> Date: Thu, 29 Jan 2009 08:31:48 +0100
> From: [email protected]
> To: [email protected]
> Subject: Re: [Opensim-dev] proposal: cleanup and break up region modules
>
> Tleiades wrote:
> >> I'd be much more of a fan of having each module a seperate dll. Files
> >> are cheap too. :) And that makes it very clear to people what they are
> >> loading, and what they aren't loading.
> >>
> >
> > (On the fear of talking about performance prematurely)
> > Won't that cause problems for the JIT'er?
> >
> > Normally access to member variables gets optimized away into a direct
> > memory access rather than invocation of a JSR. If I recall correctly
> > this optimization does not work for dynamically loaded assemblies.
>
> well, if that's the case, then it's not working currently either :-) currently
> we lump all region modules into one large super DLL and load that dynamically.
I guess what I'm saying is that dll files are not as cheap as it is being
implied. Having an application dynamicallly load a large number of dll's at
runtime, is less efficient that loading a few large dll's during load time. The
JIT'ed code will be less efficient and loadtime of the application will
increase. While load time may not be a big issue, I believe it is best to give
the JIT engine the best working condition.
As I understand it the JIT engine and assembly loader have been designed based
on a use pattern which states: "Most assemblies will be loaded during
application load time, and only few assemblies will be loaded at a latter
stage", I definately know this to be a fact for the MS .Net engine, but I don't
know if that is also the case for Mono, although I believe it will be safe to
assume so.
>
> --
> dr dirk husemann ---- virtual worlds research ---- ibm zurich research lab
> SL: dr scofield ---- [email protected] ---- http://xyzzyxyzzy.net/
> RL: [email protected] - +41 44 724 8573 - http://www.zurich.ibm.com/~hud/
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