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...
-leif
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