[PD] spread Gem-computation over several dsp-cycles (?) (was: [Gem]: gem-pointer and [list] OR slow [repeat])

Thu Mar 1 12:39:41 CET 2007

Roman Haefeli a écrit :
> hello cyrille
> 
> thank you for the adjustments. i think i understand the difference
> between measuring the gemhead loop and the time between 2 images. but
> the other thing with the optimization still remains unclear to me and it
> seems, that it doesn't work here. when i stop the first and start the
> second gemhead, the gemwin becomes black. no primitives are drawn. there
> is no error in the pd-window (there is only a message '[GEMglNewList]:
> mode=4864' when i load the patch).
> does the optimization need some flags enabled when compiling gem?
ous, sorry, it a bug in my patch. you just need to click on a bang : in the pd optimmized primitive windows  : the top one.
it should work if you click in this bang after starting the 2nd gemhead.

> 
> it seems, there is so much about gem, i don't know yet (like all these
> objects [GEMgl*] and [GLdefine] and the like, or the message 'FSAA 4').
FSAA 4 is only here to enable antialiasing : the result is a much nice image if your hardware suport it.

> to understand them, is it needed to know opengl well? are these objects
> documented somewhere in the Gem-documentation?
all GEMgl* object are direct wrapper for openGL fonctionnality. so a openGL book is the best documentation. the "red book" is well known to be the 
reference.

but to be honest, it never try to understand how exaclty does the display list work in Gem, i just cut and paste.

