On Oct 30, 2007 5:52 AM, Fuzzyman <[EMAIL PROTECTED]> wrote: > On Oct 29, 11:35 pm, Steven Bethard <[EMAIL PROTECTED]> wrote: > > Fuzzyman wrote: > > > On Oct 22, 6:43 pm, Steven Bethard <[EMAIL PROTECTED]> wrote: > > >> # Inherit from object. There's no reason to create old-style classes. > > > > > We recently had to change an object pipeline from new style classes to > > > old style. A lot of these objects were being created and the *extra > > > overhead* of new style classes was killing us. :-) > > > > I'm curious. Was it memory or speed overhead that was the problem? > > > It was speed overhead - I have to add a disclaimer that this is > IronPython, but my understanding is that the situation is similar with > CPython. Creating new style class instances is slower than for old > style classes. >
The obvious timeit test shows new-style classes being created in half the time of old style ones. I certainly would not generalize to CPython from IronPythons performance characteristics, especially with something that's so dependent on both the .NET runtime and on the details of IronPython integration as object creation. C:\>python -m timeit -s "class C: pass" "c = C()" 1000000 loops, best of 3: 0.315 usec per loop C:\>python -m timeit -s "class C(object): pass" "c = C()" 10000000 loops, best of 3: 0.175 usec per loop -- http://mail.python.org/mailman/listinfo/python-list
