How to increase the speed of this program?

Leo Kislov Leo.Kislov at gmail.com
Tue Nov 28 12:09:18 CET 2006


HYRY wrote:
> Peter Otten wrote:
> > HYRY wrote:
> >
> > > I want to join two mono wave file to a stereo wave file by only using
> > > the default python module.
> > > Here is my program, but it is much slower than the C version, so how
> > > can I increase the speed?
> > > I think the problem is at line #1, #2, #3.
> >
> > > oarray = array.array("h", [0]*(len(larray)+len(rarray))) #1
> >
> > ITEMSIZE = 2
> > size = ITEMSIZE*(len(larray) + len(rarray))
> > oarray = array.array("h")
> > oarray.fromstring("\0" * size)
> >
> > may be a bit faster.
> >
> > Peter
>
> Thank you very much, that is just what I want.

Even faster: oarray = larray + rarray

C:\Python25>python -m timeit -s"from array import array; N = 10**6" "a
=array('h'); a.fromstring('\0'*(2*N))"
100 loops, best of 3: 9.57 msec per loop

C:\Python25>python -m timeit -s"from array import array; N = 10**6; b =
array('h', [0])*(N/2); c = b[:]" "a = b + c"
100 loops, best of 3: 5.7 msec per loop

  -- Leo




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