#8611: speed up cached_function and cached_method
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Reporter: jason | Owner: tbd
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.6.1
Component: misc | Keywords: cached method
Author: Jason Grout, Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by SimonKing):
I forgot to provide a comparison against an explicitly coded cache:
{{{
sage: class Foo:
....: @cached_method
....: def decorator_bar(self, n=15):
....: return sum(range(2**n))
....: def manual_bar(self, n=15):
....: try:
....: D = self._my_cache
....: except AttributeError:
....: D = self._my_cache = {}
....: D[n] = sum(range(2**n))
....: return D[n]
....:
sage: F = Foo()
sage: F.decorator_bar() is F.decorator_bar()
True
sage: F.decorator_bar() == F.manual_bar()
True
sage: F.manual_bar() is F.manual_bar()
True
sage: timeit('F.manual_bar()', number=10000)
10000 loops, best of 3: 1.02 µs per loop
sage: timeit('F.decorator_bar()', number=10000)
10000 loops, best of 3: 1.71 µs per loop
sage: timeit('F.decorator_bar(15)', number=10000)
10000 loops, best of 3: 3.05 µs per loop
}}}
Hence, the new version of cached methods can almost compete with an
explicitly coded cache, but is of course much more comfortable for the
programmer.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8611#comment:9>
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