | 335492 | 286541 | 7943 MB/s | 10201 MB/s | 22523 MB/s | 26484 MB/s |
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| fireworks.jpeg | 123034 | 123100 | 349544 MB/s | 303228 MB/s | 718321 MB/s | 827552 MB/s |
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| fireworks.jpeg (200B) | 146 | 155 | 8869 MB/s | 20180 MB/s | 33691 MB/s | 52421 MB/s |
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| paper-100k.pdf | 85304 | 84202 | 167546 MB/s | 112988 MB/s | 326905 MB/s | 291944 MB/s |
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| html_x_4 | 92234 | 20870 | 15194 MB/s | 54457 MB/s | 30843 MB/s | 32217 MB/s |
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| alice29.txt | 88034 | 85934 | 5936 MB/s | 6540 MB/s | 12882 MB/s | 20044 MB/s |
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| asyoulik.txt | 77503 | 79575 | 5517 MB/s | 6657 MB/s | 12735 MB/s | 22806 MB/s |
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| lcet10.txt | 234661 | 220383 | 6235 MB/s | 6303 MB/s | 14519 MB/s | 18697 MB/s |
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| plrabn12.txt | 319267 | 318196 | 5159 MB/s | 6074 MB/s | 11923 MB/s | 19901 MB/s |
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| geo.protodata | 23335 | 18606 | 21220 MB/s | 25432 MB/s | 56271 MB/s | 62540 MB/s |
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| kppkn.gtb | 69526 | 65019 | 9732 MB/s | 8905 MB/s | 18491 MB/s | 18969 MB/s |
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| alice29.txt (128B) | 80 | 82 | 6691 MB/s | 17179 MB/s | 31883 MB/s | 38874 MB/s |
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| alice29.txt (1000B) | 774 | 774 | 12204 MB/s | 13273 MB/s | 48056 MB/s | 52341 MB/s |
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| alice29.txt (10000B) | 6648 | 6933 | 10044 MB/s | 12824 MB/s | 32378 MB/s | 46322 MB/s |
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| alice29.txt (20000B) | 12686 | 13516 | 7733 MB/s | 12160 MB/s | 30566 MB/s | 58969 MB/s |
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| Relative Perf | Snappy size | S2 size improved | S2 Speed | S2 Dec Speed |
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|-----------------------|-------------|------------------|----------|--------------|
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| html | 22.31% | 7.58% | 1.07x | 1.20x |
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| urls.10K | 47.78% | 14.36% | 1.22x | 1.18x |
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| fireworks.jpeg | 99.95% | -0.05% | 0.78x | 1.15x |
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| fireworks.jpeg (200B) | 73.00% | -6.16% | 2.00x | 1.56x |
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| paper-100k.pdf | 83.30% | 0.99% | 0.60x | 0.89x |
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| html_x_4 | 22.52% | 77.11% | 3.33x | 1.04x |
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| alice29.txt | 57.88% | 2.34% | 1.03x | 1.56x |
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| asyoulik.txt | 61.91% | -2.77% | 1.15x | 1.79x |
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| lcet10.txt | 54.99% | 5.96% | 0.97x | 1.29x |
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| plrabn12.txt | 66.26% | 0.40% | 1.11x | 1.67x |
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| geo.protodata | 19.68% | 19.91% | 1.25x | 1.11x |
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| kppkn.gtb | 37.72% | 6.06% | 0.88x | 1.03x |
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| alice29.txt (128B) | 62.50% | -2.50% | 2.31x | 1.22x |
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| alice29.txt (1000B) | 77.40% | 0.00% | 1.07x | 1.09x |
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| alice29.txt (10000B) | 66.48% | -4.29% | 1.27x | 1.43x |
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| alice29.txt (20000B) | 63.43% | -7.00% | 1.45x | 1.93x |
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Speed is generally at or above Snappy. Small blocks gets a significant speedup, although at the expense of size.
