Mailinglist Archive: opensuse (1126 mails)

[Per Jessen <per@xxxxxxxxxxxx>]

Per Jessen wrote:

> I'm looking for a compression tool (lzma, gzip, zip et al) with the
> following characteristics:
>
> 1. high compression ratio
> 2. multiple files per archive
> 3. very fast decompression/extraction of single files
>
> Compression time is largely immaterial.

Thanks for the various suggestions - I ran some fairly unscientic tests
on zip, 7zip and xar:
About 1000 archives, ranging from 50K to 6Mb (only 4.5M for 7zip).  I
recorded filesize and wall-clock time - and zip won.  They were in fact
all fairly good:

average time for single file extraction 

xar   - 0.058 seconds
7zip  - 0.050 seconds
zip   - 0.036 seconds

Judging by the graphs I made, 7zip shows a slight tendency to increasing
time with filesize, where as zip and xar are both quite stable
time-wise.
I should really do some more tests with bigger archives and more files,
but for the time being and for my purposes this will do.


-- 
Per Jessen, Zürich (17.8°C)

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