Patch #1953
I implemented the function sys._compact_freelists() and C API functions PyInt_/PyFloat_CompactFreeList() to compact the pre-allocated blocks of ints and floats. They allow the user to reduce the memory usage of a Python process that deals with lots of numbers.
The patch also renames sys._cleartypecache to sys._clear_type_cache
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index aafbfa3..a01ea3e 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -363,6 +363,24 @@
self.assertEqual(type(getattr(sys.flags, attr)), int, attr)
self.assert_(repr(sys.flags))
+ def test_clear_type_cache(self):
+ sys._clear_type_cache()
+
+ def test_compact_freelists(self):
+ sys._compact_freelists()
+ r = sys._compact_freelists()
+ # freed blocks shouldn't change
+ self.assertEqual(r[0][2], 0)
+ self.assertEqual(r[1][2], 0)
+ # fill freelists
+ ints = list(range(12000))
+ floats = [float(i) for i in ints]
+ del ints
+ del floats
+ # should free more than 200 blocks each
+ r = sys._compact_freelists()
+ self.assert_(r[0][2] > 200, r[0][2])
+ self.assert_(r[1][2] > 200, r[1][2])
def test_main():
test.test_support.run_unittest(SysModuleTest)