2007-08-15 11:28:22 -03:00
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:mod:`gc` --- Garbage Collector interface
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=========================================
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.. module:: gc
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:synopsis: Interface to the cycle-detecting garbage collector.
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2007-08-15 11:28:22 -03:00
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.. moduleauthor:: Neil Schemenauer <nas@arctrix.com>
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.. sectionauthor:: Neil Schemenauer <nas@arctrix.com>
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2016-06-11 16:02:54 -03:00
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--------------
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This module provides an interface to the optional garbage collector. It
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provides the ability to disable the collector, tune the collection frequency,
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and set debugging options. It also provides access to unreachable objects that
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the collector found but cannot free. Since the collector supplements the
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reference counting already used in Python, you can disable the collector if you
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are sure your program does not create reference cycles. Automatic collection
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can be disabled by calling ``gc.disable()``. To debug a leaking program call
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``gc.set_debug(gc.DEBUG_LEAK)``. Notice that this includes
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``gc.DEBUG_SAVEALL``, causing garbage-collected objects to be saved in
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gc.garbage for inspection.
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The :mod:`gc` module provides the following functions:
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.. function:: enable()
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Enable automatic garbage collection.
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.. function:: disable()
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Disable automatic garbage collection.
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.. function:: isenabled()
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2019-11-12 10:57:03 -04:00
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Return ``True`` if automatic collection is enabled.
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2016-10-25 03:00:03 -03:00
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.. function:: collect(generation=2)
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With no arguments, run a full collection. The optional argument *generation*
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may be an integer specifying which generation to collect (from 0 to 2). A
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:exc:`ValueError` is raised if the generation number is invalid. The number of
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unreachable objects found is returned.
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2010-02-06 14:46:57 -04:00
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The free lists maintained for a number of built-in types are cleared
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Merged revisions 64722,64729,64753,64845-64846,64849,64871,64880-64882,64885,64888,64897,64900-64901,64915,64926-64929,64938-64941,64944,64961,64966,64973 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
........
r64722 | georg.brandl | 2008-07-05 12:13:36 +0200 (Sat, 05 Jul 2008) | 4 lines
#2663: support an *ignore* argument to shutil.copytree(). Patch by Tarek Ziade.
This is a new feature, but Barry authorized adding it in the beta period.
........
r64729 | mark.dickinson | 2008-07-05 13:33:52 +0200 (Sat, 05 Jul 2008) | 5 lines
Issue 3188: accept float('infinity') as well as float('inf'). This
makes the float constructor behave in the same way as specified
by various other language standards, including C99, IEEE 754r,
and the IBM Decimal standard.
........
r64753 | gregory.p.smith | 2008-07-06 05:35:58 +0200 (Sun, 06 Jul 2008) | 4 lines
- Issue #2862: Make int and float freelist management consistent with other
freelists. Changes their CompactFreeList apis into ClearFreeList apis and
calls them via gc.collect().
........
r64845 | raymond.hettinger | 2008-07-10 16:03:19 +0200 (Thu, 10 Jul 2008) | 1 line
Issue 3301: Bisect functions behaved badly when lo was negative.
........
r64846 | raymond.hettinger | 2008-07-10 16:34:57 +0200 (Thu, 10 Jul 2008) | 1 line
Issue 3285: Fractions from_float() and from_decimal() accept Integral arguments.
........
r64849 | andrew.kuchling | 2008-07-10 16:43:31 +0200 (Thu, 10 Jul 2008) | 1 line
Wording changes
........
r64871 | raymond.hettinger | 2008-07-11 14:00:21 +0200 (Fri, 11 Jul 2008) | 1 line
Add cautionary note on the use of PySequence_Fast_ITEMS.
........
r64880 | amaury.forgeotdarc | 2008-07-11 23:28:25 +0200 (Fri, 11 Jul 2008) | 5 lines
#3317 in zipfile module, restore the previous names of global variables:
some applications relied on them.
Also remove duplicated lines.
........
r64881 | amaury.forgeotdarc | 2008-07-11 23:45:06 +0200 (Fri, 11 Jul 2008) | 3 lines
#3342: In tracebacks, printed source lines were not indented since r62555.
#3343: Py_DisplaySourceLine should be a private function. Rename it to _Py_DisplaySourceLine.
