Re: [Flightgear-devel] Multi core discussion

[<fie...@zo...>]

Hi Anders,

Thanks. Very interesting. I added

<multithreading-mode>AutomaticSelection</multithreading-mode>

to my preferences.xml file under <rendering>. At LFPO I am getting 50 
FPS (25-30 before). There are two core threads each 50-60% busy. The 
rest is up to the graphics card probably.

m


Op 06-07-10 15:26, Anders Gidenstam schreef:
> On Tue, 6 Jul 2010, fie...@zo... wrote:
>
>> Op 06-07-10 14:12, Csaba Halász schreef:
>>> I find it hard to believe that you have performance problems with a
>>> core i7, assuming you got a halfway decent graphics card to go with
>>> it.
>>>
>>
>> I am not having performance problems. All is well, but I noticed that
>> only one core thread is used while my Linux reports 8 available (4 cores
>> times 2 threads).
>
> Hi,
>
> Have you tried telling OSG to use more threads?
> Edit the following in your preferences.xml file:
>
> <rendering>
> <!-- Threading modes:
>      AutomaticSelection
>      DrawThreadPerContext
>      CullDrawThreadPerContext
>      CullThreadPerCameraDrawThreadPerContext
>    -->
> <!-- multithreading-mode>AutomaticSelection</multithreading-mode -->
>    ...
> </rendering>
>
> Note that enabling concurrency here currently breaks the built in 
> screenshot mechanism.
>
> IMHO we need to proceed carefully with parallelization - to my 
> knowledge there are only a few subsystems that use (or could with in 
> reason be expected to use) enough CPU time to warrant the effort to 
> move them into separate threads.
>
> AFAIK the really big CPU time consumer is rendering. Various AI 
> systems could be as well if they are used for a large number of AI 
> entities (though computation of AI behaviour is probably still much 
> cheaper than handling the 3d models for them).
>
>
> Cheers,
>
> Anders
>
>
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