#16792: cached_function.clear_cache is inefficent
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Reporter: dkrenn | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: misc | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Your point is probably correct, but your code timing doesn't really
corroborates it. Timeit, as used, it still repeating the command thrice.
It's a mutating command, so the second time around, the original length of
the dict doesn't come into play at all.
{{{
sage: %time E.clear()
CPU times: user 11 ms, sys: 6 ms, total: 17 ms
sage: %time noop.clear_cache()
CPU times: user 59 ms, sys: 5 ms, total: 64 ms
Wall time: 64 ms
}}}
probably gives a fairer picture. Your original numbers would have meant
that `E.clear()` would have visited al 1000000 entries (they all have to
be decreffed!) in less than 1 microsecond, meaning your computer would be
performing more than 10^12^ operations per second. Terahertz performance
is usually not so easily attained.
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Ticket URL: <http://trac.sagemath.org/ticket/16792#comment:2>
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