Some patchbot test failures happened because of this too.

On Sat, Aug 27, 2016, 21:04 leif <not.rea...@online.de> wrote:

> leif wrote:
> > Steven Trogdon wrote:
> >> I have the following failure:
> >>
> >> sage: P = graphs.PetersenGraph() ## line 539 ##
> >> sage: P.tutte_polynomial() ## line 540 ##
> >> x^9 + 6*x^8 + 21*x^7 + 56*x^6 + 12*x^5*y + y^6 + 114*x^5 + 70*x^4*y +
> >> 30*x^3*y^2 + 15*x^2*y^3 + 10*x*y^4 + 9*y^5 + 170*x^4 + 170*x^3*y +
> >> 105*x^2*y^2 + 65*x*y^3 + 35*y^4 + 180*x^3 + 240*x^2*y + 171*x*y^2 +
> >> 75*y^3 + 120*x^2 + 168*x*y + 84*y^2 + 36*x + 36*y
> >> sage: G = graphs.RandomGNP(10,0.6) ## line 549 ##
> >> sage: G.tutte_polynomial()(1,1) == G.spanning_trees_count() ## line 550
> ##
> >>
> >> **********************************************************************
> >> ----------------------------------------------------------------------
> >> sage -t --long src/sage/graphs/tutte_polynomial.py  # Timed out
> >> ----------------------------------------------------------------------
> >>
> >> which indicates progress in testing tutte_polynomial.py. When the file
> >> is tested individually I get
> >>
> >> sage -t --long src/sage/graphs/tutte_polynomial.py
> >>     [105 tests, 1621.87 s]
> >> ----------------------------------------------------------------------
> >> All tests passed!
> >> ----------------------------------------------------------------------
> >> Total time for all tests: 1622.0 seconds
> >>     cpu time: 26.9 seconds
> >>     cumulative wall time: 1621.9 seconds
> >>
> >> The most recent previous test is with 7.2.rc2 where I have
> >>
> >> sage -t --long src/sage/graphs/tutte_polynomial.py
> >>     [105 tests, 3.99 s]
> >>
> >> And with my sage-on-gentoo install (7.4.beta2) I have
> >>
> >> sage -t --long
> >> /usr/lib/python2.7/site-packages/sage/graphs/tutte_polynomial.py
> >>     [105 tests, 3.52 s]
> >> ----------------------------------------------------------------------
> >> All tests passed!
> >> ----------------------------------------------------------------------
> >> Total time for all tests: 3.6 seconds
> >>     cpu time: 3.5 seconds
> >>     cumulative wall time: 3.5 seconds
> >>
> >> So, something strange is going on?
> >
> > Good catch, that's clearly a regression.  (For me it never timed out in
> > ptestlong tho.)
> >
> >
> > Sage 7.3, GCC 5.4:
> > ==================
> > sage -t --long src/sage/graphs/tutte_polynomial.py
> >     [105 tests, 2.41 s]
> > ----------------------------------------------------------------------
> > All tests passed!
> > ----------------------------------------------------------------------
> > Total time for all tests: 2.5 seconds
> >     cpu time: 2.2 seconds
> >     cumulative wall time: 2.4 seconds
> >
> > real  0m5.195s
> > user  0m3.940s
> > sys   0m0.750s
> >
> >
> > Sage 7.3, GCC 6.1:
> > ==================
> > sage -t --long ../src/sage/graphs/tutte_polynomial.py
> >     [105 tests, 3.23 s]
> > ----------------------------------------------------------------------
> > All tests passed!
> > ----------------------------------------------------------------------
> > Total time for all tests: 3.3 seconds
> >     cpu time: 3.0 seconds
> >     cumulative wall time: 3.2 seconds
> >
> > real  0m7.406s
> > user  0m6.150s
> > sys   0m0.800s
> >
> >
> > Sage 7.4.beta2, GCC 6.1:
> > ========================
> > sage -t --long src/sage/graphs/tutte_polynomial.py
> >     [105 tests, 956.75 s]
> > ----------------------------------------------------------------------
> > All tests passed!
> > ----------------------------------------------------------------------
> > Total time for all tests: 956.8 seconds
> >     cpu time: 13.8 seconds
> >     cumulative wall time: 956.7 seconds
> >
> > real  15m59.486s
> > user  12m9.160s
> > sys   3m56.850s
> >
> >
> > There's a Python process doing almost nothing most of the time...
>
> P.S.:  It's not even a '# long' test (105 tests also without '--long').
>
> And the regression happened *after* beta0 (i.e., in beta1 or beta2).
>
>
> -leif
>
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