Re: [gentoo-user] Speed up with pbzip2 or not!?

[Justin <justin@j-schmitz.net>]

Is there a way to use 7zip for decompression with emerge?




Justin schrieb:
> Hey guys!
>
> Yesterday I found this article
> http://gentoo-wiki.com/HOWTO_Speed_up_decompression_with_pbzip2 and
> was very happy, because I'm an owner of an Q6600.
>
> So I tried to reproduce the benchmark from the wiki article but got
> that bad results:
>
> test # time *bzip2* -d -kf linux-2.6.23.tar.bz2
>
> real    0m11.672s
> user    0m11.306s
> sys     0m0.367s
>
>
> test # time *pbzip2* -d -p4 -kf linux-2.6.23.tar.bz2
>
> real    0m25.554s
> user    0m24.862s
> sys     0m0.683s
>
> So the parallel version took more than the double time!
>
> To test whether this is a problem of my Pc I tested this on an Dual
> Core with the same result.
>
> An test with 7z was much better:
>
>
>  test # time *7za* x -y linux-2.6.23.tar.bz2
>
> real    0m4.642s
> user    0m8.379s
> sys     0m0.327s
>
>
> All tests where done in a tmpfs off 1GB on 2GB RAM.
>
>
> So my questions is what did I do wrong?
>
> I also tested it with different CFLAGS, but my CFLAGS are basically
> very conservative. (-O2 -march=prescott -pipe -fomit-frame-pointer)
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