[maxmsp] [bug report CNMAT] smooth-biquad~ on intel

[smooth-biquad~] needs more CPU when its signal input is 0! This  
happens on intel, Max4 under OSX4 and OSX5. On a G5, the CPU%  
difference is much much smaller.

Check the files I sent.

On my MacBook Pro, the cpu% usage is between 1 and 6 when the groove  
is playing. When the groove is stopped, the cpu% rises up to 50% (but  
4% on a G5, which is also more than while the groove is playing).  
Stopping/restarting the [dac~], or resetting the [smooth-biquad~] will  
reduce the CPU usage to a more normal value (around 4%).

The regular [biquad~] doesn't share this weird behavior, so I guess  
this is something for the cnmat.

As people here seem to be more concerned by Max5 things than anything  
else, the same problem occurs with Max5, although with different cpu%.

Save as "whatever you want":

#P window setfont "Sans Serif" 9.;
#P window linecount 2;
#P comment 158 62 100 196617 3_ stop the loop & look the cpu %;
#P window linecount 1;
#P newex 347 265 60 196617 loadmess 1;
#P window setfont "Sans Serif" 20.;
#P number 347 342 114 20 0 0 0 3 0 0 0 255 227 23 222 222 222 0 0 0;
#P window setfont "Sans Serif" 9.;
#P newex 347 290 58 196617 metro 100;
#P newex 347 313 66 196617 adstatus cpu;
#P message 463 134 20 196617 80;
#P message 272 134 34 196617 1000;
#P newex 202 103 48 196617 loadbang;
#P message 202 134 50 196617 0 \, loop 1;
#P user ezdac~ 130 389 174 422 0;
#P flonum 272 159 82 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P user gain~ 130 241 24 100 158 0 1.071519 7.94321 10.;
#P toggle 130 44 15 0;
#P newex 130 130 38 196617 sig~ 0;
#P newex 130 158 74 196617 groove~ anton;
#P newex 350 55 113 196617 buffer~ anton anton.aif;
#P newex 130 201 74 196617 poly~ _sbq 16;
#P comment 357 161 100 196617 cutoff ƒ;
#P comment 178 399 100 196617 1_ start dac;
#P window linecount 2;
#P comment 158 34 100 196617 2_ start the loop & look the cpu %;
#P connect 7 0 6 0;
#P connect 6 0 5 0;
#P connect 11 0 5 0;
#P connect 9 0 3 0;
#P connect 5 0 3 0;
#P connect 3 0 8 0;
#P fasten 14 0 8 0 468 230 135 230;
#P connect 8 0 10 0;
#P connect 12 0 11 0;
#P fasten 12 0 13 0 207 127 277 127;
#P connect 13 0 9 0;
#P connect 18 0 16 0;
#P connect 16 0 15 0;
#P connect 15 0 17 0;
#P fasten 12 0 14 0 207 127 468 127;
#P window clipboard copycount 20;


Save as "_sbq"

max v2;
#N vpatcher 331 258 931 658;
#P window setfont "Sans Serif" 9.;
#P window linecount 1;
#N in 1;
#P newobj 184 72 25 196617 in 1;
#N out~ 1;
#P newobj 126 230 39 196617 out~ 1;
#N in~ 1;
#P newobj 111 120 33 196617 in~ 1;
#P newex 176 110 102 196617 filtercoeff~ lowpass;
#P newex 139 180 81 196617 smooth-biquad~;
#P connect 0 0 3 0;
#P connect 2 0 0 0;
#P connect 1 0 0 1;
#P connect 1 1 0 2;
#P connect 4 0 1 0;
#P connect 1 2 0 3;
#P connect 1 3 0 4;
#P connect 1 4 0 5;
#P pop;



_____________________________
Patrick Delges

Centre de Recherches et de Formation Musicales de Wallonie asbl
http://www.crfmw.be/max