#16792: cached_function.clear_cache is inefficent
----------------------+----------------------------
Reporter: dkrenn | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: misc | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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{{{
@cached_function
def noop():
return None
R = Zmod(42)
D = dict((x^k, R(k)^k) for k in srange(1000000))
E = copy(D)
timeit("E.clear()", number=1)
noop.cache = copy(D)
timeit("noop.clear_cache()", number=1)
}}}
gives
{{{
1 loops, best of 3: 954 ns per loop
1 loops, best of 3: 9.56 ms per loop
}}}
This is because {{{.clear_cache}}} does
{{{
cdef object cache = self.cache
for key in cache.keys():
del cache[key]
}}}
which is very inefficient for large caches.
--
Ticket URL: <http://trac.sagemath.org/ticket/16792>
Sage <http://www.sagemath.org>
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