Re: GUADEC Hacking

On Mon, 2005-04-11 at 19:13 +0100, Jamie McCracken wrote:
> Matthias Clasen wrote:
> > On Mon, 2005-04-11 at 18:21 +0100, Jamie McCracken wrote:
> > 
> >>The culprit is pretty obviously GConf which is why I'm glad DConf is 
> >>considering having a DB backend to address this. The short term fixes 
> >>which Havoc has already suggested (moving the schema crap sideways and 
> >>possibly mmap'ing some things) should cut some of that down but only a 
> >>properly indexed database will give you both speed and memory efficiency 
> >>(mmap'ing stuff is obviously wasteful memory wise).
> >>
> > 
> > 
> > mmapping normally saves memory, since you can share the map between all
> > apps, and only actually needed pages are in ram. The only thing wasted
> > by a big mmap cache is address space, which is cheap.
> Not really comparable to a DB which is designed for the cases where you 
> need good random access performance but cant afford to bung it all in 
> memory.
> EG if you have a million records in GConf you will end up with a pretty 
> large mutli megagbyte chunk of memory being allocated.

If we have a million records in GConf, we will need brain surgery before
an DB backend for an hypothetical configuration system.

Bastien Nocera <hadess hadess net> 

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