Hi,
Curtis Olson wrote:
> On 11/7/06, *leee* <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> I suspect that the graphics will prove to be the trickiest problem
> - it's by
> far the greatest resource user -
>
>
>
> Right, in all this we need to remember that in all our past
> benchmarking, the graphics themselves account for 90-95% of the
> workload. OSG provides some opportunities to thread the graphics
> rendering itself, but beyond that, the remaining 5-10% of
> computational effort is pretty small in comparison. Further dividing
> that up into additional threads may not be such a huge win, unless as
> Durk says there are tasks that are "bursty" like metar fetching which
> has to block on network IO ... that makes a lot of sense to put into a
> separate thread, but does anyone realize the pain we wen through to
> debug that simple task? And then does anyone recall that a subsequent
> patch broke it all again and we had to wind all the way through the
> process and figure it all out again. Lot's of pain was endured by at
> least a couple developers to make that work.
That's OK, I foresee (and am currently feeling) more pain, since FG
won't run on my system (dual Athlon system running Core 5). Hasn't ever
worked even in Plib days. Working on the FG threading is something that
interests me since I am looking at such things at work right now.
> So yes, threading does indeed make sense in certain specific contexts,
> but we need to be really careful about what we do, exactly why we do,
> and what specific peformance benefits we *know* we will get by
> threading some new task.
>
> Curt.
> --
> Curtis Olson - University of Minnesota - FlightGear Project
> http://baron.flightgear.org/~curt/
> <http://baron.flightgear.org/%7Ecurt/>
> http://www.humanfirst.umn.edu/ http://www.flightgear.org
> Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d
>
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Cheers
Lou
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