Try adding the flag -r22050 as this halves the CPU through put. See: "fluidsynth on NetBooks and low performance computers" on this page: http://sourceforge.net/apps/trac/fluidsynth/wiki/ExampleCommandLines On Nov 20, 2012 9:57 PM, "David Henningsson" <di...@ubuntu.com> wrote:
> On 11/20/2012 08:58 AM, Jan Newmarch wrote: > >> Hi >> >> I recompiled 1.1.6 with polyphony set to 64. There doesn't seem to be a >> command line option to reset parameters like this, but it shouldn't be >> too hard to add one. Yes I know, use fluid_settings_setXXX in the code... >> > > The option is: > "fluidsynth -o synth.polyphony=64" > see "fluidsynth -o help" for more settings. > > Unfortunately it does not seem like the interpolation method is settable > in the same way, which seems strange to me. You have to do it inside the > shell. > > Turning off reverb and chorus, as suggested by others, is done by "-o > synth.reverb.active=False" and "-o synth.chorus.active=False", which might > also speed up fluid_rvoice_buffers_mix (no need to render into reverb and > chorus buffers). > > Anyway... no better. Still hits CPU above 99% (!) and distorts >> accordingly. >> >> (The pidstat command I used was >> pidtat -C fluidsynth - u -r 5 >> for 5 second periods.) >> >> David gives perf figures of >> >> 30% - fluid_rvoice_dsp_interpolate_**4th_order >> 27% - fluid_rvoice_buffers_mix >> 13% - fluid_iir_filter_apply >> 9% - fluid_revmodel_processmix >> >> I ran perf (from linux-tools Debian pkg) on the RPi for nightsin.kar >> using two soundfonts and got >> >> 32.07% fluid_rvoice_buffers_mix >> 26.89% fluid_rvoice_dsp_interpolate_**4th_order >> 12.99% fluid_iir_filter_apply >> 11.00% fluid_revmodel_processmi >> >> for the FluidR3_Gm and >> >> 29.49% fluid_rvoice_buffers_mix >> 23.71% fluid_rvoice_dsp_interpolate_**4th_order >> 14.89% fluid_revmodel_processmix >> 12.53% fluid_iir_filter_apply >> >> for the GeneralUser soundfont (which sounds a bit better). >> No significant difference. >> > > Thanks, seems like the statistics are about the same; with > fluid_rvoice_buffers_mix being on the top. > > Are you running this with floats or doubles, (-Denable-floats=on when > compiling for single-precision floats) and is there a significance in > performance? > > >> Jan >> -- >> >> On Sun, 2012-11-18 at 08:31 -0700, Aere Greenway wrote: >> >>> Jan & David: >>> >>> In my opinion, limiting the polyphony (I presume that is what you mean >>> by "limiting the voices") does not adversely affect the sound. >>> >>> What is using up the CPU, is voices still being 'sounded' that have >>> long before faded to where they are inaudible. sysstat >>> >> >> >>> If Fluidsynth works similarly to the EMU10K1/2 (Soundblaster & Audigy) >>> chip, it should 'take-out' the oldest voices first, though I don't >>> know if that is actually the case. >>> >> > This is controlled by the synth.overflow.* parameters which I implemented > a while ago to give you others some room for experimenting with which > settings work best. I don't remember if I got any feedback for changing the > default parameters. > > // David > > > ______________________________**_________________ > fluid-dev mailing list > fluid-dev@nongnu.org > https://lists.nongnu.org/**mailman/listinfo/fluid-dev<https://lists.nongnu.org/mailman/listinfo/fluid-dev> >
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