[Opensim-users] Slow LSL timers

[Mic Bowman]

i believe dan did some work on optimizing the timers. maybe he can give some
insight...

--mic


On Fri, Dec 3, 2010 at 5:35 PM, Justin Clark-Casey <jjustincc at googlemail.com
> wrote:

> I'm not familiar with the this area of the code but I had a quick look
> since I was curious (the meat is in
> OpenSim/Region/ScriptEngine/Shared/Api/Plugins/Timer.cs).  The code isn't
> using C# timers so I'm not totally surprised at the behaviour that you're
> seeing.
>
> I suspect addressing this would require a considerably different
> implementation.
>
>
> On 03/12/10 17:18, Jorge Lima wrote:
>
>> Ran 100 timer events with a single if(++i>  100) inside. I suppose
>> decrementing and comparing to 0 might be faster, but I also
>> copy-pasted 100 inlined if clauses and the time to run them was
>> negligible.
>>
>> llSetTimerEvent(0.1) ->  59 s ->  490% overhead
>> llSetTimerEvent(0.2) ->  59 s ->  195% overhead
>> llSetTimerEvent(0.5) ->  59 s ->  18% overhead
>> llSetTimerEvent(0.75) ->  81 s ->  8% overhead
>> llSetTimerEvent(1.0) ->  108 s ->  8% overhead
>> llSetTimerEvent(2.0) ->  209 s ->  4.5% overhead
>> llSetTimerEvent(4.0) ->  407 s ->  1.75% overhead
>>
>> I am guessing that the overhead is, therefore, internal to the timer
>> implementation. I haven't tested raw C# timers as comparison but 100ms
>> is an eternity in modern computing, I can ping servers across the
>> Atlantic ocean in less than that!
>>
>> I went through the code but I haven't yet found the part that handles
>> timers. It's not in EventManager.
>> Does anyone know what's going on? The code works fine in SL.
>> Should I be posting this in the dev list? I'd like to see if I can fix it.
>> Any thoughts on how to get fast timers in OpenSim?
>> Faster computer? (I did check and was only getting about 20% CPU usage...)
>> Porting them to a Real-Time operating system? :)
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>>
>
> --
> Justin Clark-Casey (justincc)
> http://justincc.org
> http://twitter.com/justincc
>
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