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Decompression speed is better than Snappy, except in one case.
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@ -543,43 +524,24 @@ So individual benchmarks should only be seen as a guideline and the overall pict
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| Absolute Perf | Snappy size | Better Size | Snappy Speed | Better Speed | Snappy dec | Better dec |
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|-----------------------|-------------|-------------|--------------|--------------|-------------|-------------|
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| html | 22843 | 19833 | 16246 MB/s | 7731 MB/s | 40972 MB/s | 40292 MB/s |
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| urls.10K | 335492 | 253529 | 7943 MB/s | 3980 MB/s | 22523 MB/s | 20981 MB/s |
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| fireworks.jpeg | 123034 | 123100 | 349544 MB/s | 9760 MB/s | 718321 MB/s | 823698 MB/s |
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| fireworks.jpeg (200B) | 146 | 142 | 8869 MB/s | 594 MB/s | 33691 MB/s | 30101 MB/s |
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| paper-100k.pdf | 85304 | 82915 | 167546 MB/s | 7470 MB/s | 326905 MB/s | 198869 MB/s |
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| html_x_4 | 92234 | 19841 | 15194 MB/s | 23403 MB/s | 30843 MB/s | 30937 MB/s |
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| alice29.txt | 88034 | 73218 | 5936 MB/s | 2945 MB/s | 12882 MB/s | 16611 MB/s |
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| asyoulik.txt | 77503 | 66844 | 5517 MB/s | 2739 MB/s | 12735 MB/s | 14975 MB/s |
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| lcet10.txt | 234661 | 190589 | 6235 MB/s | 3099 MB/s | 14519 MB/s | 16634 MB/s |
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| plrabn12.txt | 319267 | 270828 | 5159 MB/s | 2600 MB/s | 11923 MB/s | 13382 MB/s |
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| geo.protodata | 23335 | 18278 | 21220 MB/s | 11208 MB/s | 56271 MB/s | 57961 MB/s |
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| kppkn.gtb | 69526 | 61851 | 9732 MB/s | 4556 MB/s | 18491 MB/s | 16524 MB/s |
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| alice29.txt (128B) | 80 | 81 | 6691 MB/s | 529 MB/s | 31883 MB/s | 34225 MB/s |
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| alice29.txt (1000B) | 774 | 748 | 12204 MB/s | 1943 MB/s | 48056 MB/s | 42068 MB/s |
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| alice29.txt (10000B) | 6648 | 6234 | 10044 MB/s | 2949 MB/s | 32378 MB/s | 28813 MB/s |
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| alice29.txt (20000B) | 12686 | 11584 | 7733 MB/s | 2822 MB/s | 30566 MB/s | 27315 MB/s |