cyrille

> 
> i am not insulted if you don't have the time to answer all these
> questions...
> 
> cheers
> roman
>  
>  
> 
> On Thu, 2007-03-01 at 11:18 +0100, cyrille henry wrote:
>> i made some change to this abstraction in order to compute only the time use for the gemhead loop and not the time between 2 images.
>> on my computer, it's about 11ms.
>> but with the display list optimisation, it fall to 6ms about.
>>
>> cyrille
>>
>> Roman Haefeli a écrit :
>>> as always: i forgot the attachment........
>>>
>>> On Wed, 2007-02-28 at 23:24 +0100, Roman Haefeli wrote:
>>>> On Wed, 2007-02-28 at 07:14 -0600, chris clepper wrote:
>>>>> On 2/28/07, Roman Haefeli <reduzierer at yahoo.de> wrote:
>>>>>         
>>>>>         
>>>>>         i might be wrong but in my eyes it doesn't make sense to do
>>>>>         all the work
>>>>>         that could be done in 50ms in only 1.45ms. 
>>>>>
>>>>> What?  GEM doesn't use the DSP clock.  It will take as much time as
>>>>> needed to render.  
>>>> oops. ok....
>>>>  
>>>>> For example, the current work I have uses three or four 1080i clips, a
>>>>> live feed and records to disk and there is no way that all runs in
>>>>> 1.45ms.  It takes about 12-15ms!
>>>> anyway, i get dropouts when doing gem-rendering, although 'top' tells me
>>>> that pd uses only 20% cpu-time. i don't care much about the audio (as
>>>> IOhannes mentioned, i could run two instances of pd). the problem is
>>>> that the timing is not nice. i'd like to run the patch with 20 frames
>>>> per second. but in praxis each cycle needs 70ms, which gives me a
>>>> framerate of 14. 
>>>>
>>>> is my gpu too slow? what happens, when the gpu is overloaded? can that
>>>> cause pd to stuck?
>>>>
>>>> i attached a little gem-benchmark-test. although you say, gem doesn't
>>>> use the dsp-clock, it takes much longer to compute the first block after
>>>> a gem-rendering command. why is that? 
>>>> and: here on my system, the [realtime] measures up to 70ms, when i go
>>>> over [repeat 1400] (under 1400 it's 50ms). the funny thing is, that it
>>>> stays around 70ms, even if i set the [repeat] up to 3000 or more. why is
>>>> that? here on my system, cpu-time used by pd is always 20%.
>>>>
>>>> sorry to ask you so much...... but i try to understand things a bit
>>>> better.......
>>>>
>>>> roman
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> 	
>>>> 		
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>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> #N canvas 394 19 736 552 10;
>>>> #X obj 26 123 gemwin;
>>>> #X obj 26 42 sel 0 1;
>>>> #X msg 26 95 0 \, destroy;
>>>> #X obj 26 19 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 1 1
>>>> ;
>>>> #X obj 216 102 gemhead;
>>>> #X obj 216 152 translateXYZ 1 1 0;
>>>> #X obj 23 152 gemhead;
>>>> #X obj 23 210 world_light;
>>>> #X msg 48 66 perspec -1 1 -1 1 2 2000 \, lighting 1 \, create \, 1
>>>> ;
>>>> #X obj 23 177 rotateXYZ 30 -54 0;
>>>> #N canvas 1115 145 249 311 measure_realtime 0;
>>>> #X obj 39 40 t b b;
>>>> #X obj 39 256 outlet;
>>>> #X obj 39 16 gemhead;
>>>> #X obj 39 141 f;
>>>> #X obj 39 186 +;
>>>> #X obj 39 163 * 9;
>>>> #X obj 39 209 * 0.1;
>>>> #X obj 39 118 t b f;
>>>> #X text 97 155 smooth it a bit;
>>>> #X obj 39 62 realtime;
>>>> #X connect 0 0 9 0;
>>>> #X connect 0 1 9 1;
>>>> #X connect 2 0 0 0;
>>>> #X connect 3 0 5 0;
>>>> #X connect 4 0 6 0;
>>>> #X connect 5 0 4 0;
>>>> #X connect 6 0 3 1;
>>>> #X connect 6 0 1 0;
>>>> #X connect 7 0 3 0;
>>>> #X connect 7 1 4 1;
>>>> #X connect 9 0 7 0;
>>>> #X restore 198 339 pd measure_realtime;
>>>> #X floatatom 198 368 5 0 0 0 - - -;
>>>> #X obj 217 236 rotateXYZ 1 0 0;
>>>> #X text 247 370 <- check if it goes higher than 50ms;
>>>> #X obj 217 298 cube 0.02;
>>>> #X obj 217 211 translateXYZ -0.001 0 0;
>>>> #X obj 217 263 translateXYZ 0 0 0.02;
>>>> #X obj 31 249 bang~;
>>>> #X obj 31 276 t b b;
>>>> #X obj 31 300 realtime;
>>>> #X obj 31 326 t b f;
>>>> #X obj 31 350 f;
>>>> #X obj 58 351 + 1;
>>>> #X obj 31 379 pack f f;
>>>> #X obj 99 245 gemhead;
>>>> #X obj 99 270 b;
>>>> #X obj 99 293 0;
>>>> #X floatatom 31 434 0 0 0 0 - - -;
>>>> #X floatatom 85 435 0 0 0 0 - - -;
>>>> #X floatatom 127 435 0 0 0 0 - - -;
>>>> #X floatatom 171 436 0 0 0 0 - - -;
>>>> #X floatatom 214 436 0 0 0 0 - - -;
>>>> #X floatatom 255 437 0 0 0 0 - - -;
>>>> #X text 37 457 1;
>>>> #X text 94 458 2;
>>>> #X text 135 458 3;
>>>> #X text 180 459 4;
>>>> #X text 225 459 5;
>>>> #X obj 31 403 route 0 1 2 3 4 5;
>>>> #X text 262 459 6;
>>>> #X text 28 477 realtime measured lenght of the nth dsp-cycle after
>>>> the [gemhead] starts rendering.;
>>>> #X obj 216 129 rotateXYZ 0 0 90;
>>>> #X obj 216 187 repeat 2000;
>>>> #X text 55 17 <- rendering on/off;
>>>> #X floatatom 380 146 5 0 0 0 - - -;
>>>> #X text 425 143 <- try different 'loads';
>>>> #X connect 1 0 2 0;
>>>> #X connect 1 1 8 0;
>>>> #X connect 2 0 0 0;
>>>> #X connect 3 0 1 0;
>>>> #X connect 4 0 41 0;
>>>> #X connect 5 0 42 0;
>>>> #X connect 6 0 9 0;
>>>> #X connect 8 0 0 0;
>>>> #X connect 9 0 7 0;
>>>> #X connect 10 0 11 0;
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>>>> #X connect 15 0 12 0;
