trying to use xz on manuals.
Alex Kozlov
spam at rm-rf.kiev.ua
Tue Dec 7 07:55:40 UTC 2010
On Mon, Dec 06, 2010 at 10:50:44PM -0800, Tim Kientzle wrote:
> On Dec 6, 2010, at 11:17 AM, Chuck Swiger wrote:
>> On Dec 6, 2010, at 9:13 AM, Alex Kozlov wrote:
>>> On Tue, Dec 07, 2010 at 02:03:50AM +0900, Norikatsu Shigemura wrote:
>>>> .xz smaller than .gz, but effective is about 96.2%:-(.
>>> Some time ago I do similar tests. Changing compression for base man's
>>> to bz2 or xz doesn't make much sense.
>> Oh, agreed. The issue with small files is that they will always take up
>> at least one sector [*]; different compression routines don't gain any
>> benefit if they don't change the number of sectors needed to store the file.
>> More than half of the manpages end up as 1K .gz catman files as it is;
>> ~90% are 2K or smaller.
> It might make sense if XZ decompression were significantly
> faster than GZip decompression. (Especially since man pages
> are decompressed much more often than they are compressed.)
It's not.
Bigest man from the base, FreeBSD 9.0-CURRENT Sat Oct 23 amd64,
CPU: Pentium(R) Dual-Core CPU T4400 @ 2.20GHz (2194.55-MHz K8-class CPU),
average of 3 tries:
$ls -l CC.1*
-rw-r--r-- 1 kozlov kozlov 584775 Dec 7 09:14 CC.1
-rw-r--r-- 1 kozlov kozlov 161663 Dec 7 09:14 CC.1.gz
-rw-r--r-- 1 kozlov kozlov 131580 Dec 7 09:13 CC.1.xz
$cat CC.1.?z >/dev/null
$time xzcat CC.1.xz >/dev/null
real 0m0.032s
user 0m0.028s
sys 0m0.000s
$time gzcat CC.1.gz >/dev/null
real 0m0.012s
user 0m0.008s
sys 0m0.000s
--
Adios
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