........
r64882 | josiah.carlson | 2008-07-12 00:17:14 +0200 (Sat, 12 Jul 2008) | 2 lines
Fix for the AttributeError in test_asynchat.
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r64885 | josiah.carlson | 2008-07-12 01:26:59 +0200 (Sat, 12 Jul 2008) | 2 lines
Fixed test for asyncore.
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r64888 | matthias.klose | 2008-07-12 09:51:48 +0200 (Sat, 12 Jul 2008) | 2 lines
- Fix bashisms in Tools/faqwiz/move-faqwiz.sh
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r64897 | benjamin.peterson | 2008-07-12 22:16:19 +0200 (Sat, 12 Jul 2008) | 1 line
fix various doc typos #3320
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r64900 | alexandre.vassalotti | 2008-07-13 00:06:53 +0200 (Sun, 13 Jul 2008) | 2 lines
Fixed typo.
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r64901 | benjamin.peterson | 2008-07-13 01:41:19 +0200 (Sun, 13 Jul 2008) | 1 line
#1778443 robotparser fixes from Aristotelis Mikropoulos
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r64915 | nick.coghlan | 2008-07-13 16:52:36 +0200 (Sun, 13 Jul 2008) | 1 line
Fix issue 3221 by emitting a RuntimeWarning instead of raising SystemError when the parent module can't be found during an absolute import (likely due to non-PEP 361 aware code which sets a module level __package__ attribute)
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r64926 | martin.v.loewis | 2008-07-13 22:31:49 +0200 (Sun, 13 Jul 2008) | 2 lines
Add turtle into the module index.
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r64927 | alexandre.vassalotti | 2008-07-13 22:42:44 +0200 (Sun, 13 Jul 2008) | 3 lines
Issue #3274: Use a less common identifier for the temporary variable
in Py_CLEAR().
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r64928 | andrew.kuchling | 2008-07-13 23:43:25 +0200 (Sun, 13 Jul 2008) | 1 line
Re-word
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r64929 | andrew.kuchling | 2008-07-13 23:43:52 +0200 (Sun, 13 Jul 2008) | 1 line
Add various items; move ctypes items into a subsection of their own
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r64938 | andrew.kuchling | 2008-07-14 02:35:32 +0200 (Mon, 14 Jul 2008) | 1 line
Typo fixes
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r64939 | andrew.kuchling | 2008-07-14 02:40:55 +0200 (Mon, 14 Jul 2008) | 1 line
Typo fix
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r64940 | andrew.kuchling | 2008-07-14 03:18:16 +0200 (Mon, 14 Jul 2008) | 1 line
Typo fix
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r64941 | andrew.kuchling | 2008-07-14 03:18:31 +0200 (Mon, 14 Jul 2008) | 1 line
Expand the multiprocessing section
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r64944 | gregory.p.smith | 2008-07-14 08:06:48 +0200 (Mon, 14 Jul 2008) | 7 lines
Fix posix.fork1() / os.fork1() to only call PyOS_AfterFork() in the child
process rather than both parent and child.
Does anyone actually use fork1()? It appears to be a Solaris thing
but if Python is built with pthreads on Solaris, fork1() and fork()
should be the same.
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r64961 | jesse.noller | 2008-07-15 15:47:33 +0200 (Tue, 15 Jul 2008) | 1 line
multiprocessing/connection.py patch to remove fqdn oddness for issue 3270
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r64966 | nick.coghlan | 2008-07-15 17:40:22 +0200 (Tue, 15 Jul 2008) | 1 line
Add missing NEWS entry for r64962
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r64973 | jesse.noller | 2008-07-15 20:29:18 +0200 (Tue, 15 Jul 2008) | 1 line
Revert 3270 patch: self._address is in pretty widespread use, need to revisit
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2008-07-16 09:55:28 -03:00
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whenever a full collection or collection of the highest generation (2)
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is run. Not all items in some free lists may be freed due to the
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particular implementation, in particular :class:`float`.
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2007-08-15 11:28:22 -03:00
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.. function:: set_debug(flags)
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Set the garbage collection debugging flags. Debugging information will be
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written to ``sys.stderr``. See below for a list of debugging flags which can be
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combined using bit operations to control debugging.
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.. function:: get_debug()
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Return the debugging flags currently set.
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2019-02-22 23:02:06 -04:00
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.. function:: get_objects(generation=None)
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Returns a list of all objects tracked by the collector, excluding the list
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returned. If *generation* is not None, return only the objects tracked by
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the collector that are in that generation.