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| html | 22843 | 18972 | 16246 MB/s | 8621 MB/s | 40972 MB/s | 40292 MB/s |
|
||||
| urls.10K | 335492 | 248079 | 7943 MB/s | 5104 MB/s | 22523 MB/s | 20981 MB/s |
|
||||
| fireworks.jpeg | 123034 | 123100 | 349544 MB/s | 84429 MB/s | 718321 MB/s | 823698 MB/s |
|
||||
| fireworks.jpeg (200B) | 146 | 149 | 8869 MB/s | 7125 MB/s | 33691 MB/s | 30101 MB/s |
|
||||
| paper-100k.pdf | 85304 | 82887 | 167546 MB/s | 11087 MB/s | 326905 MB/s | 198869 MB/s |
|
||||
| html_x_4 | 92234 | 18982 | 15194 MB/s | 29316 MB/s | 30843 MB/s | 30937 MB/s |
|
||||
| alice29.txt | 88034 | 71611 | 5936 MB/s | 3709 MB/s | 12882 MB/s | 16611 MB/s |
|
||||
| asyoulik.txt | 77503 | 65941 | 5517 MB/s | 3380 MB/s | 12735 MB/s | 14975 MB/s |
|
||||
| lcet10.txt | 234661 | 184939 | 6235 MB/s | 3537 MB/s | 14519 MB/s | 16634 MB/s |
|
||||
| plrabn12.txt | 319267 | 264990 | 5159 MB/s | 2960 MB/s | 11923 MB/s | 13382 MB/s |
|
||||
| geo.protodata | 23335 | 17689 | 21220 MB/s | 10859 MB/s | 56271 MB/s | 57961 MB/s |
|
||||
| kppkn.gtb | 69526 | 55398 | 9732 MB/s | 5206 MB/s | 18491 MB/s | 16524 MB/s |
|
||||
| alice29.txt (128B) | 80 | 78 | 6691 MB/s | 7422 MB/s | 31883 MB/s | 34225 MB/s |
|
||||
| alice29.txt (1000B) | 774 | 746 | 12204 MB/s | 5734 MB/s | 48056 MB/s | 42068 MB/s |
|
||||
| alice29.txt (10000B) | 6648 | 6218 | 10044 MB/s | 6055 MB/s | 32378 MB/s | 28813 MB/s |
|
||||
| alice29.txt (20000B) | 12686 | 11492 | 7733 MB/s | 3143 MB/s | 30566 MB/s | 27315 MB/s |
|
||||
|
||||
|
||||
| Relative Perf | Snappy size | Better size | Better Speed | Better dec |
|
||||
|-----------------------|-------------|-------------|--------------|------------|
|
||||
| html | 22.31% | 13.18% | 0.48x | 0.98x |
|
||||
| urls.10K | 47.78% | 24.43% | 0.50x | 0.93x |
|
||||
| fireworks.jpeg | 99.95% | -0.05% | 0.03x | 1.15x |
|
||||
| fireworks.jpeg (200B) | 73.00% | 2.74% | 0.07x | 0.89x |
|
||||
| paper-100k.pdf | 83.30% | 2.80% | 0.07x | 0.61x |
|
||||
| html_x_4 | 22.52% | 78.49% | 0.04x | 1.00x |
|
||||
| alice29.txt | 57.88% | 16.83% | 1.54x | 1.29x |
|
||||
| asyoulik.txt | 61.91% | 13.75% | 0.50x | 1.18x |
|
||||
| lcet10.txt | 54.99% | 18.78% | 0.50x | 1.15x |
|
||||
| plrabn12.txt | 66.26% | 15.17% | 0.50x | 1.12x |
|
||||
| geo.protodata | 19.68% | 21.67% | 0.50x | 1.03x |
|
||||
| kppkn.gtb | 37.72% | 11.04% | 0.53x | 0.89x |
|
||||
| alice29.txt (128B) | 62.50% | -1.25% | 0.47x | 1.07x |
|
||||
| alice29.txt (1000B) | 77.40% | 3.36% | 0.08x | 0.88x |
|
||||
| alice29.txt (10000B) | 66.48% | 6.23% | 0.16x | 0.89x |
|
||||
| alice29.txt (20000B) | 63.43% | 8.69% | 0.29x | 0.89x |
|
||||
|
||||
Except for the mostly incompressible JPEG image compression is better and usually in the
|
||||
double digits in terms of percentage reduction over Snappy.
