I just rebuilt using the ENABLE_THREADS and have gotten more consistent 
frame rates while loading tiles (thanks for the tip!).  I still get some 
frame rates that are rather low, given my system configuration.  Not 
being a pilot, I am sure that may visibility range is set too high, but 
I tend to stress my systems.

Thanks for the assistance,

Jonathan Polley

On Saturday, February 2, 2002, at 04:39 AM, Christian Mayer wrote:

> Jonathan Polley wrote:
>>
>> If I can put in my $0.02, I would like to see an effort de-couple the 
>> tasks that take place as a part of the IDLE loop. The process of 
>> loading tiles tends to slow down the frame rate quite considerably (by 
>> over 50%). Since I tend to try to stress the system, I do my test 
>> flights out of KSEA and head at 150 degrees (that is the closest 
>> mountain to the airport). I get less degradation where the terrain is 
>> simpler (i.e., in the middle if Iowa, KCID or KDSM). I know there is 
>> some desire to try an allow for an external terrain server, and this 
>> wold prep the way for one. I suppose that, ideally, there should be 
>> three threads. One for the FDM, one for loading tiles (and misc. 
>> operations), and one for building the display.
>>
>> I would also like to see some effort to increase the frame rate. With 
>> my 1.2 GHz Athlon (512 MB RAM and RedHat 7.1), I get about 20-24 FPS 
>> around Seattle when not loading tiles. Ideally, I would like the frame 
>> rate to not drop below 30. This is because I would like to, 
>> eventually, incorporate a helicopter model and low frame rates will 
>> kill you. While loading tiles, under windows, i have the frame rate 
>> drop to below 5 FPS.
>
> Have you tried --with-multithreading (or so)? That should help a lot...
>
> CU,
> Christian
>
> --
> The idea is to die young as late as possible.        -- Ashley Montague
>
> Whoever that is/was; (c) by Douglas Adams would have been better...
>
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