I wrote a Wiki article about 'Land' which goes from parcel to region to
estate to grid. When I came to grid, I realized that I had no real idea
how to pin it.
The current definition there is
"A collection of sims (e.g. Agni & Aditi) with a shared asset database."
Does that come close to reality? Can someone improve it?
The article is located at
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...the SL architecture doesn't actually conform to a strict definition
of "grid computing" as you'll soon see. However, the SL grid does have
one big thing going for it -- it works (mostly).
eerrr... I see I should clarify.
So the question I meant was: What is meant by the word "Grid" in context
to SL, in some easy understandable way so it fits in the
article. (Please don't answer with a link to
"A collection of servers which collectively work together to provide
the services required to operate a full virtual world."
Dahlia (off-list reply):
How about something along the lines of "A collection of 256x256x(some
big number) regions arranged on a cartesian plane which share common
back end support services such as asset and inventory storage, presence,
as well as the two Wikipedia links and the initial definition I used in
I think Gareth is something intuitivly understandable although maybe not
very specific. In Dahlias version, the numbers are confusing me. Can a
grid contain of just one region? I guess it can...
I got confused when a friend mentioned that OpenSim got StandAlone- and
Grid-mode so what is a sim _without_ a grid... Sorry to bother this list
with my pondering as it won't help with developement and is just some
On Thu, 2009-02-05 at 01:44 +0100, zai wrote:
> Hey there!
> I wrote a Wiki article about 'Land' which goes from parcel to region to
> estate to grid. When I came to grid, I realized that I had no real idea
> how to pin it.
> The current definition there is
> "A collection of sims (e.g. Agni & Aditi) with a shared asset database."
> Does that come close to reality? Can someone improve it?
> The article is located at
Of course, opensim and SL deal with issues in different ways in any
case so exactly what is done by (a) and what by (b) will be different.
And the hypergrid thing splits everything up into multiple (a)s and
(b)s, hosted anywhere you like. But if I was trying to explain what
"the Grid" was to somebody new and not very technical, I would be
waffling along the lines of "it's made up of regions, which are laid
out in a grid pattern, and each region has an individual program that
handles things that happen in that region - and there are also
underlying databases to handle things that aren't tied to a region,
like your inventory. And they all talk to each other."
For sure, OGSA is definitely only one type of grid, but otoh that does
not make SL a "grid computing environment".
Wikipedia's Grid Computing entry has loosened considerably over the last
3-4 years. To my mind/taste, when defining "grid computing", the tighter
and clearer definition stated in the short paper "What is the Grid"
(http://www-fp.mcs.anl.gov/~foster/Articles/WhatIsTheGrid.pdf) remains a
much more helpful and accurate definition. Of the three checkpoints in
that definition only (3) probably counts for SL's current grid
architecture, since the LL grid has resources under central control (1),
and is not open (2). (Though I note that the AWG is definitely moving SL
closer to this definition).
For most, I sure this is all an exercise in hair-splitting, but I find
it hard to state that SL is a grid computing environment (as yet) but
rather I would say that it is an highly distributed system that includes
In that context, the Second Life grid is the integrated system that
provides a networked collection of servers, some of which are
simulators that implement our presentation of land. Those are arranged
in the form of a rectangular mesh (but yes, it would be possible to
have a "grid" with only one simulator in it). In addition, the SL grid
provides a set of other services, including presence, inventory
management, and asset store, that integrate with but are independent
of the simulators.
Just wanted to thank for the replies! They were really