[Opensim-dev] Phantom prims and memory usage?

[John Sheridan]

Kyle, I agree...  If this does turn out to have an impact on making 
builds more efficient then perhaps it should go in as a default 
setting?  Although I wonder if that would be a server side function or 
if it would need to be client side.  It certainly will be interesting to 
see.

...  - And before I forget as my brains are about to turn into jelly, 
thank you Dahlia for your explanation.  That really does help to clarify 
just how all of this works.  :)

Thanks, :)
 - John / Orion

Kyle wrote:
> I just made most prims phantom on a new build that had been some trouble and
> it seems smoother now. I will try and get more definitive data but this
> seems promising and possibly should be considered to have prims phantom by
> default. Though this would throw off many new builders.
>
> -----Original Message-----
> From: opensim-dev-bounces at lists.berlios.de
> [mailto:opensim-dev-bounces at lists.berlios.de] On Behalf Of John Hopkin
> Sent: Wednesday, February 25, 2009 11:43 AM
> To: opensim-dev at lists.berlios.de
> Cc: opensim-users at lists.berlios.de
> Subject: Re: [Opensim-dev] Phantom prims and memory usage?
>
> John Sheridan wrote:
>
>   
>> Ok, I'm trying a little bit of an experiment here and I'm wondering if 
>> anyone else has tried this and had similar results?  We're running ODE 
>> on Linux Ubuntu using a vps setup hosted on quad core Xeons.
>>
>> I'm going on the concept that if an object does not need any sort of 
>> physical interaction that if its made phantom the server will in effect 
>> use less resources.  In this case I have one server thats running six 
>> sims with around 30,000 prims spread between them all.  After going 
>> around and setting as many objects as possible to phantom (telephone 
>> poles, windows, tables, chairs, misc props and anything thats not needed 
>> to keep the avatar from falling out of the buildings) it appears as 
>> though that server's memory usage has gone down from about 70% (740 
>> megs) down to 45% (520 megs).  I would estimate that in total 
>> approximately 15,000 to 20,000 prims were set to phantom.
>>     
>
> Very interesting - thanks for looking into this.
>
> It seems that in actual builds, those we see in use in SL, for
> example, most prims don't need to be non-phantom but are, and it's not
> surprising to find that your exercise reduces the cost.   I've
> sometimes wondered if there's a case for saying that new prims should
> be phantom by default, though I'm not necessarily suggesting that as a
> course of action for OpenSim.  It certainly helps avatar movement when
> a cleanup like you describe is done, especially with furniture,
> poseballs etc, and it's well worth the time doing that even if only
> for the sake of smooth operation.
>
> Is there any indication of a corresponding drop in CPU usage,
> especially when avatars are moving around in there?
>   

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