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2019-02-22 23:02:06 -04:00
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.. versionchanged:: 3.8
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New *generation* parameter.
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2021-03-09 20:53:57 -04:00
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.. audit-event:: gc.get_objects generation gc.get_objects
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2012-10-30 18:43:19 -03:00
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.. function:: get_stats()
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Return a list of three per-generation dictionaries containing collection
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statistics since interpreter start. The number of keys may change
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in the future, but currently each dictionary will contain the following
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items:
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* ``collections`` is the number of times this generation was collected;
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* ``collected`` is the total number of objects collected inside this
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generation;
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* ``uncollectable`` is the total number of objects which were found
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to be uncollectable (and were therefore moved to the :data:`garbage`
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list) inside this generation.
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.. versionadded:: 3.4
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2007-08-15 11:28:22 -03:00
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.. function:: set_threshold(threshold0[, threshold1[, threshold2]])
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Set the garbage collection thresholds (the collection frequency). Setting
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*threshold0* to zero disables collection.
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The GC classifies objects into three generations depending on how many
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collection sweeps they have survived. New objects are placed in the youngest
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generation (generation ``0``). If an object survives a collection it is moved
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into the next older generation. Since generation ``2`` is the oldest
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generation, objects in that generation remain there after a collection. In
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order to decide when to run, the collector keeps track of the number object
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allocations and deallocations since the last collection. When the number of
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allocations minus the number of deallocations exceeds *threshold0*, collection
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starts. Initially only generation ``0`` is examined. If generation ``0`` has
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been examined more than *threshold1* times since generation ``1`` has been
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examined, then generation ``1`` is examined as well.
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With the third generation, things are a bit more complicated,
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see `Collecting the oldest generation <https://devguide.python.org/garbage_collector/#collecting-the-oldest-generation>`_ for more information.
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.. function:: get_count()
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Return the current collection counts as a tuple of ``(count0, count1,
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count2)``.
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.. function:: get_threshold()
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Return the current collection thresholds as a tuple of ``(threshold0,
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threshold1, threshold2)``.
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.. function:: get_referrers(*objs)
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Return the list of objects that directly refer to any of objs. This function
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will only locate those containers which support garbage collection; extension
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types which do refer to other objects but do not support garbage collection will
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not be found.
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Note that objects which have already been dereferenced, but which live in cycles
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and have not yet been collected by the garbage collector can be listed among the
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resulting referrers. To get only currently live objects, call :func:`collect`
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before calling :func:`get_referrers`.
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.. warning::
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Care must be taken when using objects returned by :func:`get_referrers` because
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some of them could still be under construction and hence in a temporarily
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invalid state. Avoid using :func:`get_referrers` for any purpose other than
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debugging.
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2021-03-09 20:53:57 -04:00
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.. audit-event:: gc.get_referrers objs gc.get_referrers
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2007-08-15 11:28:22 -03:00
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.. function:: get_referents(*objs)
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Return a list of objects directly referred to by any of the arguments. The
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referents returned are those objects visited by the arguments' C-level
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:c:member:`~PyTypeObject.tp_traverse` methods (if any), and may not be all objects actually
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directly reachable. :c:member:`~PyTypeObject.tp_traverse` methods are supported only by objects
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that support garbage collection, and are only required to visit objects that may
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be involved in a cycle. So, for example, if an integer is directly reachable
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from an argument, that integer object may or may not appear in the result list.
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.. audit-event:: gc.get_referents objs gc.get_referents
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2009-03-23 15:52:06 -03:00
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.. function:: is_tracked(obj)
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2013-11-29 06:17:13 -04:00
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Returns ``True`` if the object is currently tracked by the garbage collector,
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``False`` otherwise. As a general rule, instances of atomic types aren't
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tracked and instances of non-atomic types (containers, user-defined
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objects...) are. However, some type-specific optimizations can be present
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in order to suppress the garbage collector footprint of simple instances
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(e.g. dicts containing only atomic keys and values)::
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>>> gc.is_tracked(0)
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False
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>>> gc.is_tracked("a")
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False
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>>> gc.is_tracked([])
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True
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>>> gc.is_tracked({})
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False
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>>> gc.is_tracked({"a": 1})
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False
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>>> gc.is_tracked({"a": []})
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True
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.. versionadded:: 3.1
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.. function:: is_finalized(obj)
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Returns ``True`` if the given object has been finalized by the
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garbage collector, ``False`` otherwise. ::
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>>> x = None
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>>> class Lazarus:
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... def __del__(self):
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... global x
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... x = self
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...
