#14627: Make mod_int signed and speed up matrix_modn_dense_float
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Reporter: vbraun | Owner: jason, was
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.10
Component: linear algebra | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Description changed by vbraun:
Old description:
> As discussed on https://groups.google.com/d/msg/sage-
> devel/hnO8gT8VON4/YyZ5UCM5wUEJ, unsigned longs are much slower than
> signed longs when converted to a Python object.
New description:
As discussed on https://groups.google.com/d/msg/sage-
devel/hnO8gT8VON4/YyZ5UCM5wUEJ, unsigned longs are much slower than signed
longs when converted to a Python object.
Without patch about 20x slower than naive list-of-list implementation:
{{{
$ sage test_matrix_modn_float.py
setA:
5 loops, best of 50: 179 ms per loop
setB:
25 loops, best of 50: 10.3 ms per loop
}}}
With patch no performance difference:
{{{
$ sage test_matrix_modn_float.py
setA:
25 loops, best of 50: 11.5 ms per loop
setB:
25 loops, best of 50: 12.8 ms per loop
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14627#comment:1>
Sage <http://www.sagemath.org>
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