On 29/10/20 12:50 am, Marcus Weseloh wrote:
Hi,
Am Mi., 28. Okt. 2020 um 13:10 Uhr schrieb Ceresa Jean-Jacques
:
Now we should try the suggested test to run 2 fluidsynth console applications
(a1, a2) at the same time (not sequencially) and measure the total time.
That's a really good idea to
Am Mi., 28. Okt. 2020 um 20:11 Uhr schrieb Tom M. via fluid-dev
:
> 1. The samplecache is guarded by a mutex that prevents naïve
> parallelization.
Yes, and that is a difficult lock to remove, I think. But as a quick
check for a possible speedup factor with parallel loading, your branch
is a good
>Currently, there are two problems: 1. The samplecache is guarded by a mutex
>that prevents naïve parallelization. 2. If we relax that mutex we get a
>strange race condition,...
The whole fluid_samplecache_load() need to be atomic and isn't thread safe
without the mutex
-get_samplecache_entry(
An idea to parallelize loading would be to use openMP Tasks. I've made a
quick'n dirty implementation of that:
https://github.com/FluidSynth/fluidsynth/tree/parallelize-sf3-loading
Currently, there are two problems:
1. The samplecache is guarded by a mutex that prevents naïve
parallelization.
2.
Hi,
>So it looks like parallel loading would be beneficial.
Yes, as we notice that with 1 or 2 simultaneous loading the total time is quite
the same (6,1s 6,6s)
However with 3 and 4 simultaneous loading we see that the total time doesn't
stay constant but is growing (8,8s and 10,4s), probaly
Hi again,
just to highlight the much faster speed of SF2 loading, here is the
previous test run again, but this time with the same Soundfont in SF2
format (converted with Polyphone). The resulting SF2 is 204 MB (SF3
was 40MB):
$ time ./test.sh 1
real 0m0,366s
user 0m0,093s
sys 0m0,163s
$ time ./
Hi,
Am Mi., 28. Okt. 2020 um 13:10 Uhr schrieb Ceresa Jean-Jacques
:
> Now we should try the suggested test to run 2 fluidsynth console applications
> (a1, a2) at the same time (not sequencially) and measure the total time.
That's a really good idea to quickly test if parallel loading has
merit.
Hi,
>The SF3 files are taking ~5 seconds each to load. The SF2 files take
>400-500ms, despite being 7-10x the size, so the bottleneck is not disk I/O.
Ok, assuming one SF3 file x taking 5 seconds to load using one fluidsynth
console application a1.
Now we should try the suggested test to ru
