On 20/08/10 19:22, Gwyneth Llewelyn wrote:
Hi all,
A simple and stupid question. I was trying to look for some information
if OpenSim is multi-threaded and able to automatically run on multiple
cores, or if due to some limitations of Mono (unknown to me), this is
impossible. Google seems quiet on this (or I might just have been unable
to trigger the right combination of keywords that provide me with the
answer I need).
Hi Gwyn. In many places, OpenSim is very multithreaded - each client on the sim gets its own thread, for instance, and
many client operations are executed with threads from the threadpool.
However, there are some single-thread bottlenecks. The scene updating thread is one, which might be why you don't see
activity consistently on all cores. Changing the number of virtual cores or other configuration parameters won't affect
this - it's a software issue.
If so, it would make more sense to launch multiple separate Mono
instances, each running a set of regions, instead of having just one
instance with all the regions in that server?
I should think that it's always going to be more efficient to run everything within one Mono instance in order to avoid
the overhead of multiple runtimes.
What would you recommend as a more reasonable configuration? I usually
have Linux installations with 4 virtual cores, and from visual
observation, only two (sometimes even just one!) is being used all the
time by OpenSim and Robust. Does Mono somehow pre-bind to a single core
and never changes? (In that case, launching multiple OpenSim instances
would all get pre-bound on a single core, thus not really making any
difference?) For a server that is exclusively used for OpenSim, it seems
a waste to let all those cores run idle...
Thanks for any input on this :)
Cheers,
- Gwyn
--
"I'm not building a game. I'm building a new country."
-- Philip "Linden" Rosedale, interview to Wired, 2004-05-08
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