Thanks to Christian and Aere. Here are some more results on a file nightsin.kar of various choices using pidstat:
Version
flags
sound font
cpu %
memory %
comments
1.1.5
none
FluidR3_GM
75%
43%
unlistenable
1.1.5
-z 4096
FluidR3_GM
70%
43%
unlistenable
1.1.5
-z 4096
GeneralUser
76%
20%
unlistenable
1.1.6
none
FluidR3_GM
80%
40%
still
distorting
1.1.6
-z 4096
FluidR3_GM
75%
40%
distorts
when usage >
90%
1.1.6
-z 4096
GeneralUser
65%
none shown
distorts
when usage >
90%
I haven't tried Aere's suggestions yet. Overall, 1.1.6 sounded better
than 1.1.5, but that may be the result of the options compiled in.
Using pidstat with a resolution of 1 second I got the following
histogram (using octave) of the CPU usage for the last case, 1.1.6 with
GeneralUser soundfont. I know CPU usage of 300% is probably a bit
exaggerated but the file didn't sound too good at that point! Are there
standard MIDI test files for isolating what factors cause what effects?
Cheers
Jan
--
On Sat, 2012-11-17 at 08:09 -0600, S. Christian Collins wrote:
> Try GeneralUser GS FluidSynth version from this site. It is much
> smaller than FluidR3, so it should hopefully use less CPU.
> -~Chris
>
>
> On 11/17/2012 04:25 AM, Jan Newmarch wrote:
>
> >
> > Recently there was a thread about 1.1.5 on an RPi. I'm picking that up
> > for 1.1.6. I have a Model B RPi with 512M RAM. I have the Raspbian hard
> > float image installed rather than the Debian soft float (which behaves
> > worse). I have applied the security fixes suggested by Aere Greenway.
> > I'm running it with period set by -z 4096 as suggested by David
> > Henningsson. I'm observing CPU usage by running top in a separate
> > window:
> >
> > fluidsynth -a alsa -l -z 4096 /usr/share/sounds/sf2/FluidR3_GM.sf2 \
> > youvemad.kar
> >
> > Some simple MIDI files play okay. Others hit CPU usage between 40-99%,
> > varying throughout the song. At 99% CPU the sound is very broken up, too
> > bad to be really playable.
> >
> > It has been suggested that smaller sound fonts will help. What smaller
> > sound fonts are there?
> >
> > I can do more experiments if desired.
> >
> > Jan
>
>
>
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> fluid-dev@nongnu.org
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--
Dr Jan Newmarch
Head of ICT and Commerce (Higher Education)
P 61 3 9286 9971
M +61 4 0117 0509
F 61 3 9286 9100
W www.boxhill.edu.au
W jan.newmarch.name
E j.newma...@boxhill.edu.au
E j...@newmarch.name
<<attachment: FluidSynthCPU.png>>
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