lzma compression on official isos vs Deltaisos
Andre Robatino
andre at bwh.harvard.edu
Wed Mar 10 06:06:32 UTC 2010
Antonio Olivares wrote:
> Andre/others on list,
> The question is why doesn't Fedora use xz compression on the isos
> like TeXLive2009 did it with their isos? If they were to be done
> like that how does the compression match vs the Deltaisos that you
> kindly provide for many Fedora users?
I tried using the default xz compression (level 6 according to the man
page) on Fedora-12-i386-DVD.iso, and reduced it to 96.66% of the
original size, a savings of about 100 MB. Uncompressing took about 2
minutes. (Level 9 compression might do slightly better, but would have
taken much longer to run the test.)
I tried the same thing on a deltaiso, and it actually got slightly
bigger, so that's out. But deltaisos have the advantage that they use
delta compression relative to a similar ISO, so normally they should be
much smaller.
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