Hi, I was able to solve this problem, it seems that certain instruments in the soundfont had very long release times specified in their presets, by shortening them less cpu was used, I don't understand why the Linux version was able to handle it just fine though, Thanks Ed
On Thursday 26 May 2011 at 20:48, Ed Costello wrote: > Hi Pedro, > > Its an Intel Macbook pro running OS X 10.6.7, I was using just the default > settings of qsynth and have tried increasing the buffersize which had no > effect, I am not using the chorus or reverb effects either, I tried using > your build of qsynth and there was no difference in performance. I am playing > back quite a large soundfont file its 500 mb or so big but it has 25 > instruments in it and only 5 of them are playing at one time, I didn't think > this was an issue though as it plays back just fine on Ubuntu. Also when I > run the 1.1.3 command line version and the sound begins to dropout there are > no error messages that come up even when the sound is gone completely. > > Ed > > On 26 May 2011 19:41, Pedro Lopez-Cabanillas > <pedro.lopez.cabanil...@gmail.com (mailto:pedro.lopez.cabanil...@gmail.com)> > wrote: > > On Thursday 26 May 2011, Ed Costello wrote: > > > Hi list, > > > > > > I am using the Mac version of qsynth and I am getting very high CPU usage > > > when I send midi data to the synth, 50-60 % and even as high as 90%, this > > > is > > > causing very bad audio dropouts, I thought at first it had something to do > > > with the soundfont I was using but I tried the same setup on Ubuntu and > > > everything played fine, the CPU was around 12% most of the time. I tested > > > this with Logic sending Midi to the latest qsynth built from fink on the > > > Mac > > > and on Ubuntu the qtractor and qsynth from the natty repo. I also tested > > > using just the command line version of fluidsynth 1.1.3 on the Mac and I > > > got > > > the same CPU problems. > > > Thanks > > > Ed > > > > > > > Intel or PPC? > > > > There is also a qsynth mac universal binary package at sourceforge, can > > you please try it as well? > > http://sourceforge.net/projects/qsynth/files/qsynth%20%28stable%29/0.3.6/qsynth-0.3.6-univ.dmg/download > > > > My Mac Mini (intel core2duo) and the usual configuration consumes around > > 15% CPU (between 10% and 20%) as reported by the activity monitor. > > > > In order to reduce the CPU usage, you may want to set a bigger buffer size > > (-z, --audio-bufsize=[size]) and/or number of periods (-c, > > --audio-bufcount=[count]). The default values (64x16) are good for low > > latency, but you may save some CPU cycles using greater values. The reverb > > and chorus effects are also very CPU hungry. Please, can you provide > > details about your fluidsynth settings and system? > > > > Regards, > > Pedro >
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