FW: Re: Fwd: FW: Re: Re: Re : Re: Re : Re: [Flightgear-devel] getting the best perfo with FG

2005-06-17 Thread Erik Hofman

Harald JOHNSEN wrote:

BONNEVILLE David wrote:


I forced 60 Hz because I will use a projection system ;)

Well for the moment, I don't think I need to lower my fps, but maybe, 
what would
be nice is if I could force FG to run at a given fps which prevents me 
from

little freezes...  ;)


I see... There is something weird somewhere in the code, don't know if 
someone has allready investigated that or
perhaps it is simply by design but those freeze are a real pain. The fps 
can drop by 50 or 90% for a few frames
for no reason. Is it caused by the 360 scan done every 500 frames, or 
some side effect of the autogen or

perhaps some other piece of code (atc, ai, fdm, etc) ?


You can only effectively reduce them by using a dual processor system 
and with threads enabled. Reading the scenery from disk does take time, 
whether you like it or not.


Using SCSI (and disk striping) would help also.

Erik

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Re: FW: Re: Fwd: FW: Re: Re: Re : Re: Re : Re: [Flightgear-devel] getting the best perfo with FG

2005-06-17 Thread Gerard Robin
Le vendredi 17 juin 2005  13:19 +0200, Erik Hofman a crit :
 Harald JOHNSEN wrote:
  BONNEVILLE David wrote:
  
  I forced 60 Hz because I will use a projection system ;)
 
  Well for the moment, I don't think I need to lower my fps, but maybe, 
  what would
  be nice is if I could force FG to run at a given fps which prevents me 
  from
  little freezes...  ;)
 
  I see... There is something weird somewhere in the code, don't know if 
  someone has allready investigated that or
  perhaps it is simply by design but those freeze are a real pain. The fps 
  can drop by 50 or 90% for a few frames
  for no reason. Is it caused by the 360 scan done every 500 frames, or 
  some side effect of the autogen or
  perhaps some other piece of code (atc, ai, fdm, etc) ?
 
 You can only effectively reduce them by using a dual processor system 
 and with threads enabled. Reading the scenery from disk does take time, 
 whether you like it or not.
 
 Using SCSI (and disk striping) would help also.
 
 Erik
 
  SCSI has ever been,  surely, the best way, i do use it with the best
results.
May be an other way: Does anybody tried to preload scenery in virtual
memory disk ?
-- 
Gerard


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