Dear Michael
On Dec 6, 5:55 pm, mabshoff <[EMAIL PROTECTED]> wrote:
> See, this is exactly such a problem that back then was not properly
> diagnosed and could potentially let someone to conclude that "Sage is
> crap".
Well, I *did* report it more than one year ago, but I had no trac
account at that time.
This time I made a ticket, namely #4731. It provides a short piece of
code such that the following behaviour occurs:
sage: M=Foo(97,[1,13,100,23098])
sage: timeit('N=M*13')
25 loops, best of 3: 9.66 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 13.3 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 14.3 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 12.2 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 17.3 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 16 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 17.8 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 19.3 ms per loop
sage: timeit('N=M*13')
25 loops, best of 3: 20.7 ms per loop
Hence, the time for one and the same computation drops by a factor of
2 if it is repeated 9 times.
The code calls the logarithm (hence, maxima) in a single line. Replace
that line and the time remains constant.
Good luck with bug-hunting...!
Cheers
Simon
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