On Sun, Dec 18, 2005 at 08:31:26PM +0100, Florian Weimer wrote:
> > Afaict from the webpage 7zip (LZMA) is quite a bit slower bzip2. -
> > Have you perhaps run some benchmarks?
> Memory use during decompression would be interesting, too.
For pure lzma it isn't really bad, it's about 100kb + directory_size and
this is usually 8 MB (that is a sane value), but smaller directory
sizes may be used as well.
Some data discussion, also for the speed issue:
(user time only)
compression of libgcj6 (17612800 uncompressed), the first file i found
that is big enough for usefull data
gzip - 7.5 sec - 5118403
bzip2 - 16.9 sec - 5039522
lzma 8MB (-a2) - 53.8 sec - 3643734
lzma 2MB (-a2) - 50.3 sec - 3648493
lzma 1MB (-a2) - 48.1 sec - 3675183
lzma 1MB (-a1) - 41.1 sec - 3707349
lzma 1MB (-a0) - 23.5 sec - 3985219
lzma 512k(-a0) - 22.6 sec - 3994574
lzma 2MB (-a0) - 26.5 sec - 3979074
decompression:
Memory usage about
gzip - 0.2 sec - no idea, but few
bzip2 - 3.2 sec - 3700 kb
lzma 8MB - 0.8 sec - 8200 kb
lzma 2MB - 0.8 sec - 2150 kb
lzma 1MB - 0.8 sec - 1120 kb
lzma 512k- 0.8 sec - 620 kb
In the end adding lzma to dpkg can't harm, it's just a small patch and
has no external requierements, code size just grows like 12 kb or
something.
Cheers,
Christian
--
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nondum habetur, quomodo habenda est." (Aurelius Augustinus)
Translation: <http://gnuhh.org/work/fsf-europe/augustinus.html>
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