Re: [tlug] Compression Comparison (WAS: Tip of the Day: "ghosting" a machine with nc and dd)

["Daniel A. Ramaley" <daniel.ramaley@example.com>]

On Tuesday 17 July 2007 14:01, Stuart Luppescu wrote:
>Compressor     Compresssed             Time
>               File Size
>----------     ------------           --------
>bzip2           146,586                0.914
>bzip2 -9        146,586                0.868
>
>These results rather surprised me, especially the comparison of bzip2
>and bzip2 -9, so I decided to try it on another machine.

Did you perform the tests in the order you listed them? It is likely 
that the first run is slightly slower because the file has to be read 
from disk, whereas for subsequent tests it would be in cache. When 
testing speed i usually use files of at least a few hundred MB and/or 
take the average of several trials to reduce the effects of caching.

------------------------------------------------------------------------
Dan Ramaley                            Dial Center 118, Drake University
Network Programmer/Analyst             2407 Carpenter Ave
+1 515 271-4540                        Des Moines IA 50311 USA