[PD] Pentium 4 and denormalization

Thomas Musil musil at iem.kug.ac.at
Tue Sep 3 01:40:55 CEST 2002


Hi list,

Please try this benchmark-patch with 6 "hip~" Filters on a P4 (attached: test-hip~.pd).
I ran this patch under w2k with a Pentium 4 / 2Ghz.

results: with white noise input, 6 hip~ take 0.1 %
with zero-signal they eat about 31 % (denormalization of P4).

Question: could somebody try this patch under win_XP and/or under Linux
and report his experience ?

my workaround was: adding a -200 dB noise to each filter.

i found some hints under:

http://music.calarts.edu/~majordom/music-dsp/2001-may/msg00470.html

Thomas Musil
-------------- next part --------------
#N canvas 221 50 680 593 12;
#X obj 357 147 noise~;
#X obj 384 176 *~ 1;
#X obj 384 201 hip~ 5;
#X obj 384 228 hip~ 5;
#X obj 384 254 hip~ 5;
#X obj 384 281 hip~ 5;
#X obj 384 306 hip~ 5;
#X obj 384 333 hip~ 5;
#X msg 439 109 0;
#X msg 476 109 1;
#X floatatom 112 559 4 0 0;
#X obj 19 326 cputime;
#X msg 19 238 1;
#X floatatom 19 261 1 0 0;
#X obj 19 303 t b b;
#X obj 19 350 int;
#X obj 19 213 loadbang;
#X msg 15 92 \; pd dsp \$1;
#X msg 15 42 1;
#X floatatom 15 68 1 0 0;
#X obj 15 17 loadbang;
#X text 43 259 cpu_load_on/off;
#X text 39 66 dsp_on/off;
#X obj 84 436 f;
#X obj 44 500 +;
#X obj 19 399 t f b;
#X obj 19 435 * 0.1;
#X obj 84 460 * 0.9;
#X text 156 558 % cpu_mean;
#X floatatom 112 538 4 0 0;
#X text 153 538 % cpu_peak;
#X text 293 44 with 6 recursive-filters;
#X text 326 62 (lop~ or hip~);
#X obj 19 281 metro 1000;
#X obj 19 374 * 0.1;
#X obj 102 409 unpack;
#X text 176 335 fast;
#X text 178 359 medium;
#X text 193 386 slow;
#X msg 102 385 0.05 0.95;
#X msg 102 360 0.3 0.7;
#X msg 102 336 0.8 0.2;
#X floatatom 439 147 5 0 0;
#X text 291 28 benchmark for Pentium 4 / 2 GHz;
#X text 430 436 dsp_ON \, noise_mul=1: 5.4 %;
#X text 430 449 dsp_ON \, noise_mul=0: 36.2 %;
#X text 430 424 dsp_OFF \, noise_mul=1: 5.3 %;
#X text 420 407 benchmark-results under w2k:;
#X text 101 315 cpu_mean_lowpass-time:;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 4 0 5 0;
#X connect 5 0 6 0;
#X connect 6 0 7 0;
#X connect 8 0 42 0;
#X connect 9 0 42 0;
#X connect 11 0 15 0;
#X connect 12 0 13 0;
#X connect 13 0 33 0;
#X connect 14 0 11 0;
#X connect 14 1 11 1;
#X connect 15 0 34 0;
#X connect 16 0 12 0;
#X connect 18 0 19 0;
#X connect 19 0 17 0;
#X connect 20 0 18 0;
#X connect 23 0 27 0;
#X connect 24 0 10 0;
#X connect 24 0 23 1;
#X connect 25 0 26 0;
#X connect 25 1 23 0;
#X connect 26 0 24 0;
#X connect 27 0 24 1;
#X connect 33 0 14 0;
#X connect 34 0 25 0;
#X connect 34 0 29 0;
#X connect 35 0 26 1;
#X connect 35 1 27 1;
#X connect 39 0 35 0;
#X connect 40 0 35 0;
#X connect 41 0 35 0;
#X connect 42 0 1 1;
-------------- next part --------------
#N canvas 121 83 785 593 12;
#X obj 357 147 noise~;
#X obj 384 176 *~ 1;
#X obj 384 201 hip~ 5;
#X obj 384 228 hip~ 5;
#X obj 384 254 hip~ 5;
#X obj 384 281 hip~ 5;
#X obj 384 306 hip~ 5;
#X obj 384 333 hip~ 5;
#X msg 439 109 0;
#X msg 476 109 1;
#X floatatom 112 559 4 0 0;
#X obj 19 326 cputime;
#X msg 19 238 1;
#X floatatom 19 261 1 0 0;
#X obj 19 303 t b b;
#X obj 19 350 int;
#X obj 19 213 loadbang;
#X msg 15 92 \; pd dsp \$1;
#X msg 15 42 1;
#X floatatom 15 68 1 0 0;
#X obj 15 17 loadbang;
#X text 43 259 cpu_load_on/off;
#X text 39 66 dsp_on/off;
#X obj 84 436 f;
#X obj 44 500 +;
#X obj 19 399 t f b;
#X obj 19 435 * 0.1;
#X obj 84 460 * 0.9;
#X text 156 558 % cpu_mean;
#X floatatom 112 538 4 0 0;
#X text 153 538 % cpu_peak;
#X text 293 44 with 6 recursive-filters;
#X text 326 62 (lop~ or hip~);
#X obj 19 281 metro 1000;
#X obj 19 374 * 0.1;
#X obj 102 409 unpack;
#X text 176 335 fast;
#X text 178 359 medium;
#X text 193 386 slow;
#X msg 102 385 0.05 0.95;
#X msg 102 360 0.3 0.7;
#X msg 102 336 0.8 0.2;
#X floatatom 439 147 5 0 0;
#X text 291 28 benchmark for Pentium 4 / 2 GHz;
#X text 430 436 dsp_ON \, noise_mul=1: 5.4 %;
#X text 430 449 dsp_ON \, noise_mul=0: 36.2 %;
#X text 430 424 dsp_OFF \, noise_mul=1: 5.3 %;
#X text 420 407 benchmark-results under w2k:;
#X text 101 315 cpu_mean_lowpass-time:;
#X obj 559 96 noise~;
#X obj 559 121 *~ 1e-10;
#X obj 559 145 s~ penicillin;
#X obj 447 176 r~ penicillin;
#X text 463 212 add penicillin (-200 dB noise);
#X text 463 228 to any IIR-Filter \, which can input;
#X text 472 243 a zero-signal;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 4 0 5 0;
#X connect 5 0 6 0;
#X connect 6 0 7 0;
#X connect 8 0 42 0;
#X connect 9 0 42 0;
#X connect 11 0 15 0;
#X connect 12 0 13 0;
#X connect 13 0 33 0;
#X connect 14 0 11 0;
#X connect 14 1 11 1;
#X connect 15 0 34 0;
#X connect 16 0 12 0;
#X connect 18 0 19 0;
#X connect 19 0 17 0;
#X connect 20 0 18 0;
#X connect 23 0 27 0;
#X connect 24 0 10 0;
#X connect 24 0 23 1;
#X connect 25 0 26 0;
#X connect 25 1 23 0;
#X connect 26 0 24 0;
#X connect 27 0 24 1;
#X connect 33 0 14 0;
#X connect 34 0 25 0;
#X connect 34 0 29 0;
#X connect 35 0 26 1;
#X connect 35 1 27 1;
#X connect 39 0 35 0;
#X connect 40 0 35 0;
#X connect 41 0 35 0;
#X connect 42 0 1 1;
#X connect 49 0 50 0;
#X connect 50 0 51 0;
#X connect 52 0 2 0;


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