#8904: libsingular: memory leak in Matrix.act_on_polynomial
-------------------------+--------------------------------------------------
Reporter: SimonKing | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-4.4.2
Component: memleak | Keywords: libsingular act_on_polynomial memleak
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
-------------------------+--------------------------------------------------
There is a memory leak that occurs when mapping a multivariate polynomial
using a matrix:
{{{
sage: R.<a,b> = QQ[]
sage: M = Matrix([[0,1],[1,0]])
sage: n = 0
sage: p = R.random_element()
sage: q = M.act_on_polynomial(p)
sage: mem = get_memory_usage()
sage: while(1):
....: n+=1
....: q = M.act_on_polynomial(p)
....: if get_memory_usage()>mem:
....: mem = get_memory_usage()
....: print mem,n
....:
801.04296875 2
801.54296875 2011
802.04296875 4738
802.54296875 7406
803.04296875 10091
803.54296875 12809
804.04296875 15495
804.54296875 18171
805.04296875 20873
805.54296875 23561
806.04296875 26251
...
}}}
This does not occur if one maps the polynomial by a proper morphism:
{{{
sage: f = R.hom([M.act_on_polynomial(t) for t in R.gens()],R)
sage: while(1):
....: n+=1
....: q = f(p)
....: if get_memory_usage()>mem:
....: mem = get_memory_usage()
....: print mem,n
....:
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8904>
Sage <http://www.sagemath.org>
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