diff --git a/NEWS b/NEWS index c0cf789e..1c7facdc 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,5 @@ v0.3.4 -Faster low cLevels +Faster fast cLevels v0.3.3 Small compression ratio improvement diff --git a/README.md b/README.md index 54fc53bf..b8ff8783 100644 --- a/README.md +++ b/README.md @@ -7,7 +7,7 @@ It is provided as a BSD-license package, hosted on Github. |master | [![Build Status](https://travis-ci.org/Cyan4973/zstd.svg?branch=master)](https://travis-ci.org/Cyan4973/zstd) | |dev | [![Build Status](https://travis-ci.org/Cyan4973/zstd.svg?branch=dev)](https://travis-ci.org/Cyan4973/zstd) | -For a taste of its performance, here are a few benchmark numbers from a number of compression codecs suitable for real-time. The test was completed on a Core i7-5600U @ 2.6 GHz, using [fsbench 0.14.3](http://encode.ru/threads/1371-Filesystem-benchmark?p=34029&viewfull=1#post34029), an open-source benchmark program by m^2. +For a taste of its performance, here are a few benchmark numbers from a number of compression codecs suitable for real-time. The test was completed on a Core i7-5600U @ 2.6 GHz, using m^2's [fsbench 0.14.3](http://encode.ru/threads/1371-Filesystem-benchmark?p=34029&viewfull=1#post34029) compiled with gcc 4.8.4, on the [Silesia compression corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia). |Name | Ratio | C.speed | D.speed | |-----------------|-------|--------:|--------:| @@ -23,7 +23,7 @@ For a taste of its performance, here are a few benchmark numbers from a number o [zlib]:http://www.zlib.net/ [LZ4]:http://www.lz4.org/ -Zstd can also offer stronger compression ratio at the cost of compression speed. Speed / Ratio trade-off is configurable by small increment, to fit different situations. Note however that decompression speed is preserved and remain roughly the same at all settings, a property shared by most LZ compression algorithms, such as [zlib]. The following test is run on a Core i7-3930K CPU @ 4.5GHz, using [lzbench], an open-source in-memory benchmark by inikep, on the [Silesia compression corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia) +Zstd can also offer stronger compression ratio at the cost of compression speed. Speed / Ratio trade-off is configurable by small increment, to fit different situations. Note however that decompression speed is preserved and remain roughly the same at all settings, a property shared by most LZ compression algorithms, such as [zlib]. The following test is run on a Core i7-3930K CPU @ 4.5GHz, using [lzbench], an open-source in-memory benchmark by inikep compiled with gcc 5.2.1, on the [Silesia compression corpus](http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia). [lzbench]:https://github.com/inikep/lzbench @@ -32,9 +32,9 @@ Compression Speed vs Ratio | Decompression Speed ![Compression Speed vs Ratio](images/CSpeed.png "Compression Speed vs Ratio") | ![Decompression Speed](images/DSpeed.png "Decompression Speed") -Zstd entropy stage is provided by [Huff0 and FSE, from Finite State Entrop library](https://github.com/Cyan4973/FiniteStateEntropy). +Zstd entropy stage is provided by [Huff0 and FSE, from Finite State Entropy library](https://github.com/Cyan4973/FiniteStateEntropy). -Its memory requirement can also be configured to fit into low-memory hardware configurations, or servers handling multiple connections/contexts in parallel. +Its memory requirement can be configured to fit into low-memory hardware configurations, or servers handling multiple connections/contexts in parallel. Zstd has not yet reached "stable format" status. It doesn't guarantee yet that its current compressed format will remain stable and supported in future versions. During this period, it can still change to adapt new optimizations still being investigated. "Stable Format" is projected sometimes early 2016. diff --git a/images/CSpeed.png b/images/CSpeed.png old mode 100644 new mode 100755 index 88d302c8..338c27b2 Binary files a/images/CSpeed.png and b/images/CSpeed.png differ diff --git a/images/DSpeed.png b/images/DSpeed.png old mode 100644 new mode 100755 index b252ab65..b503b5f8 Binary files a/images/DSpeed.png and b/images/DSpeed.png differ diff --git a/programs/paramgrill.c b/programs/paramgrill.c index 5c67772a..520acc1e 100644 --- a/programs/paramgrill.c +++ b/programs/paramgrill.c @@ -738,9 +738,10 @@ static void BMK_benchMem(void* srcBuffer, size_t srcSize) const int maxSeeds = g_noSeed ? 1 : ZSTD_HC_MAX_CLEVEL; for (i=1; i<=maxSeeds; i++) { + const U32 btPlus = (params.strategy == ZSTD_HC_btlazy2); params = g_seedParams[i]; params.windowLog = MIN(srcLog, params.windowLog); - params.contentLog = MIN(params.windowLog, params.contentLog); + params.contentLog = MIN(params.windowLog+btPlus, params.contentLog); params.searchLog = MIN(params.contentLog, params.searchLog); BMK_seed(winners, params, srcBuffer, srcSize, ctx); }