rlcompleter on a heap is super expensive

[zhuyifei1999]

Not sure if this is fixable on our side, but I should document this:

$ python -i -c 'hp = __import__("guppy").hpy()'
>>> h = hp.heap()
>>> h.[TAB][TAB][HANGS]

GDB:

gef➤  py-bt
Traceback (most recent call first):
  File "/home/zhuyifei1999/guppy3/guppy/heapy/Classifiers.py", line 620, in owners
    self.mod.hv.update_dictowners(drg)
  File "/home/zhuyifei1999/guppy3/guppy/heapy/Classifiers.py", line 717, in owners
    return self.d.owners(X)
  File "/home/zhuyifei1999/guppy3/guppy/heapy/UniSet.py", line 1692, in get_owners
    return self.mod.Use.Clodo.classifier.owners(a)
  File "/home/zhuyifei1999/guppy3/guppy/heapy/UniSet.py", line 521, in <lambda>
    owners = property(lambda self: self.fam.get_owners(self), doc="""\
  <built-in method getattr of module object at remote 0x7f05681d4d10>
  File "/usr/lib/python3.7/rlcompleter.py", line 173, in attr_matches
    val = getattr(thisobject, word)
  File "/usr/lib/python3.7/rlcompleter.py", line 89, in complete
    self.matches = self.attr_matches(text)
gef➤  py-up
#11 Frame 0x559685b8fd90, for file /home/zhuyifei1999/guppy3/guppy/heapy/Classifiers.py, line 717, in owners (self=<ByClassOrDictOwner(mod=<Interface(_share=<Share(module=<module at remote 0x7f0567dead70>, parent=<Share(module=<module at remote 0x7f0567eda8f0>, parent=<Share(module=<module at remote 0x7f0568079f50>, parent=<Share(module=None, parent=<...>, name='', setable=(), chgable=(...), importedfrom={}, nowrap=(...), wrapattr=None, wrapping=0, data={'_parent': <...>, '_root': <...>, '_module': None, 'guppy': <...>, 'types': <Share(module=<module at remote 0x7f0568092110>, parent=<...>, name='types', setable=(...), chgable=(...), importedfrom={}, nowrap=(...), wrapattr=None, wrapping=0, data={'_parent': <...>, '_root': <...>, '_module': <module at remote 0x7f0568092110>, 'ModuleType': <type at remote 0x7f05692bc620>, 'CodeType': <type at remote 0x7f05692c1180>, 'FrameType': <type at remote 0x7f05692bee00>}, owners={}, ispackage=None, recursion=0, preload=(...)) at remote 0x7f0567e45ed0>, 'io': <Share(module=<...(truncated)
    return self.d.owners(X)
gef➤  
#15 Frame 0x559685a99280, for file /home/zhuyifei1999/guppy3/guppy/heapy/UniSet.py, line 1692, in get_owners (self=<IdentitySetFamily(mod=<Interface(_share=<Share(module=<module at remote 0x7f0567e700b0>, parent=<Share(module=<module at remote 0x7f0567eda8f0>, parent=<Share(module=<module at remote 0x7f0568079f50>, parent=<Share(module=None, parent=<...>, name='', setable=(), chgable=(...), importedfrom={}, nowrap=(...), wrapattr=None, wrapping=0, data={'_parent': <...>, '_root': <...>, '_module': None, 'guppy': <...>, 'types': <Share(module=<module at remote 0x7f0568092110>, parent=<...>, name='types', setable=(...), chgable=(...), importedfrom={}, nowrap=(...), wrapattr=None, wrapping=0, data={'_parent': <...>, '_root': <...>, '_module': <module at remote 0x7f0568092110>, 'ModuleType': <type at remote 0x7f05692bc620>, 'CodeType': <type at remote 0x7f05692c1180>, 'FrameType': <type at remote 0x7f05692bee00>}, owners={}, ispackage=None, recursion=0, preload=(...)) at remote 0x7f0567e45ed0>, 'io': <Share(module=<m...(truncated)
    return self.mod.Use.Clodo.classifier.owners(a)
gef➤  
