#715: Parents probably not reclaimed due to too much caching
-------------------------------------------------------------------+--------
Reporter: robertwb |
Owner: somebody
Type: defect |
Status: needs_review
Priority: major |
Milestone: sage-5.4
Component: coercion |
Resolution:
Keywords: weak cache coercion Cernay2012 | Work
issues:
Report Upstream: N/A |
Reviewers: Jean-Pierre Flori, Simon King, Nils Bruin
Authors: Simon King, Jean-Pierre Flori | Merged
in:
Dependencies: #9138, #11900, #11599, to be merged with #11521 |
Stopgaps:
-------------------------------------------------------------------+--------
Comment (by nbruin):
Oh sigh ... this could be such a red herring. On bsd.math, there is a huge
difference between sage versions in how this piece of code behaves:
On `sage 5.4.beta0` (with patches):
{{{
sage: PF = WeylGroup(['A',3]).pieri_factors()
sage: %time a = PF.an_element()
CPU times: user 0.06 s, sys: 0.05 s, total: 0.11 s
Wall time: 43.57 s
}}}
On `sage 5.2beta1` (happens to be the system-wide sage install on bsd):
{{{
sage: PF = WeylGroup(['A',3]).pieri_factors()
sage: %time a = PF.an_element()
CPU times: user 0.06 s, sys: 0.05 s, total: 0.10 s
Wall time: 0.44 s
}}}
The 5.4b0 time is really anomalous. On another system, 5.3rc1+patches
behaves very comparably to 5.0 for me. So there is something fishy with
this.
The method eventually called, PF._an_element_, is a very interesting piece
of work. It's recursive and exercises the coercion system really well. So
lots of opportunities to foul up caches and memory. Implicated in all of
this, by the way:
{{{
class WeylGroup_gens(ClearCacheOnPickle, UniqueRepresentation,
MatrixGroup_gens)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/715#comment:282>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
