Re: MCO Performace

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Jean-Luc Dery (dery++at++atlantis.discreet.qc.ca)
Mon, 7 Oct 1996 10:50:41 -0400

Your application is running in locked phase synchronization method; this means
that drawing only begins on the vertical retraces that are integer multiple of
the basic frame rate. If a view takes longer than a frame to render, then an
entire frame is skipped rather than a single vertical retrace period. If
rendring at 60 Hz is not possible, then the next interger mutiple of 60 Hz will
be used, thus 30, 20, 15, ...

Maybe you can try to set the method to either

PFPHASE_FREE_RUN or PFPHASE_FLOAT

Check in the man pages for more details.

Hope this helps,

On Oct 7, 9:32am, Eric Heft wrote:
> Subject: MCO Performace
> Hi,
>
> Anyone have an tips on how to optimize multipipe.c for use
> with a 3 monitor , 1 hw graphics pipe, split using a MCO?
> My sim can do 60hz when its just opening one pipe/monitor.
> When I go to 2 pipes , performance drops to 20-30hz. Even
> when I drop the number of object from 400 to 1!
>
> The hardware: Onyx
> 2 100 mhz R4400's
> 64 Meg main memory.
> 1 RE^2 Graphics board
> 1 MCO
>
> The Program:
>
>
>
> #include <stdlib.h>
> #include <math.h>
> #include <Performer/pf.h>
> #include <Performer/pfdu.h>
> #include <Performer/pfutil.h>
>
> ...
>
> /* Configure and open GL window */
> pfFrameRate(REFRESH);
> pfFieldRate(REFRESH);
> pfPhase(PFPHASE_LOCK);
>
> ...
>
>
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from Eric Heft

-- 
_____________________________________________________________________________


Jean-Luc Dery                         Discreet Logic
System Engineer                       5505 boul. St-Laurent, bureau 5200
3-D Graphics Technology               Montreal (Quebec), Canada, H2T 1S6
                                      Tel: (514) 272-0525 #394
Email: dery++at++discreet.com              Fax: (514) 272-0585
_____________________________________________________________________________


=======================================================================
List Archives, FAQ, FTP:  http://www.sgi.com/Technology/Performer/
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