|
||||
|
||||
|
|
@ -605,29 +567,29 @@ Some examples compared on 16 core CPU, amd64 assembly used:
|
|||
|
||||
```
|
||||
* enwik10
|
||||
Default... 10000000000 -> 4761467548 [47.61%]; 1.098s, 8685.6MB/s
|
||||
Better... 10000000000 -> 4219438251 [42.19%]; 1.925s, 4954.2MB/s
|
||||
Best... 10000000000 -> 3627364337 [36.27%]; 43.051s, 221.5MB/s
|
||||
Default... 10000000000 -> 4759950115 [47.60%]; 1.03s, 9263.0MB/s
|
||||
Better... 10000000000 -> 4084706676 [40.85%]; 2.16s, 4415.4MB/s
|
||||
Best... 10000000000 -> 3615520079 [36.16%]; 42.259s, 225.7MB/s
|
||||
|
||||
* github-june-2days-2019.json
|
||||
Default... 6273951764 -> 1043196283 [16.63%]; 431ms, 13882.3MB/s
|
||||
Better... 6273951764 -> 949146808 [15.13%]; 547ms, 10938.4MB/s
|
||||
Best... 6273951764 -> 832855506 [13.27%]; 9.455s, 632.8MB/s
|
||||
Default... 6273951764 -> 1041700255 [16.60%]; 431ms, 13882.3MB/s
|
||||
Better... 6273951764 -> 945841238 [15.08%]; 547ms, 10938.4MB/s
|
||||
Best... 6273951764 -> 826392576 [13.17%]; 9.455s, 632.8MB/s
|
||||
|
||||
* nyc-taxi-data-10M.csv
|
||||
Default... 3325605752 -> 1095998837 [32.96%]; 324ms, 9788.7MB/s
|
||||
Better... 3325605752 -> 954776589 [28.71%]; 491ms, 6459.4MB/s
|
||||
Best... 3325605752 -> 779098746 [23.43%]; 8.29s, 382.6MB/s
|
||||
Default... 3325605752 -> 1093516949 [32.88%]; 324ms, 9788.7MB/s
|
||||
Better... 3325605752 -> 885394158 [26.62%]; 491ms, 6459.4MB/s
|
||||
Best... 3325605752 -> 773681257 [23.26%]; 8.29s, 412.0MB/s
|
||||
|
||||
* 10gb.tar
|
||||
Default... 10065157632 -> 5916578242 [58.78%]; 1.028s, 9337.4MB/s
|
||||
Better... 10065157632 -> 5649207485 [56.13%]; 1.597s, 6010.6MB/s
|
||||
Best... 10065157632 -> 5208719802 [51.75%]; 32.78s, 292.8MB/
|
||||
Default... 10065157632 -> 5915541066 [58.77%]; 1.028s, 9337.4MB/s
|
||||
Better... 10065157632 -> 5453844650 [54.19%]; 1.597s, 4862.7MB/s
|
||||
Best... 10065157632 -> 5192495021 [51.59%]; 32.78s, 308.2MB/
|
||||
|
||||
* consensus.db.10gb
|
||||
Default... 10737418240 -> 4562648848 [42.49%]; 882ms, 11610.0MB/s
|
||||
Better... 10737418240 -> 4542428129 [42.30%]; 1.533s, 6679.7MB/s
|
||||
Best... 10737418240 -> 4244773384 [39.53%]; 42.96s, 238.4MB/s
|
||||
Default... 10737418240 -> 4549762344 [42.37%]; 882ms, 12118.4MB/s
|
||||
Better... 10737418240 -> 4438535064 [41.34%]; 1.533s, 3500.9MB/s
|
||||
Best... 10737418240 -> 4210602774 [39.21%]; 42.96s, 254.4MB/s
|
||||
```
|
||||
|
||||
Decompression speed should be around the same as using the 'better' compression mode.
|
||||
|
|
@ -648,10 +610,10 @@ If you would like more control, you can use the s2 package as described below:
|
|||
Snappy compatible blocks can be generated with the S2 encoder.
|
||||
Compression and speed is typically a bit better `MaxEncodedLen` is also smaller for smaller memory usage. Replace
|
||||
|
||||
| Snappy | S2 replacement |
|
||||
|----------------------------|-------------------------|
|
||||
| snappy.Encode(...) | s2.EncodeSnappy(...) |
|
||||
| snappy.MaxEncodedLen(...) | s2.MaxEncodedLen(...) |
|
||||
| Snappy | S2 replacement |
|
||||
|---------------------------|-----------------------|
|
||||
| snappy.Encode(...) | s2.EncodeSnappy(...) |
|
||||
| snappy.MaxEncodedLen(...) | s2.MaxEncodedLen(...) |
|
||||
|
||||
`s2.EncodeSnappy` can be replaced with `s2.EncodeSnappyBetter` or `s2.EncodeSnappyBest` to get more efficiently compressed snappy compatible output.
