[Opensim-dev] Severely Decreased LSL Script Performance from 0.6.5 -> 0.6.6 -> 0.6.7

[Dahlia Trimble]

I'm not sure what may be causing your delays but I do have one suggestion
which may help mitigate some issues you are seeing: try making any prins
that you rez phantom and do not change that state until the entire object is
complete. This will eliminate a lot of unnecessafy interaction with the
physics engine and may improve reliability and speed.




On Tue, Oct 6, 2009 at 2:03 PM, Shack Dougall <shack at liferain.com> wrote:

> One part of Prim Composer is an LSL-based rezzing system that creates a
> build from notecard data.
> http://liferain.com/downloads/primcomposer/
>
> In OpenSim 0.6.5, this system worked almost as good as in Second Life.
> Unfortunately, it does not work well in 0.6.6 and is unusable in 0.6.7
>
> *Test Platform*: Standalone, Windows XP, MySQL, ODE Physics,
> Meshmerizer.  Other than this I use the defaults.
>
> So, the question is "What is causing the problem?"  What has changed
> since 0.6.5 that causes the LSL rezzer to perform so badly?
>
> I have verified that the script engine defaults have not changed.
>
> *How the rezzer works*
>
> The rezzer contains linksets with various numbers of prims, e.g.,
> Linkset-10 is a linkset with 10 prims in it.
>
> 1. The rezzer reads data out of a notecard. It sees how many prims
> should be in the next linkset and rezzes a linkset from its inventory
> with that number of prims.
> 2. When the linkset rezzes, the root prim tells the rezzer that it is
> alive and the rezzer sends it the UUID and line number of a notecard to
> read via chat.  At this point, the rezzer goes back to Step 1.
> 3. The root prim then sends a link message to its children telling them
> the UUID and a line number to read.
> 4.  Each prim in the linkset then reads their data independently from
> the notecard and then performs llSetPrimitiveParams to transform
> themselves into the shape determined by the notecard data.
>
> It's actually a lot more complicated than that, but you get the idea.
> So, lots of prims are being rezzed very quickly via LSL and each prim
> has a script in it that reads notecard data and sets params.
>
> In 0.6.5, this process runs very smoothly--prims and scripts are created
> and execute quickly.  In 0.6.6 and above, something is happening that
> drastically slows this process down.  Either the prims are rezzing
> slower, or the scripts are starting slower or the scripts are executing
> slower.
>
> In any event, the difference is extreme.  It is bad in 0.6.6 and seems
> to be even worse in 0.6.7.
>
> Does anyone have any ideas or suggestions?  Is this a bug?  Is it an
> inevitable fact of life?  Can it be improved?  What can I do to help
> with the process?
>
> I'm more than happy to create a video showing the difference.  The LSL
> scripts are open source.  I can also set you up with some test data and
> a copy of my maxport utility if anyone wants to try to reproduce it.  It
> is very easy to do.
>
> Thanks in advance!  --Shack
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>
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