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Re: Compression Comparison
From: |
Jim Meyering |
Subject: |
Re: Compression Comparison |
Date: |
Tue, 04 Dec 2007 00:24:33 +0100 |
address@hidden (Bob Proulx) wrote:
> Jim Meyering wrote:
>> To reiterate, here are the sizes:
>> coreutils-6.9.90.tar.gz 8.6 MB
>> coreutils-6.9.90.tar.bz2 5.6 MB
>> coreutils-6.9.90.tar.lzma 3.6 MB
>
> I am a hard sell. It is impressive but not hugely. The original size
> was 35M and so all of these already make large size reductions. Let's
> look at the numbers.
>
> 36280320 coreutils-6.9.90.tar
> 12955108 coreutils-6.9.90.tar.Z
> 8996724 coreutils-6.9.90.tar.gz
> 5952780 coreutils-6.9.90.tar.bz2
> 3682634 coreutils-6.9.90.tar.lzma
>
> That yields[1]:
>
> 100% 36280320 coreutils-6.9.90.tar
> 64% 12955108 coreutils-6.9.90.tar.Z
> 75% 8996724 coreutils-6.9.90.tar.gz
> 83% 5952780 coreutils-6.9.90.tar.bz2
> 89% 3682634 coreutils-6.9.90.tar.lzma
>
> Let's see that more visually. Here is a bar graph.
>
> +----------+--------------------------------------------------+
> | compress |================================ |
> | gzip |===================================== |
> | bzip2 |========================================= |
> | lzma |============================================ |
> | true |==================================================|
> +----------+--------------------------------------------------+
Hi Bob,
I'm surprised you'd compare in such a pessimistic manner.
I look at it differently:
compare download time:
going from gzip to lzma, I see a speed-up of 2.39
going from bzip2 to lzma, I see a speed-up of 1.55
compare disk usage:
going from gzip to lzma, I can store more than twice as much (2.39x) data
going from bzip2 to lzma, I can store 55% more data
Re: coreutils-6.9.90 released, Eric Blake, 2007/12/02