[Opensim-users] Consequences of vicinity

[Diva Canto]

My message about the consequences of vicinity was more towards people 
who have regions in OSGrid, really, although the situation is generic.
As we work on inter-sim comms, things will get wild for people having 
neighbors in OSGrid which they don't control.
It's cool if people want to help find the problems and fix them; it's 
not cool if people want stability. For stability, get away from regions 
which you don't control.

As a heads up, r7891 and above breaks inter-sim communications with 
older versions.

Crista

Frank W Sweet wrote:
> The present HG "link-region" console command is, of necessity, a
> temporary expedient. In a few years, there may well be tens of
> thousands of independent stand-alone sims out there (mostly roleplay,
> formal education, or corporate training). Users will need to TP among
> them as easily as they link between web pages today. The appropriate
> analogy for HG-TP is the html link.
>
> Today's HG "link-region" console command demands sim owner involvment.
> This is as infeasible as asking a website owner to let you link out of
> her website. Instead, HG-TP must be made dynamic. The destination
> region must be notified to prepare only when the use actually clicks
> on TP-out, and the actual TP initiated only after that first step.
>
> Users will never fly (or walk or drive) from one standalone region (or
> one grid) to another. Hence, there is no need to notify every
> conceivable destination sim (no matter how near or far grid-wise) that
> user-A has logged on somewhere. Instead, only the immediate target
> region of an initiated HG-TP should be notified, and that notification
> should then be immediately followed by the incoming user.
>
> That way, only those users actually present at the UCI Welcome region,
> plus those inbound in transit, will spawn child agents in the region
> (rather than spawnng child agents for every user in every linked sim). 
> True, even these agents may still overload the region if it is
> extremely popular. But that is a problem that we already know how 
> handle.
>
> Frank W. Sweet
> Backintyme Publishing
>
> ----- Original Message ----- 
>
> Message: 5
> Date: Mon, 29 Dec 2008 11:16:00 -0800
> From: Diva Canto <diva at metaverseink.com>
> Subject: [Opensim-users] Consequences of vicinity
> To: opensim-users at lists.berlios.de
> Message-ID: <495921F0.9010306 at metaverseink.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi,
>
> As we move opensim into a truly decentralized system, with things like
> the Hypergrid, but also grids like OSGrid, it is important for people
> to
> understand what space vicinity really means, and the consequences of
> neighboring someone. I thought I'd write this in an email, to reach
> the
> wider number of opensim users.
>
> One of the main features of these 3D VWs is the continuity of 3D space
> in a logical grid. That is, you are in a region but you can see the
> things that are in neighboring regions, even when those neighboring
> regions are running on machines half-way across the globe. You can
> cross
> to your remote neighbors as if you were crossing to a region on your
> machine, etc. That's all very nice, but...
>
> This model is taken from massive multi-player on-line games *that are
> controlled by single organizations*. Things need a lot more
> consideration when we go to a decentralized control system. Let me
> explain why.
>
> The illusion of space continuity is achieved by spawning computations
> on
> your neighbors' machines (and your neighbors' on yours). This is done
> via inter-simulator communications, that start and manage what is
> known
> as "child agents". There are a number of consequences of this:
>
> 1) As we work on inter-simulator communications, if your neighbors
> aren't exactly on the same version of OpenSim that you are, things may
> break badly for you.
>
> 2) For HG, if you place an hyperlink next to your region, it will
> create
> child agents on that remote simulator. For example, if everybody would
> place the UCI Welcome region as a direct neighbor, the poor UCI
> Welcome
> region would have hundreds of child agents -- the number of
> hyper-neighbors is not restricted to 8.
>
> For the HG, distance is not enforced (yet), but it may very well be
> enforced soon.
>
> For grids like OSGrid, I strongly advise people who want some form of
> stability while using SVN Head (ah!) to keep distance from their
> neighbors. Inter-sim comms are about to go through a period of change.
>
> Crista
>
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