[Opensim-dev] proposal: cleanup and break up region modules

[Dr Scofield]

Tleiades Lauridsen wrote:
> 
> 
>> Date: Thu, 29 Jan 2009 08:31:48 +0100
>> From: DrScofield at xyzzyxyzzy.net
>> To: opensim-dev at 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.

we are always loading at runtime --- or let me ask the other way round: what do
you define as "loadtime"?


> 
> 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",

well, we are loading at runtime then.

-- 
dr dirk husemann ---- virtual worlds research ---- ibm zurich research lab
SL: dr scofield ---- drscofield at xyzzyxyzzy.net ---- http://xyzzyxyzzy.net/
RL: hud at zurich.ibm.com - +41 44 724 8573 - http://www.zurich.ibm.com/~hud/