Re: Question: Packages.xz and Contents-<arch>.xz

[Peter Samuelson <peter@p12n.org>]

[Hideki Yamane]
> > henrich@hp:/tmp$ du -k Packages.*
> > 6052	Packages.bz2
> > 5812	Packages.xz
> > henrich@hp:/tmp$ time bzip2 -d Packages.bz2 
> > 
> > real	0m0.999s
> > user	0m0.956s
> > sys	0m0.020s
> > 
> > henrich@hp:/tmp$ rm Packages
> > henrich@hp:/tmp$ time xz -d Packages.xz 
> > 
> > real	0m0.565s
> > user	0m0.532s
> > sys	0m0.032s
> 
> > henrich@hp:/tmp$ time gzip -d Packages.gz 
> > gzip: Packages already exists; do you wish to overwrite (y or n)? y
> > 
> > real	0m1.932s
> > user	0m0.272s
> > sys	0m0.012s

While your post has good points, we need to notice that because of the
interactive prompt, the 'real' time value for gzip -d is misleading.

>  decompression speed is 
>   best  : xz
>   second: bz2
>   third : gz

If you ignore the time gzip spent waiting for you to type 'y', it is
the fastest, not the slowest.

Peter