#18952: heavy performance regression with real/imag(ex)
---------------------------+----------------------------
Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: performance | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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This is the first Symbench test. Sage around 4.3 took 0.3s (see
http://wiki.sagemath.org/symbench#Problem_R1) but Sage-6.8rc0 needs 10
minutes:
{{{
sage: def f(z): return sqrt(1/3)*z^2 + i/3
sage: real(f(f(f(f(f(f(f(f(f(f(i/2)))))))))))
}}}
while
{{{
sage: %timeit real(f(f(f(f(f(f(f(f(f(f(i/2)))))))))).expand())
10 loops, best of 3: 23.5 ms per loop
}}}
A simplified version of this is:
{{{
sage:
real((((((((((sqrt(3)+I)^2+1)^2+1)^2+1)^2+1)^2+1)^2+1)^2+1)^2+1)^2+1)^2
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18952>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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