[Numpy-discussion] Question about Optimization (Inline and Pyrex)
Tue Apr 17 14:21:49 CDT 2007
Now, I didn't know that. That's cool because I have a
new dual core Intel Mac Pro. I see I have some
learning to do with multithreading. Thanks.
--- Anne Archibald <firstname.lastname@example.org> wrote:
> On 17/04/07, Lou Pecora <email@example.com>
> > You should probably look over your code and see if
> > can eliminate loops by using the built in
> > vectorization of NumPy. I've found this can
> > speed things up. E.g. given element by element
> > multiplication of two n-dimensional arrays x and y
> > replace,
> > z=zeros(n)
> > for i in xrange(n):
> > z[i]=x[i]*y[i]
> > with,
> > z=x*y # NumPy will handle this in a vector
> > Maybe you've already done that, but I thought I'd
> > offer it.
> It's also worth mentioning that this sort of
> vectorization may allow
> you to avoid python's global interpreter lock.
> Normally, python's multithreading is effectively
> cooperative, because
> the interpreter's data structures are all stored
> under the same lock,
> so only one thread can be executing python bytecode
> at a time.
> However, many of numpy's vectorized functions
> release the lock while
> running, so on a multiprocessor or multicore machine
> you can have
> several cores at once running vectorized code.
> Anne M. Archibald
> Numpy-discussion mailing list
-- Lou Pecora, my views are my own.
"I knew I was going to take the wrong train, so I left early."
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