[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi
From: |
Jan Newmarch |
Subject: |
Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi |
Date: |
Sat, 24 Nov 2012 12:27:44 +1100 |
On Wed, 2012-11-21 at 16:26 +0100, David Henningsson wrote:
>
> That is a very valid point; we might not strive to eliminate the average
> CPU as much as the worst-case CPU, even if both are important.
>
> Maybe you could run "perf top -d 1" and monitor that, to see if anything
> special happens while the CPU maxes out?
No luck :-(. The output looked the same for good and bad bits
>
> I have another idea too; maybe we're trashing the L1 cache? If so,
> running with -z 1024 or -z 512 might give better result (combined with
> using floats instead of doubles). Here, -z 1024 gave better results, but
> not by much. The Raspberry Pi does not seem to have a L2 Cache (for CPU
> usage), so it might diff more for you.
Just setting -z to either 512 or 1024 and floats instead of doubles
didn't work by itself.
>
> If we do an extremely rough calculation: We have a computer of 1 GHz, a
> sample rate of 50 kHz, and 100 voices; that gives us only 200 cycles per
> voice and sample. And we still have to do several floating point
> calculations every sample. So this leads me to believe that maybe there
> is no holy grail solution to this problem, nothing obvious we're missing
> that causes this CPU usage. Maybe it's more of trying one thing here and
> another thing there.
Sorry to pull in the "competition" here... Timidity gives CPU usage of
around 70-90% on nightsin.kar. But it doesn't have the blowouts to above
100%, and plays okay (just). I don't know what the default settings are
for Timidity though. Maybe it is just fine tuning, although Aere is
getting good results on a slower CPU.
On another tangent, running Fluidsynth as a server to the ALSA MIDI
sequencer alsa_seq plays okay with rate set to 22050.
--
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 address@hidden
E address@hidden
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, (continued)
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, David Henningsson, 2012/11/19
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, S. Christian Collins, 2012/11/19
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, Pedro Lopez-Cabanillas, 2012/11/19
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, David Henningsson, 2012/11/19
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, Pedro Lopez-Cabanillas, 2012/11/19
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, David Henningsson, 2012/11/19
Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, Aere Greenway, 2012/11/17
Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, Jan Newmarch, 2012/11/21
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, David Henningsson, 2012/11/21
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, Aere Greenway, 2012/11/25
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, S. Christian Collins, 2012/11/25
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, David Henningsson, 2012/11/25
- Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, Jan Newmarch, 2012/11/28
Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, Aere Greenway, 2012/11/26
Re: [fluid-dev] problems with fluidsynth 1.1.6 on a raspberry pi, David Henningsson, 2012/11/25