#11900: Serious regression caused by #9138
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Reporter: SimonKing | Owner: tbd
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.7.2
Component: performance | Keywords: categories regression
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Changes (by SimonKing):
* cc: nthiery (added)
Comment:
The next surprise is that (even if one avoids category initialisation of
matrix spaces) ''many'' covariant constructions (quotients and
subquotients) are called - that is another reason why `Category.join()` is
called so often.
Part of the problem may be that
`sage.categories.CovariantConstructionCategory.category_of` has been
defined as @class_method in #8881, not as @cached_function (one can see in
the code that cached_function has been considered, but was commented out).
So, perhaps it is worth while to try that change?
But first I need to find out where the quotients and subquotients actually
arise.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:11>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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