#10513: Coercion and category framework for modules
-------------------------------------+-------------------------------------
Reporter: SimonKing | Owner: robertwb
Type: defect | Status: needs_work
Priority: major | Milestone: sage-pending
Component: coercion | Resolution:
Keywords: coercion, | Merged in:
category framework, modules | Reviewers: Jean-Pierre Flori
Authors: Simon King, Peter | Work issues:
Bruin | Commit:
Report Upstream: N/A | b1287e75962a2dc590f1fa22acc90a4e53383aab
Branch: | Stopgaps:
u/jdemeyer/ticket/10513 |
Dependencies: #16507, #17578, |
#17561 |
-------------------------------------+-------------------------------------
Changes (by nbruin):
* status: positive_review => needs_work
Comment:
On 6.5.beta5:
{{{
sage: %time for p in prime_range(10^5): V=(GF(p))^3
CPU times: user 3.63 s, sys: 28 ms, total: 3.66 s
Wall time: 3.65 s
}}}
With this branch:
{{{
sage: %time for p in prime_range(10^5): V=(GF(p))^3
CPU times: user 13.4 s, sys: 29 ms, total: 13.5 s
Wall time: 13.5 s
}}}
I think that's a significant regression in performance. It's probably due
to the construction of the category-with-base. If you change the category
to be "Category of vector spaces over Fields" or "over Finite Fields"
you'll get much better performance, because there's not a new category to
be constructed for every single space.
(this stuff isn't academic--such spaces really get made a lot in CRT
code). See also #17360, where the issue causes a memleak (that seems to be
fine here). See also [http://trac.sagemath.org/ticket/10963#comment:506]
where this issue was mentioned right at the start of the development of
these parametrized categories.
--
Ticket URL: <http://trac.sagemath.org/ticket/10513#comment:46>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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