|
||||
|
||||
|
|
@ -660,12 +622,12 @@ Compression and speed is typically a bit better `MaxEncodedLen` is also smaller
|
|||
Comparison of [`webdevdata.org-2015-01-07-subset`](https://files.klauspost.com/compress/webdevdata.org-2015-01-07-4GB-subset.7z),
|
||||
53927 files, total input size: 4,014,735,833 bytes. amd64, single goroutine used:
|
||||
|
||||
| Encoder | Size | MB/s | Reduction |
|
||||
|-----------------------|------------|------------|------------
|
||||
| snappy.Encode | 1128706759 | 725.59 | 71.89% |
|
||||
| s2.EncodeSnappy | 1093823291 | **899.16** | 72.75% |
|
||||
| s2.EncodeSnappyBetter | 1001158548 | 578.49 | 75.06% |
|
||||
| s2.EncodeSnappyBest | 944507998 | 66.00 | **76.47%**|
|
||||
| Encoder | Size | MB/s | Reduction |
|
||||
|-----------------------|------------|------------|------------|
|
||||
| snappy.Encode | 1128706759 | 725.59 | 71.89% |
|
||||
| s2.EncodeSnappy | 1093823291 | **899.16** | 72.75% |
|
||||
| s2.EncodeSnappyBetter | 1001158548 | 578.49 | 75.06% |
|
||||
| s2.EncodeSnappyBest | 944507998 | 66.00 | **76.47%** |
|
||||
|
||||
## Streams
|
||||
|
||||
|
|
@ -835,6 +797,13 @@ This is done using the regular "Skip" function:
|
|||
|
||||
This will ensure that we are at exactly the offset we want, and reading from `dec` will start at the requested offset.
|
||||
|
||||
# Compact storage
|
||||
|
||||
For compact storage [RemoveIndexHeaders](https://pkg.go.dev/github.com/klauspost/compress/s2#RemoveIndexHeaders) can be used to remove any redundant info from
|
||||
a serialized index. If you remove the header it must be restored before [Loading](https://pkg.go.dev/github.com/klauspost/compress/s2#Index.Load).
|
||||
|
||||
This is expected to save 20 bytes. These can be restored using [RestoreIndexHeaders](https://pkg.go.dev/github.com/klauspost/compress/s2#RestoreIndexHeaders). This removes a layer of security, but is the most compact representation. Returns nil if headers contains errors.
|
||||
|
||||
## Index Format:
|
||||
|
||||
Each block is structured as a snappy skippable block, with the chunk ID 0x99.
|
||||
|
|
@ -844,20 +813,20 @@ The block can be read from the front, but contains information so it can be read
|
|||
Numbers are stored as fixed size little endian values or [zigzag encoded](https://developers.google.com/protocol-buffers/docs/encoding#signed_integers) [base 128 varints](https://developers.google.com/protocol-buffers/docs/encoding),
|
||||
with un-encoded value length of 64 bits, unless other limits are specified.
