#8772: Maxima interface chokes randomly
--------------------------+-------------------------------------------------
Reporter: dunfield | Owner: was
Type: defect | Status: new
Priority: critical | Milestone: sage-4.5.3
Component: interfaces | Keywords: Maxima
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by leif):
I could reproduce Nathan's error with Sage 4.5.3.rc0 on Ubuntu 10.04
x86_64 (Core2), but only in conjunction with heavy system load:
{{{
13943 a - 1
13944 a - 1
13945---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/leif/Sage/sage-4.5.3.rc0/<ipython console> in <module>()
/home/leif/Sage/sage-4.5.3.rc0/<ipython console> in prob()
/home/leif/Sage/sage-4.5.3.rc0/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.numerator
(sage/symbolic/expression.cpp:21226)()
/home/leif/Sage/sage-4.5.3.rc0/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression._maxima_
(sage/symbolic/expression.cpp:3382)()
/home/leif/Sage/sage-4.5.3.rc0/local/lib/python2.6/site-
packages/sage/structure/sage_object.so in
sage.structure.sage_object.SageObject._interface_
(sage/structure/sage_object.c:3501)()
/home/leif/Sage/sage-4.5.3.rc0/local/lib/python2.6/site-
packages/sage/interfaces/expect.pyc in __call__(self, x, name)
1030
1031 if isinstance(x, basestring):
-> 1032 return cls(self, x, name=name)
1033 try:
1034 return self._coerce_from_special_method(x)
/home/leif/Sage/sage-4.5.3.rc0/local/lib/python2.6/site-
packages/sage/interfaces/expect.pyc in __init__(self, parent, value,
is_name, name)
1449 except (TypeError, KeyboardInterrupt, RuntimeError,
ValueError), x:
1450 self._session_number = -1
-> 1451 raise TypeError, x
1452 self._session_number = parent._session_number
1453
TypeError: Error executing code in Maxima
CODE:
sage75684 : ((a)+(-1))*((a)^(-1))$
Maxima ERROR:
Incorrect syntax: Illegal use of delimiter )
(%i529800) Incorrect syntax: Premature termination of input at $.
(%i529801)
sage:
}}}
(I've added {{{print i, }}} to the last line of his example.)
Doctesting in parallel with 32 threads ({{{ptestlong}}}) btw. gave no
errors. I'll have to inspect the log of the run with 64 threads, but IIRC
there was only one "intentional" timeout due to SIGALARM set to 1
second... (128 threads exceeded my physical memory, i.e. caused massive
swapping.)
I couldn't post this earlier either because of trac errors... ;-)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8772#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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