[Opensim-dev] llSetTimerEvent accuracy

[Mike Higgins]

Well, there is an OpenSim.ini parameter for setting the minimum time 
that a timer can ask for, and the default is 0.5 seconds.
So if you didn't change that, and you are trying to time 0.1s intervals, 
you should always be off by a huge amount, your results look better than 
that!
As a scripter who wants to write code that is portable around the 
metaverse, I have to assume that 99.999 percent of the systems out there 
have the default setting and therefore I should never count on a timer 
going faster than once every 0.5 seconds.
Then there are other fundamental limits like the 11 times a second 
heartbeat of OpenSim. This makes me suspect that if I want accurate 
times, I have to time everything in increments of 0.0909090909 seconds.
AND THEN there is llSleep, which should be able to accurately time 
things shorter than 1/11th of a second, but it does so by locking up one 
of the script threads. That is a whole 'nother can of worms....


On 3/19/2016 4:43 PM, Jeff Kelley wrote:
> I always thought that llSetTimerEvent was grossly inaccurate when 
> working with fast timer (~ 0.1s) and this opinion is shared among 
> scripters.
>
> That's only true on MONO.
>
> I recently had a try on Windows. The difference is shocking.
>
>
> Typical Linux figures :
>
> [13:49] Primitive: 99.913000
> [13:49] Primitive: 100.266000
> [13:49] Primitive: 100.483000
> [13:49] Primitive: 99.974000
> [13:49] Primitive: 100.312000
> [13:49] Primitive: 100.013000
> [13:49] Primitive: 134.192000
> [13:49] Primitive: 100.383000
> [13:49] Primitive: 100.304000
>
> Admit it, that's just crap.
>
>
> Windows :
>
> [13:44] Primitive: 100.000200
> [13:44] Primitive: 100.000100
> [13:44] Primitive: 100.000100
> [13:44] Primitive: 100.000200
> [13:44] Primitive: 100.000100
> [13:44] Primitive: 100.000200
> [13:44] Primitive: 100.000100
> [13:44] Primitive: 100.000100
> [13:44] Primitive: 100.000200
>
> That's a near-perfect clock.
>
>
> Times in milliseconds.
> MinTimerInterval = 0.05
>
> Is there anything we can do to make MONO less crappy?
>
>
> -- Jeff
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