|
||||
|
||||
| Content | Format |
|
||||
|---------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------|
|
||||
| ID, `[1]byte` | Always 0x99. |
|
||||
| Data Length, `[3]byte` | 3 byte little-endian length of the chunk in bytes, following this. |
|
||||
| Header `[6]byte` | Header, must be `[115, 50, 105, 100, 120, 0]` or in text: "s2idx\x00". |
|
||||
| UncompressedSize, Varint | Total Uncompressed size. |
|
||||
| CompressedSize, Varint | Total Compressed size if known. Should be -1 if unknown. |
|
||||
| EstBlockSize, Varint | Block Size, used for guessing uncompressed offsets. Must be >= 0. |
|
||||
| Entries, Varint | Number of Entries in index, must be < 65536 and >=0. |
|
||||
| HasUncompressedOffsets `byte` | 0 if no uncompressed offsets are present, 1 if present. Other values are invalid. |
|
||||
| UncompressedOffsets, [Entries]VarInt | Uncompressed offsets. See below how to decode. |
|
||||
| CompressedOffsets, [Entries]VarInt | Compressed offsets. See below how to decode. |
|
||||
| Block Size, `[4]byte` | Little Endian total encoded size (including header and trailer). Can be used for searching backwards to start of block. |
|
||||
| Trailer `[6]byte` | Trailer, must be `[0, 120, 100, 105, 50, 115]` or in text: "\x00xdi2s". Can be used for identifying block from end of stream. |
|
||||
| Content | Format |
|
||||
|--------------------------------------|-------------------------------------------------------------------------------------------------------------------------------|
|
||||
| ID, `[1]byte` | Always 0x99. |
|
||||
| Data Length, `[3]byte` | 3 byte little-endian length of the chunk in bytes, following this. |
|
||||
| Header `[6]byte` | Header, must be `[115, 50, 105, 100, 120, 0]` or in text: "s2idx\x00". |
|
||||
| UncompressedSize, Varint | Total Uncompressed size. |
|
||||
| CompressedSize, Varint | Total Compressed size if known. Should be -1 if unknown. |
|
||||
| EstBlockSize, Varint | Block Size, used for guessing uncompressed offsets. Must be >= 0. |
|
||||
| Entries, Varint | Number of Entries in index, must be < 65536 and >=0. |
|
||||
| HasUncompressedOffsets `byte` | 0 if no uncompressed offsets are present, 1 if present. Other values are invalid. |
|
||||
| UncompressedOffsets, [Entries]VarInt | Uncompressed offsets. See below how to decode. |
|
||||
| CompressedOffsets, [Entries]VarInt | Compressed offsets. See below how to decode. |
|
||||
| Block Size, `[4]byte` | Little Endian total encoded size (including header and trailer). Can be used for searching backwards to start of block. |
|
||||
| Trailer `[6]byte` | Trailer, must be `[0, 120, 100, 105, 50, 115]` or in text: "\x00xdi2s". Can be used for identifying block from end of stream. |
|
||||
|
||||
For regular streams the uncompressed offsets are fully predictable,
|
||||
so `HasUncompressedOffsets` allows to specify that compressed blocks all have
|
||||
|
|
@ -929,6 +898,7 @@ To decode from any given uncompressed offset `(wantOffset)`:
|
|||
|
||||
See [using indexes](https://github.com/klauspost/compress/tree/master/s2#using-indexes) for functions that perform the operations with a simpler interface.
|
||||
|
||||
|
||||
# Format Extensions
|
||||
|
||||
* Frame [Stream identifier](https://github.com/google/snappy/blob/master/framing_format.txt#L68) changed from `sNaPpY` to `S2sTwO`.
|
||||
|
|
@ -951,10 +921,11 @@ The length is specified by reading the 3-bit length specified in the tag and dec
|
|||
| 7 | 65540 + read 3 bytes |
|
||||
|
||||
This allows any repeat offset + length to be represented by 2 to 5 bytes.
|
||||
It also allows to emit matches longer than 64 bytes with one copy + one repeat instead of several 64 byte copies.
|
||||
|
||||
Lengths are stored as little endian values.
|
||||
|
||||
The first copy of a block cannot be a repeat offset and the offset is not carried across blocks in streams.
|
||||
The first copy of a block cannot be a repeat offset and the offset is reset on every block in streams.
|
||||
|
||||
Default streaming block size is 1MB.
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue