Re: [SoX-devel] Optimization "too good", looking for an explanation

[robs <aq...@ya...>]

I've done some more testing and it looks like what we've currently got is in fact pretty good:

This is before the interleave optimization:

single-threaded

real 37.51
user 37.06
sys 0.32

omp multi-threaded
real 27.60
user 52.13
sys 0.51

fully multi-threaded (simulated using two processes)
real 18.41
user 33.01
sys 1.22

but after:

single-threaded
real 31.58
user 30.64
sys 0.40

omp multi-threaded
real 20.37
user 38.23
sys 0.39

fully multi-threaded (simulated using two processes)
real 18.93
user 32.89
sys 1.47

So OMP seems to be doing a good job (on this linux32 dual-core system at least)

Script attached if anyone else wants to try. (run with parameter "gen" the 1st time)

Cheers,
Rob