On Mon, May 6, 2013 at 4:27 PM, Michael Bayer <[email protected]> wrote:
> as for the __slots__ thing, that's a separate issue. if your patch doesn't
> break tests we can set that for 0.9 as well, I doubt anyone is subclassing
> InstanceState, though I'd want to see what the speedup is with that.
About 15% on state creation (which can easily be a big chunk of any
bulk ORM operations):
>>> class InstanceState(object):
... __slots__ = ('a','b','c','__dict__','__weakrefs__')
... def __init__(self):
... self.a = "a"
... self.b = "b"
... self.c = "c"
...
>>> class InstanceStateSlow(object):
... def __init__(self):
... self.a = "a"
... self.b = "b"
... self.c = "c"
...
>>> def test(which):
... for i in xrange(10):
... x = which()
...
>>> import timeit
>>> timeit.timeit(lambda : test(InstanceStateSlow))
8.486893892288208
>>> timeit.timeit(lambda : test(InstanceState))
7.358500003814697
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