#17435: Cythonise path algebra elements
-------------------------------------+-------------------------------------
Reporter: SimonKing | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.5
Component: algebra | Resolution:
Keywords: path algebra | Merged in:
elements | Reviewers:
Authors: Simon King | Work issues:
Report Upstream: N/A | Commit:
Branch: | a961dfdfc400b165a05ba8f41a7efcf08c104c84
u/SimonKing/cythonise_path_algebra_elements| Stopgaps:
Dependencies: #16453 |
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Comment (by SimonKing):
I just noticed that the letterplace implementation leaks in the following
example:
{{{
sage: L.<x,y,z> = FreeAlgebra(GF(25,'t'), implementation='letterplace')
sage: p = x^4+x*y*x*z+2*z^2*x*y
sage: while 1:
....: print get_memory_usage()
....: z = p^7
}}}
The corresponding example with path algebras does not leak (one only sees
that the kill list fills up in the first few iterations):
{{{
sage: P =
DiGraph({1:{1:['x','y','z']}}).path_semigroup().algebra(GF(25,'t'))
sage: p = sage_eval('x+y*z*x+2*y-z+1', P.gens_dict())
sage: while 1:
....: print get_memory_usage()
....: z = p^7
}}}
That might explain why letterplace is slower than path algebras. In any
case, fixing the leak should be the purpose of another ticket.
--
Ticket URL: <http://trac.sagemath.org/ticket/17435#comment:16>
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