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>>> lazarus = Lazarus()
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>>> gc.is_finalized(lazarus)
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False
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>>> del lazarus
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>>> gc.is_finalized(x)
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True
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.. versionadded:: 3.9
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2017-10-16 16:49:41 -03:00
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.. function:: freeze()
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Freeze all the objects tracked by the garbage collector; move them to a
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permanent generation and ignore them in all the future collections.
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If a process will ``fork()`` without ``exec()``, avoiding unnecessary
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copy-on-write in child processes will maximize memory sharing and reduce
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overall memory usage. This requires both avoiding creation of freed "holes"
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in memory pages in the parent process and ensuring that GC collections in
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child processes won't touch the ``gc_refs`` counter of long-lived objects
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originating in the parent process. To accomplish both, call ``gc.disable()``
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early in the parent process, ``gc.freeze()`` right before ``fork()``, and
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``gc.enable()`` early in child processes.
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.. versionadded:: 3.7
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.. function:: unfreeze()
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Unfreeze the objects in the permanent generation, put them back into the
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oldest generation.
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.. versionadded:: 3.7
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.. function:: get_freeze_count()
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Return the number of objects in the permanent generation.
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.. versionadded:: 3.7
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2012-04-15 08:41:32 -03:00
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The following variables are provided for read-only access (you can mutate the
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values but should not rebind them):
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.. data:: garbage
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A list of objects which the collector found to be unreachable but could
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not be freed (uncollectable objects). Starting with Python 3.4, this
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list should be empty most of the time, except when using instances of
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C extension types with a non-``NULL`` ``tp_del`` slot.
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If :const:`DEBUG_SAVEALL` is set, then all unreachable objects will be
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added to this list rather than freed.
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.. versionchanged:: 3.2
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If this list is non-empty at :term:`interpreter shutdown`, a
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:exc:`ResourceWarning` is emitted, which is silent by default. If
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:const:`DEBUG_UNCOLLECTABLE` is set, in addition all uncollectable objects
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are printed.
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2013-07-30 14:59:21 -03:00
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.. versionchanged:: 3.4
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Following :pep:`442`, objects with a :meth:`~object.__del__` method don't end
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up in :attr:`gc.garbage` anymore.
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.. data:: callbacks
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A list of callbacks that will be invoked by the garbage collector before and
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after collection. The callbacks will be called with two arguments,
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*phase* and *info*.
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*phase* can be one of two values:
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"start": The garbage collection is about to start.
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"stop": The garbage collection has finished.
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*info* is a dict providing more information for the callback. The following
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keys are currently defined:
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"generation": The oldest generation being collected.
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"collected": When *phase* is "stop", the number of objects
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successfully collected.
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"uncollectable": When *phase* is "stop", the number of objects
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that could not be collected and were put in :data:`garbage`.
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Applications can add their own callbacks to this list. The primary
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use cases are:
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Gathering statistics about garbage collection, such as how often
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various generations are collected, and how long the collection
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takes.
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Allowing applications to identify and clear their own uncollectable
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types when they appear in :data:`garbage`.
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.. versionadded:: 3.3
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The following constants are provided for use with :func:`set_debug`:
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.. data:: DEBUG_STATS
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Print statistics during collection. This information can be useful when tuning
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the collection frequency.
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.. data:: DEBUG_COLLECTABLE
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Print information on collectable objects found.
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.. data:: DEBUG_UNCOLLECTABLE
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Print information of uncollectable objects found (objects which are not
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reachable but cannot be freed by the collector). These objects will be added
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to the ``garbage`` list.
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.. versionchanged:: 3.2
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Also print the contents of the :data:`garbage` list at
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:term:`interpreter shutdown`, if it isn't empty.
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.. data:: DEBUG_SAVEALL
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When set, all unreachable objects found will be appended to *garbage* rather
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than being freed. This can be useful for debugging a leaking program.
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.. data:: DEBUG_LEAK
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The debugging flags necessary for the collector to print information about a
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leaking program (equal to ``DEBUG_COLLECTABLE | DEBUG_UNCOLLECTABLE |
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DEBUG_SAVEALL``).
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