#940: read large output from octave (and probably matlab) takes *forever*
--------------------------+-------------------------------------------------
Reporter: was | Owner: mhansen
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.1
Component: interfaces | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
--------------------------+-------------------------------------------------
Changes (by SimonKing):
* upstream: => N/A
Comment:
I started with
{{{
sage: t = '"%s"'%10^10000 # ten thousand character string.
sage: a = octave(t)
}}}
which took little time.
Then, I did
{{{
sage: s = repr(a)
}}}
which I had to interrupt.
Pressing Ctrl-c made the message
{{{
^CInterrupting Octave...
}}}
appear on screen, but nothing more happened. Then, I pressed Ctrl-c again,
and finally the traceback was shown:
{{{
^CERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (80, 0))
---------------------------------------------------------------------------
KeyboardInterrupt Traceback (most recent call
last)
/home/king/<ipython console> in <module>()
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/interfaces/expect.pyc in __repr__(self)
1738 try:
1739 if self._get_using_file:
-> 1740 s = self.parent().get_using_file(self._name)
1741 except AttributeError:
1742 s = self.parent().get(self._name)
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/interfaces/expect.pyc in get_using_file(self, var)
1262 if you're reading it through introspection and seeing
this.
1263 """
-> 1264 return self.get(var)
1265
1266 def clear(self, var):
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/interfaces/octave.pyc in get(self, var)
311 ' 2'
312 """
--> 313 s = self.eval('%s'%var)
314 i = s.find('=')
315 return s[i+1:]
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/interfaces/expect.pyc in eval(self, code, strip,
synchronize, locals, **kwds)
1048 try:
1049 with gc_disabled():
-> 1050 return '\n'.join([self._eval_line(L, **kwds) for L
in code.split('\n') if L != ''])
1051 except KeyboardInterrupt:
1052 # DO NOT CATCH KeyboardInterrupt, as it is being
caught
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/interfaces/expect.pyc in _eval_line(self, line,
allow_use_file, wait_for_prompt)
733 out = '\n\r'
734 except KeyboardInterrupt:
--> 735 self._keyboard_interrupt()
736 raise KeyboardInterrupt, "Ctrl-c pressed while running
%s"%self
737 i = out.find("\n")
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/interfaces/expect.pyc in _keyboard_interrupt(self)
750 else:
751 self._expect.sendline(chr(3)) # send ctrl-c
--> 752 self._expect.expect(self._prompt)
753 self._expect.expect(self._prompt)
754 raise KeyboardInterrupt, "Ctrl-c pressed while running
%s"%self
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-packages/pexpect.pyc
in expect(self, pattern, timeout, searchwindowsize)
910 """
911 compiled_pattern_list = self.compile_pattern_list(pattern)
--> 912 return self.expect_list(compiled_pattern_list, timeout,
searchwindowsize)
913
914 def expect_list(self, pattern_list, timeout = -1,
searchwindowsize = -1):
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-packages/pexpect.pyc
in expect_list(self, pattern_list, timeout, searchwindowsize)
961 raise TIMEOUT ('Timeout exceeded in
expect_list().')
962 # Still have time left, so read more data
--> 963 c = self.read_nonblocking (self.maxread, timeout)
964 incoming = incoming + c
965 if timeout is not None:
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-packages/pexpect.pyc
in read_nonblocking(self, size, timeout)
542 raise EOF ('End Of File (EOF) in
read_nonblocking(). Pokey platform.')
543
--> 544 r, w, e = select.select([self.child_fd], [], [], timeout)
545 if not r:
546 if not self.isalive():
/mnt/local/king/SAGE/broken/local/lib/python2.6/site-
packages/sage/interfaces/get_sigs.pyc in my_sigint(x, n)
7
8 def my_sigint(x, n):
----> 9 raise KeyboardInterrupt
10
11 def my_sigfpe(x, n):
KeyboardInterrupt:
}}}
And then, I tried to repeat
{{{
sage: a = octave(t)
}}}
Now, it took forever, even though the first execution of the line only
took a second or so.
Hence, apparently, more is broken than just the output. Perhaps the two
problems have a common root?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/940#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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