[Zlib-devel] Google's version of zlib code

[Frédéric Kayser]

It beats everything except KZIP+kzip2gz+DeflOpt+Defluff+Huffmix run in random mode an awful lot of time.
Zopfli has still some room for improvement since DeflOpt can reduce its output, and it does not pick the same block boundaries as KZIP.

Merging Zopfli with PNGWolf would probably give the ultimate PNG optimization tool.

Regards
-- 
Frédéric Kayser

Le 2 mars 2013 à 17:12, Gilles Vollant a écrit :

> How it compare with deflate compressor of 7zip ?
> 
> -----Message d'origine-----
> De : Zlib-devel [mailto:zlib-devel-bounces at madler.net] De la part de Nelson
> H. F. Beebe
> Envoyé : samedi 2 mars 2013 16:55
> À : zlib-devel at madler.net
> Cc : beebe at math.utah.edu
> Objet : [Zlib-devel] Google's version of zlib code
> 
> This story appeared yesterday:
> 
> 	Google publishes Zopfli as open-source compression algorithm to
> speed up Web download
> 	Compression is about 100 times slower than conventional methods but
> compresses about 5% better, Google said
> 	
> http://www.computerworld.com/s/article/9237264/Google_publishes_Zopfli_as_op
> en_source_compression_algorithm_to_speed_up_Web_downloads
> 
> 	https://code.google.com/p/zopfli/
> 
> It looks like they are hammering the CPU by 100x to get 5% to 8% better
> compression, which is unlikely to be a problem for Google with its huge CPU
> count.  The article claims:
> 
>>> Zopfli is compatible with Zip, PNG, gzip and HTTP requests among others,
> ...
> 
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