#15801: Categories over a base ring category
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Reporter: nthiery | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.2
Component: categories | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #10963 | Stopgaps:
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Comment (by nbruin):
A simple test that detects some of the problems #10963 presently causes:
{{{
while True: k=random_matrix(Rationals(),30,20).echelon_form()
}}}
On 6.2beta4 this happily runs with constant memory footprint and about
constant time per iteration.
With #10963 applied, it gradually eats memory. The reason is that
"integers mod p" and their categories pile up in memory. The iterations
also take about twice as long and they slow down over time (as one would
expect with memory use increasing).
(see #13925 for why the choice of algorithm might not be so sensible, but
it's a useful test for our purposes here)
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Ticket URL: <http://trac.sagemath.org/ticket/15801#comment:9>
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