[Opensim-users] Information on the number of sensors that an opensim region can support

[Dahlia Trimble]

Sensors are fairly expensive and inefficient as unless you specify a scan
with a given key, they must do a linear search of all of the specified
entity types in the scene (region). In other words, if you ask for avatars
in an area, it must test all avatars in the region, or if you ask for
objects it must test all of the objects. These searches also require
exclusive access to the region entities, so only one can happen at a time
and anything else that needs access must wait (physics, avatar movement,
etc.). Therefore adding many sensors doing frequent scans will eventually
degrade sim performance and could have a cascading effect. I'm not aware of
any numeric limit; it would depend on how many objects and avatars are in
the region and how powerful the machine is the sim is running on and how
busy it is doing other things. I'd think testing this would be difficult as
you may run into a situation where it appears to work fine when you are
building/testing but then performs poorly or even fails when there are many
avatars in the region. Lacking any known limit but with these concepts in
mind, I guess you'll just have to try adding as many as you need and see
when something breaks. Keep in mind that specifying a scan with a key or
using llGetObjectDetails with a known key is likely far more efficient than
doing arbitrary scans.

Unfortunately OpenSimulator currently lacks any means of doing efficient
spatial queries. This is something I've brought up in development meetings
a few times but the idea has never really caught on.

Good luck with your project :)

On Thu, Oct 16, 2014 at 11:21 AM, Dr Ramesh Ramloll <r.ramloll at gmail.com>
wrote:

> Hello there,
> Is there some information about any limit on the number of sensors that an
> opensim region can support by default?
> We are planning to use many sensors at one time, some even attached to
> vehicles and projectiles, are there anything we should be especially
> careful about regarding their use in this manner?
> Thanks
> Ramesh
> --
> 'Consider how the lilies grow. They do not labor or spin.'
> *Rameshsharma Ramloll* PhD, CEO CTO DeepSemaphore LLC, Affiliate *Research
> Associate Professor*, Idaho State University, Pocatello, ID 83209 Tel:
> 208-240-0040
> LinkedIn <http://www.linkedin.com/in/rameshramloll>, DeepSemaphore LLC
> <http://www.deepsemaphore.com>, RezMela <http://www.rezmela.com>, Google+
> profile <https://plus.google.com/103652369558830540272/about>
>
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