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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