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>>>> #X connect 17 0 18 0;
>>>> #X connect 18 0 19 0;
>>>> #X connect 18 1 19 1;
>>>> #X connect 19 0 20 0;
>>>> #X connect 20 0 21 0;
>>>> #X connect 20 1 23 1;
>>>> #X connect 21 0 22 0;
>>>> #X connect 21 0 23 0;
>>>> #X connect 22 0 21 1;
>>>> #X connect 23 0 38 0;
>>>> #X connect 24 0 25 0;
>>>> #X connect 25 0 26 0;
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>>>> #X connect 38 1 28 0;
>>>> #X connect 38 2 29 0;
>>>> #X connect 38 3 30 0;
>>>> #X connect 38 4 31 0;
>>>> #X connect 38 5 32 0;
>>>> #X connect 41 0 5 0;
>>>> #X connect 42 0 15 0;
>>>> #X connect 44 0 42 1;
>>>>
>>>> ------------------------------------------------------------------------
>>>>
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>> plain text document attachment (gem_little_benchmark2.pd)
>> #N canvas 21 42 892 721 10;
>> #X obj 26 123 gemwin;
>> #X obj 26 42 sel 0 1;
>> #X msg 26 95 0 \, destroy;
>> #X obj 26 19 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 1 1
>> ;
>> #X obj 216 102 gemhead;
>> #X obj 216 152 translateXYZ 1 1 0;
>> #X obj 23 152 gemhead;
>> #X obj 23 210 world_light;
>> #X obj 23 177 rotateXYZ 30 -54 0;
>> #X obj 216 236 rotateXYZ 1 0 0;
>> #X text 537 651 <- check if it goes higher than 50ms;
>> #X obj 216 298 cube 0.02;
>> #X obj 216 211 translateXYZ -0.001 0 0;
>> #X obj 216 263 translateXYZ 0 0 0.02;
>> #X obj 31 249 bang~;
>> #X obj 31 276 t b b;
>> #X obj 31 300 realtime;
>> #X obj 31 326 t b f;
>> #X obj 31 350 f;
>> #X obj 58 351 + 1;
>> #X obj 31 379 pack f f;
>> #X obj 99 245 gemhead;
>> #X obj 99 270 b;
>> #X obj 99 293 0;
>> #X floatatom 31 434 0 0 0 0 - - -;
>> #X floatatom 85 435 0 0 0 0 - - -;
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>> #X floatatom 171 436 0 0 0 0 - - -;
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>> #X text 37 457 1;
>> #X text 94 458 2;
>> #X text 135 458 3;
>> #X text 180 459 4;
>> #X text 225 459 5;
>> #X obj 31 403 route 0 1 2 3 4 5;
>> #X text 262 459 6;
>> #X text 28 477 realtime measured lenght of the nth dsp-cycle after
>> the [gemhead] starts rendering.;
>> #X obj 216 129 rotateXYZ 0 0 90;
>> #X obj 216 187 repeat 2000;
>> #X text 55 17 <- rendering on/off;
>> #X floatatom 380 146 5 0 0 0 - - -;
>> #X text 425 143 <- try different 'loads';
>> #X msg 48 66 perspec -1 1 -1 1 2 2000 \, FSAA 4 \, lighting 1 \, create
>> \, 1;
>> #X obj 486 558 f;
>> #X obj 486 603 +;
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>> #X obj 486 626 * 0.1;
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>> #X obj 486 510 realtime;
>> #X floatatom 486 651 5 0 0 0 - - -;
>> #X obj 537 444 gemhead 99;
>> #X obj 486 467 gemhead 1;
>> #X obj 486 489 b;
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>> #N canvas 192 353 840 624 optimized 0;
>> #X obj 37 279 inlet gemlist;
>> #X obj 37 384 outlet gemlist;
>> #X obj 186 221 GEMglGenLists 1;
>> #X obj 156 398 GEMglNewList;
>> #X obj 37 322 GEMglCallList;
>> #N canvas 0 0 450 300 once 0;
>> #X obj 91 62 inlet;
>> #X obj 91 266 outlet;
>> #X obj 91 150 spigot 1;
>> #X obj 91 175 t a b;
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>> #X connect 3 1 4 0;
>> #X connect 4 0 2 1;
>> #X connect 5 0 6 0;
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>> #X connect 7 0 2 1;
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>> #X obj 91 175 t a b;
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>> #X connect 4 0 2 1;
>> #X connect 5 0 6 0;
>> #X connect 6 0 7 0;
>> #X connect 7 0 2 1;
>> #X restore 156 372 pd once;
>> #X obj 235 354 loadbang;
>> #X obj 235 373 GLdefine GL_COMPILE;
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>> #X obj 156 113 gemhead 1;
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>> #X obj 286 241 t f b;
>> #X obj 165 268 t f f;
>> #X msg 305 343 bang;
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>> #X obj 34 130 cube 0.02;
>> #X obj 34 43 translateXYZ -0.001 0 0;
>> #X obj 34 95 translateXYZ 0 0 0.02;
>> #X connect 0 0 3 0;
>> #X connect 1 0 4 0;
>> #X connect 3 0 1 0;
>> #X connect 4 0 2 0;
>> #X restore 186 467 pd primitive;
>> #X connect 0 0 4 0;
>> #X connect 2 1 15 0;
>> #X connect 3 0 11 0;
>> #X connect 4 0 1 0;
>> #X connect 5 0 2 0;
>> #X connect 6 0 3 0;
>> #X connect 7 0 8 0;
>> #X connect 8 0 3 2;
>> #X connect 9 0 5 1;
>> #X connect 11 0 10 0;
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>> #X connect 14 0 6 0;
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>> #X connect 15 0 16 0;
>> #X connect 15 1 13 0;
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>> #X connect 16 1 3 1;
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>> #X obj 624 253 repeat 2000;
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>> #X obj 624 147 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
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>> #X connect 17 1 20 1;
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>> _______________________________________________
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>> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
> 
> 
> 
> 
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