Re: MCO Performace

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Sharon Clay (src++at++rose.asd.sgi.com)
Mon, 7 Oct 1996 10:50:09 -0700

+>---- On Oct 7, 10:50am, Jean-Luc Dery wrote:
> Subject: Re: MCO Performace
->
->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.

This will help some (removes one of two points of synchronization)
but the real problem here is probably that the graphics pipes are
not genlocked. Every frame we wait for all pipes to finish
before renderng the next frame and so if the pipes are not genlocked
you'll likely overrun by a field every frame unless the pipes
are WAY underutilized.
If you run with your notify level set to 5 (Or setenv PFNFYLEVEL 5)
you'll probably see lots of Performer messages about not being
genlocked. Check out the genlock man page....

src.

->
->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/
-> Submissions: info-performer++at++sgi.com
-> Admin. requests: info-performer-request++at++sgi.com
->
+>---- End of excerpt from Jean-Luc Dery

-- 
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++
Sharon Rose Clay (Fischler) - Silicon Graphics, Advanced Systems Dev.
src++at++sgi.com  (415) 933 - 1002  FAX: (415) 965 - 2658  MS 8U-590
http://www.sgi.com/Technology/Performer/
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++





attached mail follows:
From: "Jean-Luc Dery" 


Date: Mon, 7 Oct 1996 10:50:41 -0400


To: info-performer++at++sgi.com


Subject: Re: MCO Performace


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/
            Submissions:  info-performer++at++sgi.com
        Admin. requests:  info-performer-request++at++sgi.com







=======================================================================
List Archives, FAQ, FTP:  http://www.sgi.com/Technology/Performer/
            Submissions:  info-performer++at++sgi.com
        Admin. requests:  info-performer-request++at++sgi.com















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