ECL out of memory error

[Jonathan Thornburg]

A Sage program of mine recently aborted with an error traceback
(given in full below) ending with

> TypeError: ECL says: Memory limit reached. Please jump to an outer pointer, quit
> program and enlarge the
> memory limits before executing the program again.

How is the ECL memory limit configured? (From looking around with 'ps'
and 'top' while Sage is running, I don't think I'm hitting any OS-level
process-size limit.)

--- begin full error traceback ---
RuntimeError Traceback (most recent call last)
/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/interface.py in __init__(self, parent, value, is_name, name)
731 try:
--> 732 self._name = parent._create(value, name=name)
733 except (TypeError, RuntimeError, ValueError) as x:

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py in _create(self, value, name)
607 else:
--> 608 self.set(name, value)
609 except RuntimeError as error:

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py in set(self, var, value)
515 cmd = '%s : %s$'%(var, value.rstrip(';'))
--> 516 self.eval(cmd)
517

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/maxima_lib.py in _eval_line(self, line, locals, reformat, **kwds)
461 if statement:
--> 462 maxima_eval("#$%s$" % statement)
463 if not reformat:

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/libs/ecl.pyx in sage.libs.ecl.EclObject.__call__ (build/cythonized/sage/libs/ecl.c:8438)()
837 lispargs = EclObject(list(args))
--> 838 return ecl_wrap(ecl_safe_apply(self.obj,(<EclObject>lispargs).obj))
839

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/libs/ecl.pyx in sage.libs.ecl.ecl_safe_apply (build/cythonized/sage/libs/ecl.c:5980)()
358 else:
--> 359 raise RuntimeError("ECL says: {}".format(message))
360 else:

RuntimeError: ECL says: Memory limit reached. Please jump to an outer pointer, quit program and enlarge the
memory limits before executing the program again.

During handling of the above exception, another exception occurred:

TypeError Traceback (most recent call last)
<ipython-input-53-f6deabe57357> in <module>
1 do_Einstein(ell=ell, emm=emm, parity='generic',
2 eqn_numbers_to_solve=(),
----> 3 result_name_prefix='generic_')

<string> in do_Einstein(ell, emm, parity, rescale_G_dd_factors, rescale_G_dd_name_prefixes, eqn_numbers_to_solve, result_name_prefix)

<string> in separate_Lorenz_gauge_eqns(ell, emm, G_dd)

<string> in simplify_expression(expr)

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression.simplify_full (build/cythonized/sage/symbolic/expression.cpp:81694)()
10664 x = self
10665 x = x.simplify_factorial()
> 10666 x = x.simplify_rectform()
10667 x = x.simplify_trig()
10668 x = x.simplify_rational()

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression.simplify_rectform (build/cythonized/sage/symbolic/expression.cpp:83162)()
10815
10816 """
> 10817 simplified_expr = self.rectform()
10818
10819 if complexity_measure is None:

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression.rectform (build/cythonized/sage/symbolic/expression.cpp:81206)()
10496 0.0
10497 """
> 10498 return self.maxima_methods().rectform()
10499
10500 def unhold(self, exclude=None):

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/symbolic/maxima_wrapper.py in __call__(self, *args, **kwds)
30 """
31 return super(MaximaFunctionElementWrapper, self).__call__(*args,
---> 32 **kwds).sage()
33
34 class MaximaWrapper(SageObject):

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/interface.py in __call__(self, *args, **kwds)
691
692 def __call__(self, *args, **kwds):
--> 693 return self._obj.parent().function_call(self._name, [self._obj] + list(args), kwds)
694
695 def help(self):

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/interface.py in function_call(self, function, args, kwds)
611 [s.name() for s in args],
612 ['%s=%s'%(key,value.name()) for key, value in kwds.items()])
--> 613 return self.new(s)
614
615 def _function_call_string(self, function, args, kwds):

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/interface.py in new(self, code)
380
381 def new(self, code):
--> 382 return self(code)
383
384 ###################################################################

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/interface.py in __call__(self, x, name)
293
294 if isinstance(x, str):
--> 295 return cls(self, x, name=name)
296 try:
297 # Special methods do not and should not have an option to

/usr/local/sage/sage-9.5.beta8/local/var/lib/sage/venv-python3.7/lib/python3.7/site-packages/sage/interfaces/interface.py in __init__(self, parent, value, is_name, name)
732 self._name = parent._create(value, name=name)
733 except (TypeError, RuntimeError, ValueError) as x:
--> 734 raise TypeError(x)
735
736 def _latex_(self):

TypeError: ECL says: Memory limit reached. Please jump to an outer pointer, quit program and enlarge the
memory limits before executing the program again.
sage: Exiting Sage (CPU time 90m12.99s, Wall time 90m16.79s).
--- end full error traceback ---

thanks, keep safe and COVID-free,
--
-- "Jonathan Thornburg [remove color- to reply]" <jthor...@pink-gmail.com>
on the west coast of Canada, eh?
"There was of course no way of knowing whether you were being watched
at any given moment. How often, or on what system, the Thought Police
plugged in on any individual wire was guesswork. It was even conceivable
that they watched everybody all the time." -- George Orwell, "1984"

[Jonathan Thornburg]

In <https://groups.google.com/g/sage-devel/c/k414Ctfj42o/m/4xM0c0OhBAAJ>

I wrote:
> A Sage program of mine recently aborted with an error traceback
> (given in full below) ending with
>
> > TypeError: ECL says: Memory limit reached. Please jump to an outer pointer, quit
> > program and enlarge the
> > memory limits before executing the program again.
>
> How is the ECL memory limit configured? (From looking around with 'ps'
> and 'top' while Sage is running, I don't think I'm hitting any OS-level
> process-size limit.)

[[...]]

For the archives: On further investigation it's clear I was wrong.
I was indeed hitting an OS-level process-size limit, and increasing
that limit resolved my problems. I'm sorry for the false problem
report.