On Thu, 20 Mar 2003, John Jasen wrote:
>
> Among the latest 2.4-release kernels (2.4.19 and 2.4.20), it seems that
> bz2 saves ~6MB.
>
> Downloads: 1.5MB DSL
>
> time `ncftpget ftp://ftp.kernel.org/pub/linux/kernel/v2.4/linux-2.4.20.tar.gz`
> real 3m24.004s
> <snipped>
>
> time `ncftpget ftp://ftp.kernel.org/pub/linux/kernel/v2.4/linux-2.4.20.tar.bz2`
> real 2m51.481s
> <snipped>
>
> Uncompression: Dual AMD 1600+, 512MB ram, 30 GB seagate EIDE
> time `gunzip linux-2.4.20.tar.gz`
> real 0m5.428s
> user 0m2.285s
> sys 0m1.096s
>
> time `bunzip2 linux-2.4.20.tar.bz2 `
> real 0m28.892s
> user 0m27.318s
> sys 0m1.363s
>
> Compression: Dual AMD 1600+, 512MB ram, 30 GB seagate EIDE
> time `gzip linux-2.4.20.tar`
> real 0m18.771s
> user 0m17.990s
> sys 0m0.674s
>
> time `gzip -9 linux-2.4.20.tar`
> real 0m42.032s
> user 0m40.725s
> sys 0m0.791s
>
> time `bzip2 linux-2.4.20.tar`
> real 1m50.411s
> user 1m49.197s
> sys 0m0.555s
>
> bz2 is about 18% of the size of the tarfile. gz is 22%. gzip -9 saved a
> whopping 310k compared to gzip.
>
> --
> -- John E. Jasen (jjasen@realityfailure.org)
> -- User Error #2361: Please insert coffee and try again.
>
Simple question. Has anybody provided a modified `tar` that
will properly extract `tar -xzf ...` without having to determine
ahead of time if it's a bz2 or gzip file? If not, you will
obsolete bz(2)illions of scripts that are in use for automatic
functions world-wide.
If tar will filter through past, present, and future compression
programs without human intervention, then you can get rid of
anything you want. But, until this is done, you need to leave
the "past" alone. There are many machines that get and install
stuff from tapes and home-brew CDs. They may not even have
'bz' stuff. Right now you have to modify scripts to use
tar -xjf after parsing the file-type to check its name and,
|______ Dumb, doesn't make any sense.
some working systems don't even have bzip2 and are not connected
to the Internet.
Last year, I was in Kuala Lumpur, Malaysia (a nice modern city).
My company sent me a new CD to install a software update on
a 3-year old system. The compression was in "@$^_@%" bz format.
There was no such thing on that machine. I had to buy some
"Distribution" and waste time finding out how to extract the
bzip2 stuff from the CD/ROM. Not easy to do when the Distribution
CD/ROM was designed to install a complete operating system.
So my advise is to let the past slowly die away. Do not convert
any older distributions into something new. Leave them alone.
Make sure that any new distribution has the tools to handle the
old stuff and the next stuff. Then you can't go wrong.
Cheers,
Dick Johnson
Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips).
Why is the government concerned about the lunatic fringe? Think about it.
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