Date: Thu, 29 Jan 2009 08:31:48 +0100
From: drscofi...@xyzzyxyzzy.net
To: opensim-dev@lists.berlios.de
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 drscofi...@xyzzyxyzzy.net http://xyzzyxyzzy.net/
RL: h...@zurich.ibm.com - +41 44 724 8573 - http://www.zurich.ibm.com/~hud/
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