On 11/27/2011 02:59 AM, Aere Greenway wrote:
*UBUNTU 11.04*Polyphony parameter value without under-runs: *26* DSP Load while playing: Usually in 20% range, sometimes in 30% range, max 38.9% *XUBUNTU 11.10* Polyphony paramater value without under-runs: *3* (16, with only 3 tracks playing) DSP Load while playing: In the 50% range, often getting up into the 60% range. *Note: It will not play a single-track piano part without generating under-runs.
Just for the record, this is extremely low. You should be able to get hundreds of voices, even with a 933 MHz machine.
You have configured memlock correctly, right? That is, when you start up fluidsynth, you should *not* get this warning:
fluidsynth: warning: Failed to pin the sample data to RAM; swapping is possible.
On 11.04, all of these machines would perform the test piece on Qsynth without under-runs (though on the 933 megahertz machine, the Qsynth polyphony had to be set down to 26). I will do further testing with my 1.5 gigahertz machine, since this is one of the target machines I originally planned to use.
There was also a change between using single precision and double precision by default. I don't remember exactly between which versions, but I wonder if old machines like this one could be negatively affected (performance wise) by that change.
933 MHz, btw? Is that a Pentium III? Twelve years old or so? Pentium III generation had a significantly worse FPU than later processor generations (Pentium IV, AMD Athlons).
Unfortunately I don't have any old machines around to test with. // David _______________________________________________ fluid-dev mailing list fluid-dev@nongnu.org https://lists.nongnu.org/mailman/listinfo/fluid-dev
