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updated results in zlibWrapper\README.md

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inikep 2016-09-26 22:11:08 +02:00
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zlibWrapper/README.md
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@ -101,21 +101,21 @@ The speed of compression can be improved with reusing a single context with foll
- for the 2nd file call `deflateReset`, `deflate`, `...`, `deflate`
- free the context with `deflateEnd`
To check the difference we made experiments using `zwrapbench` with zstd and zlib compression (both at level 3) with 4 KB blocks.
The input data was git repository downloaded from https://github.com/git/git/archive/master.zip and converted to uncompressed tarball.
To check the difference we made experiments using `zwrapbench -ri6b6` with zstd and zlib compression (both at level 6).
The input data was decompressed git repository downloaded from https://github.com/git/git/archive/master.zip that contains 2979 files.
The table below shows that reusing contexts has a minor influence on zlib but it gives improvement for zstd.
In our example (the last 2 lines) it gives 15% better compression speed and 6% better decompression speed.
In our example (the last 2 lines) it gives 4% better compression speed and 5% better decompression speed.
| Compression type | Compression | Decompress.| Compr. size | Ratio |
| ------------------------------------------------- | ------------| -----------| ----------- | ----- |
| zlib 1.2.8 | 54.77 MB/s | 176.2 MB/s | 8928115 | 2.910 |
| zlib 1.2.8 not reusing a context | 54.98 MB/s | 174.6 MB/s | 8928115 | 2.910 |
| zlib 1.2.8 with zlibWrapper and reusing a context | 55.16 MB/s | 176.8 MB/s | 8928115 | 2.910 |
| zlib 1.2.8 with zlibWrapper not reusing a context | 54.11 MB/s | 174.5 MB/s | 8928115 | 2.910 |
| zstd 1.1.0 using ZSTD_CCtx | 108.03 MB/s | 319.8 MB/s | 8962336 | 2.899 |
| zstd 1.1.0 using ZSTD_CStream | 107.34 MB/s | 307.3 MB/s | 8981368 | 2.893 |
| zstd 1.1.0 with zlibWrapper and reusing a context | 107.52 MB/s | 297.3 MB/s | 8981368 | 2.893 |
| zstd 1.1.0 with zlibWrapper not reusing a context | 91.45 MB/s | 279.8 MB/s | 8981368 | 2.893 |
| zlib 1.2.8 | 30.51 MB/s | 219.3 MB/s | 6819783 | 3.459 |
| zlib 1.2.8 not reusing a context | 30.22 MB/s | 218.1 MB/s | 6819783 | 3.459 |
| zlib 1.2.8 with zlibWrapper and reusing a context | 30.40 MB/s | 218.9 MB/s | 6819783 | 3.459 |
| zlib 1.2.8 with zlibWrapper not reusing a context | 30.28 MB/s | 218.1 MB/s | 6819783 | 3.459 |
| zstd 1.1.0 using ZSTD_CCtx | 68.35 MB/s | 430.9 MB/s | 6868521 | 3.435 |
| zstd 1.1.0 using ZSTD_CStream | 66.63 MB/s | 422.3 MB/s | 6868521 | 3.435 |
| zstd 1.1.0 with zlibWrapper and reusing a context | 54.01 MB/s | 403.2 MB/s | 6763482 | 3.488 |
| zstd 1.1.0 with zlibWrapper not reusing a context | 51.59 MB/s | 383.7 MB/s | 6763482 | 3.488 |
#### Compatibility issues