mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-09-27 10:50:04 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 13

Issue #4688: Add a heuristic so that tuples and dicts containing only

Browse source 
untrackable objects are not tracked by the garbage collector. This can
reduce the size of collections and therefore the garbage collection overhead
on long-running programs, depending on their particular use of datatypes.

(trivia: this makes the "binary_trees" benchmark from the Computer Language
Shootout 40% faster)
This commit is contained in:
Antoine Pitrou 2009-03-23 18:41:45 +00:00
parent e5b78563b6
commit f8387af262
11 changed files with 401 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

11
Include/objimpl.h
View file

@ -285,6 +285,17 @@ extern PyGC_Head *_PyGC_generation0;
g->gc.gc_next = NULL; \
} while (0);
/* True if the object is currently tracked by the GC. */
#define _PyObject_GC_IS_TRACKED(o) \
((_Py_AS_GC(o))->gc.gc_refs != _PyGC_REFS_UNTRACKED)
/* True if the object may be tracked by the GC in the future, or already is.
This can be useful to implement some optimizations. */
#define _PyObject_GC_MAY_BE_TRACKED(obj) \
(PyObject_IS_GC(obj) && \
(!PyTuple_CheckExact(obj) || _PyObject_GC_IS_TRACKED(obj)))
PyAPI_FUNC(PyObject *) _PyObject_GC_Malloc(size_t);
PyAPI_FUNC(PyObject *) _PyObject_GC_New(PyTypeObject *);
PyAPI_FUNC(PyVarObject *) _PyObject_GC_NewVar(PyTypeObject *, Py_ssize_t);