[sldev] Proposition of cache improvment

Brandon Lockaby gbrandon at gmail.com
Tue Apr 21 12:11:09 PDT 2009


That does sound plausible if you can differentiate which content is cached
that way...
You say "static objects"... perhaps, if an object hasn't been changed in 2
days it could be placed in that category, something like that?

On Mon, Apr 20, 2009 at 3:04 PM, Laurent Laborde <kerdezixe at gmail.com>wrote:

> Friendly greetings !
>
> I'm still worried about cache performance, and come with an idea \o/
> I'm still using this lovely I-Ram for my Secondlife cache. (it's a
> pci-e card with ram slot, and act as a sata hdd, *GOOD* performance)
>
> But... from time to time i have this annoying "greyness" in recently
> visited sim that are supposed to be in cache.
> I don't believe that is because of a slow disk (it's an i-ram)
> I think that :
> - the client request the prims "map" of the sim.
> - then the client request each texture uuid for each prims.
> - it check if it's in cache, if not, it request the texture from LL server.
>
> I got the idea of  declaring a "static object" feature (this prims
> never change and you can cache the texure uuid in a "prims cache").
> But it's not so good.
>
> I found that a lot of crowded sim rarely change, and we could save *a
> lot* of server ressource AND increase user experience.
>
> THE(!) Idea  :
> 1) when you log into a sim, the sim send it's "state_uuid".
> 2a) if the client have this "state" in cache, it can load  (almost?)
> everything from it's own cache.
> 2b) if not, it use the normal procedure (but still using the good(?)
> old(!) texture cache of course)
> 3) everytime something change in the sim, a new state uuid is
> generated and sim cache is discarded.
>
> if( isInCache(state_uuid) ) {
>   LoadSimFromCache();
> } else {
>   LoadSimFromServer();
> }
>
> that's the basic idea. it probably need a lot of tunning. Eg :
> - apply that to set of prims instead of whole sim ?
> - don't cache any scripted object ? (because it may contain texture
> change function (e.g : vendor)
> - add some estate option for tuning/controling the cache behaviour on this
> sim ?
> - add a "static" property to unscripted rezed object ?
>
> My sim is very static and see 500~1500 unique visitor/day (up to
> 45000+ traffic in very good day).
> It's a shame to use a lot of ressource on something that could be
> efficiently cached (Sysadmin Inside (tm) )
>
> *hugs*
>
> --
> Kerunix Flan
> Laurent Laborde
> Sysadmin of http://www.over-blog.com/ (1st french blog plateform)
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