[Freeciv-Dev] Re: (PR#11068) savegame file compression

[Peter Schaefer <peter.schaefer@xxxxxxxxx>]

A player with a slower computer might also have less disk space.

It seemed to me looking at the test of Marko that 
bzip -1 was almost as fast as gzip -6, while resulting in a file 2/3 the size.

How about using bzip -1, then people have to change only one setting
to -9 to get highest compression available.

On 6/25/05, Christian Knoke <chrisk@xxxxxxxxx> wrote:
> On Sat, Jun 25, 2005 at 09:51:09AM -0700, Jason Short wrote:
> >
> > I ran a single test on an autogame with changed compresstype but default
> > compresslevel and saveturns 1.
> >
> > Compresstype 0: 0m26.347s
> > Compresstype 1: 0m28.336s (+1.989) (+7.5%)
> > Compresstype 2: 0m30.919s (+4.572) (+17%)
> >
> > Conclusion: bzip -6 is about 2.25 slower than gzip -6.  This is
> > consistent with Chris's findings earlier in the ticket.  However this
> > isn't really a good measure I think, since with increasing computer
> > speeds and slower freeciv AIs the overhead of compression will drop.
> > Maybe it would be better to look at these as a % fraction of the total
> > runtime.  Note that this is with saveturns 1 so the % is 10x higher than
> > the default would be.
> >
> > A 1.7% overhead is not too much I think.
> >
> > And the file sizes:
> >
> > -rw-r--r--  1 jdorje jdorje 289729 2005-06-25 12:44 civgame-2000.sav
> > -rw-r--r--  1 jdorje jdorje  18116 2005-06-25 12:46 civgame-2000.sav.bz2
> > -rw-r--r--  1 jdorje jdorje  29121 2005-06-25 12:45 civgame-2000.sav.gz
> 
> For a player on a slower machine who plays with saveturns=1 time *and* space
> matters. 17% for compression is a lot.
> 
> 1. find a way (a daemon?) to do the compression in a seperate, crash
> protected, process with a high nice factor.
> 
> 2. do clever savegame management: deleting most savegames of older games.
> 
> Christian
> 
> --
> Christian Knoke            * * *            http://cknoke.de
> * * * * * * * * *  Ceterum censeo Microsoft esse dividendum.
> 
> 
>