On Saturday, July 09, 2011 11:33:21 PM thorsten.i.r...@jyu.fi wrote:
> Maybe you're also so lucky that no matter what conditions, your framerate
> is high enough - I'm not, so I have to change settings when the scene
> changes enough.
>
> * Thorsten
Speaking of frame rates and eye candy.
I recently changed from OSG2 to OSG3. When I installed it I also rebuilt
simgear and FG using -O3 optimization for all packages including OSG. With
OSG2.X using the same GCC optimization settings I was getting about 22FPS with
minimal eye candy and sometimes it would drop down into the 15FPS range
although at times it was also somewhat higher with a peak rate of about 25FPS.
Usable but not optimal.
After the upgrade to OSG3 the same setup (IE. how much eye candy was being
used, same aricraft, similar weather other settings the same) was running at
about 45FPS. So it basically doubled the frame rate! Of course YMMV. I was
able to add a considerable amount of eye candy and still have my frame rate
remain above 30FPS. I now have the frame rate throttled at 30Hz and it
basically locks onto 30FPS and stays there. This is with multiplayer turned
off. This is a near optimal setup for me although I would like to be able to
get this frame rate with full eye candy and multiplayer enabled.
FYI I am running the following:
AMD Athlon 64 4800+ with 2 gig ram
Nvidia 7950 with 256 meg ram
no over clock on the CPU or GPU
Gentoo Linux 64 bit install
FG and Simegear packages from the gamerlay overlay
OSG3 hand created ebuild in the local overlay
So this is not a high end machine by current standards although it is not a
low end machine either.
I have local weather selected with "tie range to frame rate" set to about 30
although it is hard to tell exactly where this is set in the dialog.
Also in my preferences.xml I have:
<multithreading-mode> AutomaticSelection </multithreading-mode>
With OSG2 this worked and I could see fgfs using CPU cycles on both CPU cores.
This did increase frame rates compared to single threading but only by perhaps
25% on average but it also seemed to improve frames rates even more under
condidtions that would result in lower frames rates. With OSG3 this does
not happen and it appears to only be single threaded. Do I have to do
something different with OSG3 to get multithreading? If multithreading was
working would I see a similar frame rate improvement in OSG3 to what I got
with OSG2?
Hal
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