_gcdebug.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 07 Apr 2010 09:24:00 +0200
changeset 5173 73760bbb66bd
parent 4870 101858d845f7
child 5421 8167de96c523
permissions -rw-r--r--
[rql annotation] add test and fix for bug introduced by 5004:4cc020ee70e2. While it sounded good, it wasn't because stinfo['relations'] didn't include anymore stinfo['typerels']
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import gc, types, weakref
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from cubicweb.schema import CubicWebRelationSchema, CubicWebEntitySchema
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listiterator = type(iter([]))
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IGNORE_CLASSES = (
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    type, tuple, dict, list, set, frozenset, type(len),
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    weakref.ref, weakref.WeakKeyDictionary,
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    listiterator,
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    property, classmethod,
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    types.ModuleType, types.FunctionType, types.MethodType,
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    types.MemberDescriptorType, types.GetSetDescriptorType,
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    )
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def _get_counted_class(obj, classes):
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    for cls in classes:
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        if isinstance(obj, cls):
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            return cls
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    raise AssertionError()
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def gc_info(countclasses,
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            ignoreclasses=IGNORE_CLASSES,
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            viewreferrersclasses=(), showobjs=False, maxlevel=1):
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    gc.collect()
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    gc.collect()
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    counters = {}
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    ocounters = {}
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    for obj in gc.get_objects():
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        if isinstance(obj, countclasses):
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            cls = _get_counted_class(obj, countclasses)
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            try:
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                counters[cls.__name__] += 1
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            except KeyError:
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                counters[cls.__name__] = 1
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        elif not isinstance(obj, ignoreclasses):
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            try:
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                key = '%s.%s' % (obj.__class__.__module__,
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                                 obj.__class__.__name__)
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            except AttributeError:
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                key = str(obj)
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            try:
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                ocounters[key] += 1
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            except KeyError:
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                ocounters[key] = 1
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        if isinstance(obj, viewreferrersclasses):
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            print '   ', obj, referrers(obj, showobjs, maxlevel)
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    return counters, ocounters, gc.garbage
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def referrers(obj, showobj=False, maxlevel=1):
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    objreferrers = _referrers(obj, maxlevel)
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    try:
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        return sorted(set((type(x), showobj and x or getattr(x, '__name__', '%#x' % id(x)))
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                          for x in objreferrers))
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    except TypeError:
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        s = set()
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        unhashable = []
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        for x in objreferrers:
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            try:
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                s.add(x)
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            except TypeError:
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                unhashable.append(x)
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        return sorted(s) + unhashable
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def _referrers(obj, maxlevel, _seen=None, _level=0):
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    interesting = []
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    if _seen is None:
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        _seen = set()
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    for x in gc.get_referrers(obj):
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        if id(x) in _seen:
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            continue
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        _seen.add(id(x))
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        if isinstance(x, types.FrameType):
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            continue
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        if isinstance(x, (CubicWebRelationSchema, CubicWebEntitySchema)):
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            continue
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        if isinstance(x, (list, tuple, set, dict, listiterator)):
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            if _level >= maxlevel:
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                pass
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                #interesting.append(x)
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            else:
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                interesting += _referrers(x, maxlevel, _seen, _level+1)
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        else:
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            interesting.append(x)
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    return interesting