#20128: QEPCAD leaves zombies
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Reporter: yzh | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: interfaces | Resolution:
Keywords: QEPCAD, pexpect | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> Use qepcad to simplify formulas. It works fine on the following simple
> input.
> {{{
> sage: x, y = var('x,y')
> sage: ellipse = 3*x^2 + 2*x*y + y^2 - x + y - 7
> sage: circle = x^2 + y^2 - 3
> sage: qe = qepcad([ellipse < 0, circle < 0])
> sage: qe
> y^2 + 2 x y + y + 3 x^2 - x - 7 < 0 /\ y^2 + x^2 - 3 < 0
> }}}
> However, calling qepcad a few times causes a crash.
> {{{
> sage: qe = qepcad([ellipse < 0, circle < 0])
> sage: for i in range(200):
> ....: qe = qepcad([ellipse < 0, circle < 0])
> OSError: [Errno 35] Resource temporarily unavailable
> }}}
> One gets the following similar error if `interact=True` option is used.
> {{{
> RuntimeError: unable to start QEPCAD because the command
> 'env qe=/Users/yzh/sage/local qepcad' failed:
> Pexpect: pty.fork() failed: [Errno 35] Resource temporarily unavailable
> }}}
New description:
{{{
sage: x, y = var('x,y')
sage: ellipse = 3*x^2 + 2*x*y + y^2 - x + y - 7
sage: circle = x^2 + y^2 - 3
sage: for i in range(1000): qe = qepcad([ellipse < 0, circle < 0])
OSError: [Errno 35] Resource temporarily unavailable
}}}
One gets the following similar error if `interact=True` option is used.
{{{
RuntimeError: unable to start QEPCAD because the command
'env qe=/Users/yzh/sage/local qepcad' failed:
Pexpect: pty.fork() failed: [Errno 35] Resource temporarily unavailable
}}}
--
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Ticket URL: <http://trac.sagemath.org/ticket/20128#comment:11>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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