[Opensim-dev] [libsl-dev] UUID format: dashed here to stay?

[Sean Dague]

On Thu, Jan 17, 2008 at 10:46:43AM +0000, Justin Clark-Casey wrote:
> dirk husemann wrote:
> > John Hurliman wrote:
> >   
> >> It was actually a big performance boost by changing to the dashed 
> >> format. Internally, LLUUID is just a wrapper around the .NET Guid 
> >> object which has a ToString() method that produces a dashed UUID. The 
> >> non-hyphenated version removed the dashes which required an additional 
> >> memory allocation on top of searching through the string, and I 
> >> decided to just drop it completely. If you want to implement the same 
> >> functionality in your client code it is just mystring.Replace('-',''); 
> >> but I would recommend switching over to the hyphenated version that is 
> >> here to stay.
> >>     
> > wow...very good reason. perhaps OpenSim should follow suit,then...
> >
> >     cheers,
> >     dirk
> >
> >   
> Sounds fine to me personally.  It just needs somebody (or some people) 
> to make all the necessary changes in OpenSim and decide how and to what 
> extent to deal with migration from existing stored data. 
> 
> Just as an observation, this might not be an attractive task at the 
> moment (possibly until the next 'crisis') since things do work right now 
> and there are many other bugs/unimplemented features to attend to.

As far as with/without dashes, I think going with the libsl format is
best.  There is some rationale for the binary format that Tleiades put
in for MySQL Assets (which leaked beyond that I think), as indexes on
strings is many orders of magnitude slower than indexes on binary data.
I'm not sure if we're really affected by this yet, but it is worth
noting.

I think the current approach will be to get to dashed format
universally.  I'm hoping that conversions can be accomplished by
migrations, once I actually get around to writing them. :)

    -Sean

-- 
__________________________________________________________________

Sean Dague                                       Mid-Hudson Valley
sean at dague dot net                            Linux Users Group
http://dague.net                                 http://mhvlug.org

There is no silver bullet.  Plus, werewolves make better neighbors
than zombies, and they tend to keep the vampire population down.
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