Gentoo Archives: gentoo-user

From: Justin <justin@×××××××××.net>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Speed up with pbzip2 or not!?
Date: Sun, 27 Jan 2008 10:40:15
Message-Id: 479C5F89.2060508@j-schmitz.net
In Reply to: [gentoo-user] Speed up with pbzip2 or not!? by Justin
1 Is there a way to use 7zip for decompression with emerge?
2
3
4
5
6 Justin schrieb:
7 > Hey guys!
8 >
9 > Yesterday I found this article
10 > http://gentoo-wiki.com/HOWTO_Speed_up_decompression_with_pbzip2 and
11 > was very happy, because I'm an owner of an Q6600.
12 >
13 > So I tried to reproduce the benchmark from the wiki article but got
14 > that bad results:
15 >
16 > test # time *bzip2* -d -kf linux-2.6.23.tar.bz2
17 >
18 > real 0m11.672s
19 > user 0m11.306s
20 > sys 0m0.367s
21 >
22 >
23 > test # time *pbzip2* -d -p4 -kf linux-2.6.23.tar.bz2
24 >
25 > real 0m25.554s
26 > user 0m24.862s
27 > sys 0m0.683s
28 >
29 > So the parallel version took more than the double time!
30 >
31 > To test whether this is a problem of my Pc I tested this on an Dual
32 > Core with the same result.
33 >
34 > An test with 7z was much better:
35 >
36 >
37 > test # time *7za* x -y linux-2.6.23.tar.bz2
38 >
39 > real 0m4.642s
40 > user 0m8.379s
41 > sys 0m0.327s
42 >
43 >
44 > All tests where done in a tmpfs off 1GB on 2GB RAM.
45 >
46 >
47 > So my questions is what did I do wrong?
48 >
49 > I also tested it with different CFLAGS, but my CFLAGS are basically
50 > very conservative. (-O2 -march=prescott -pipe -fomit-frame-pointer)
51 --
52 gentoo-user@l.g.o mailing list

Replies

Subject Author
Re: [gentoo-user] Speed up with pbzip2 or not!? Benno Schulenberg <benno.schulenberg@×××××.com>
Re: [gentoo-user] Speed up with pbzip2 or not!? Florian Philipp <lists@××××××××××××××××××.net>