#8772: Maxima interface chokes randomly
-------------------------------+--------------------------------------------
Reporter: dunfield | Owner: was
Type: defect | Status: new
Priority: critical | Milestone: sage-4.4
Component: interfaces | Keywords: Maxima
Author: Nathan Dunfield | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Sufficiently many calls to Maxima eventually causes that interface to
throw an exception, some samples of which are given below. A minimal
piece of code exhibiting this problem is
{{{
def prob():
for i in xrange(1000000):
a = var('a')
eqn = (a - 1)/(a)
eqn.numerator()
}}}
This error has been observed in Sage 4.3.* on OS X.5.* (8-core Xeon Mac
Pro and 2-core Intel Core 2 Mac Book), and Ubuntu Linux 9.10 (quad-core
Intel Core 2). See the sage-devel thread [http://groups.google.com/group
/sage-devel/browse_thread/thread/3b43147e44324c25] for some discussion.
In particular, it may be related to #5662 where the synchronization with
Maxima was getting lost on certain multi-core CPUs because of something
related to switching between cores. It takes some time, e.g. 5-15
minutes for the problem to manifest itself.
Typical errors:
{{{
TypeError: unable to make sense of Maxima expression
'"__SAGE_SYNCHRO_MARKER_202188656"' in Sage
TypeError: Error executing code in Maxima
CODE:
_tmp_ : -(a0-1)*a1^2*a3$
Maxima ERROR:
_tmp_ : -(a0-1)*a1^2*a3$
stdin:57338284:Incorrect syntax: Illegal use of delimiter )
(%i832002)
stdin:57338357:Incorrect syntax: Premature termination of input at ;.
(%i832003)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8772>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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