#19 Frame 0x559685b90bb0, for file /home/zhuyifei1999/guppy3/guppy/heapy/UniSet.py, line 521, in <lambda> (self=<IdentitySetMulti at remote 0x7f0567ee4230>)
    owners = property(lambda self: self.fam.get_owners(self), doc="""\
gef➤  
#29 <built-in method getattr of module object at remote 0x7f05681d4d10>
gef➤  
#31 Frame 0x559685d6e970, for file /usr/lib/python3.7/rlcompleter.py, line 173, in attr_matches (self=<Completer(use_main_ns=1, namespace={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <type at remote 0x5596859dbe50>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f05681d4d10>, 'hp': <_GLUECLAMP_(_share=<Share(module=<module at remote 0x7f0567edaad0>, parent=<Share(module=<module at remote 0x7f0567eda8f0>, parent=<Share(module=<module at remote 0x7f0568079f50>, parent=<Share(module=None, parent=<...>, name='', setable=(), chgable=(...), importedfrom={}, nowrap=(...), wrapattr=None, wrapping=0, data={'_parent': <...>, '_root': <...>, '_module': None, 'guppy': <...>, 'types': <Share(module=<module at remote 0x7f0568092110>, parent=<...>, name='types', setable=(...), chgable=(...), importedfrom={}, nowrap=(...), wrapattr=None, wrapping=0, data={'_parent': <...>, '_root': <...>, '_module': <module at remote 0x7f0568092110>, 'ModuleType': <type at remote 0x7...(truncated)
    val = getattr(thisobject, word)
gef➤  py-print thisobject
local 'thisobject' = <IdentitySetMulti at remote 0x7f0567ee4230>
gef➤  py-print word
local 'word' = 'owners'
gef➤  py-print words
local 'words' = {'__doc__', '__new__', '_doc_nodes', 'owners', '__reduce__', '__getattr__', '__or__', '__subclasshook__', '__dir__', '__bool__', '__xor__', '__str__', '__delattr__', '__mul__', '__getattribute__', '__len__', 'pathsout', '__ge__', '__eq__', '__rand__', '__rxor__', '_partition', 'size', '__call__', 'fam', '__le__', '__and__', '_help_url_', 'test_contains', 'referrers', 'er', '__lshift__', '__hash__', '__sub__', '__class__', '__iter__', '_hiding_tag_', '__module__', 'more', '_instahelp_', 'bysize', '__contains__', '__format__', '_er', '__sizeof__', 'get_examples', 'biper', 'get_rp', 'byid', '__lt__', 'bytype', 'by', 'brief', 'byunity', 'parts', 'stat', '_origin_', 'nodes', 'partition', 'disjoint', 'doc', '_get_help', 'byclodo', '__gt__', '__repr__', '_derive_origin_', 'dump', 'kind', 'rp', 'dictof', '__rsub__', '__getitem__', 'get_render', 'shpaths', 'count', 'sp', 'indisize', '__setattr__', '__slots__', 'maprox', 'get_shpaths', 'referents', 'byrcs', 'byidset', 'get_ckc', '__init_subclass__', '__ne__', 'pathsin'...(truncated)
gef➤  py-list
 168                for word in words:
 169                    if (word[:n] == attr and
 170                        not (noprefix and word[:n+1] == noprefix)):
 171                        match = "%s.%s" % (expr, word)
 172                        try:
>173                            val = getattr(thisobject, word)
 174                        except Exception:
 175                            pass  # Include even if attribute not set
 176                        else:
 177                            match = self._callable_postfix(val, match)
 178                        matches.append(match)

This is https://github.com/python/cpython/blob/77abf23c67c1a465a8899666c69f6bcd6930e003/Lib/rlcompleter.py#L173, it wants to know whether each of out attributes are callable.