[fluid-dev] High DSP load

[Pedro Lopez-Cabanillas]

Hi,

When using the Jack audio driver, watching the DSP load indicator in QJackCtl, 
running jackdmp 1.9.2 with no other Jack clients, playing a MIDI file with 
aplaymidi ...

1) 
$ fluidsynth -a jack -j -m alsa_seq -r 48000 -g .6 -p fluid  
~/SoundFont/GeneralUser_GS_FluidSynth_v1.43.sf2

2)
$ aplaymidi -p fluid AutumnLeaves.mid
( MIDI file from http://www.dougmckenzie.nl )

Fluidsynth 1.0.9 = around 9% ( 8% < DSP load < 11% )

Fluidsynth 1.1.0 (current SVN) = around 25% ( 23% < DSP load < 28% )

The DSP load is the percentage relative to the period time of the total time 
spent by all clients to finish the processing of one period. 

The work done by FS is more or less the same for the two versions, so I guess 
that the extra DSP load taken by 1.1.0 is spent sleeping in mutex locks.

Regards,
Pedro