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........
  r70546 | antoine.pitrou | 2009-03-23 19:41:45 +0100 (lun., 23 mars 2009) | 9 lines

  Issue #4688: Add a heuristic so that tuples and dicts containing only
  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 18:52:06 +00:00
parent 17e4fddb57
commit 3a652b1d0a
11 changed files with 397 additions and 2 deletions
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30
Modules/gcmodule.c
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@ -433,7 +433,13 @@ move_unreachable(PyGC_Head *young, PyGC_Head *unreachable)
(void) traverse(op,
(visitproc)visit_reachable,
(void *)young);
next = gc->gc.gc_next;
next = gc->gc.gc_next;
if (PyTuple_CheckExact(op)) {
_PyTuple_MaybeUntrack(op);
}
else if (PyDict_CheckExact(op)) {
_PyDict_MaybeUntrack(op);
}
}
else {
/* This *may* be unreachable. To make progress,
@ -1229,6 +1235,26 @@ gc_get_objects(PyObject *self, PyObject *noargs)
return result;
}
PyDoc_STRVAR(gc_is_tracked__doc__,
"is_tracked(obj) -> bool\n"
"\n"
"Returns true if the object is tracked by the garbage collector.\n"
"Simple atomic objects will return false.\n"
);
static PyObject *
gc_is_tracked(PyObject *self, PyObject *obj)
{
PyObject *result;
if (PyObject_IS_GC(obj) && IS_TRACKED(obj))
result = Py_True;
else
result = Py_False;
Py_INCREF(result);
return result;
}
PyDoc_STRVAR(gc__doc__,
"This module provides access to the garbage collector for reference cycles.\n"
@ -1243,6 +1269,7 @@ PyDoc_STRVAR(gc__doc__,
"set_threshold() -- Set the collection thresholds.\n"
"get_threshold() -- Return the current the collection thresholds.\n"
"get_objects() -- Return a list of all objects tracked by the collector.\n"
"is_tracked() -- Returns true if a given object is tracked.\n"
"get_referrers() -- Return the list of objects that refer to an object.\n"
"get_referents() -- Return the list of objects that an object refers to.\n");
@ -1258,6 +1285,7 @@ static PyMethodDef GcMethods[] = {
{"collect", (PyCFunction)gc_collect,
METH_VARARGS | METH_KEYWORDS, gc_collect__doc__},
{"get_objects", gc_get_objects,METH_NOARGS, gc_get_objects__doc__},
{"is_tracked", gc_is_tracked, METH_O, gc_is_tracked__doc__},
{"get_referrers", gc_get_referrers, METH_VARARGS,
gc_get_referrers__doc__},
{"get_referents", gc_get_referents, METH_VARARGS,