Re: Facts about the Java class file format

Jan.Vitek@cui.unige.ch
30 Oct 1998 13:07:05 -0500

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| List of all articles for this month |
From: Jan.Vitek@cui.unige.ch
Newsgroups: comp.compilers
Date: 30 Oct 1998 13:07:05 -0500
Organization: Compilers Central
References: 98-10-108 98-10-129
Keywords: Java

>>compressed by about 50%. How much better than that is anyone likely
>>to do and still have a format that's useful for execution? -John]


At least a bit better on the compression side. Next month, Q. Bradley
will present a paper on Jazz at the CASCON'98 conference. Jazz is a
compressor that squeezes individual bytecode files down to aprox. 35%
of original size and Jar files down to 25%. To be a little more
precise:
                                    % of orig size
                                  gzip jazz
metrowerks jar 38 24.4
sun jdk jar 29.3 25.9
icebrowser jar 27.4 22.8


For individual files, on average:
% of orig. size
                                  gzip jazz
icebrowser class 50.6 33.3
sun jdk class 48.1 38.6




Regards,


~jan


PS: the reference is


JAZZ: An Efficient Compressed Format for Java Archive Files
Q. Bradley, R. N. Horspool and J. Vitek,
Proceedings of CASCON'98, Ontario, Canada, November, 1998.

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