#14625: lrcalc calls exit()
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Reporter: thansen | Owner: jdemeyer
Type: defect | Status: new
Priority: major | Milestone: sage-5.10
Component: packages: standard | Keywords: spkg, library
Work issues: | Report Upstream: Reported upstream.
Developers acknowledge bug.
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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While packaging lrcalc for Debian, our qa tool lintian detected that the
lrcalc library is calling exit(). And indeed, it calls exit and shuts down
Sage every time it runs out of memory, in mathlib/alloc.c.
We already discussed this with the upstream author Anders Skovsted Buch
and with Nicolas Thiéry. It's a bug in lrcalc, but since Anders has no
time to fix it, one could fix it in Sage first. Normally one would make
the library report an error and let the program using the library handle
it. The problem is that lrcalc does not free its memory and returns to a
clean state after an error. Anders says this would be difficult to
achieve. A workaround would be to perform each calculation in a new thread
that is thrown away in the case of an error.
Version: 1.1.6
Steps to reproduce:
Limit the memory for this shell to 900 MB so the memory will quickly be
full:[[BR]]
ulimit -Sv 900000
Start Sage and run a lrcalc command that needs a lot of memory:[[BR]]
sage[[BR]]
sage: import sage.libs.lrcalc.lrcalc as lrcalc[[BR]]
sage: sage.libs.lrcalc.lrcalc.mult([20, 19, 18, 17, 16, 15, 14, 13, 12,
11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1], [20, 19, 18, 17, 16, 15, 14, 13, 12,
11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1])
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14625>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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