python · vstinner · Sep 1, 2017 · Sep 1, 2017
diff --git a/Lib/test/libregrtest/refleak.py b/Lib/test/libregrtest/refleak.py
@@ -68,6 +68,14 @@ def dash_R(the_module, test, indirect_test, huntrleaks):
        for obj in abc.__subclasses__() + [abc]:
            abcs[obj] = obj._abc_registry.copy()

+    # bpo-31217: Integer pool to get a single integer object for the same
+    # value. The pool is used to prevent false alarm when checking for memory
+    # block leaks. Fill the pool with values in -1000..1000 which are the most
+    # common (reference, memory block, file descriptor) differences.
+    int_pool = {value: value for value in range(-1000, 1000)}
+    def get_pooled_int(value):
+        return int_pool.setdefault(value, value)
+
    nwarmup, ntracked, fname = huntrleaks
    fname = os.path.join(support.SAVEDCWD, fname)
    repcount = nwarmup + ntracked
@@ -86,9 +94,9 @@ def dash_R(the_module, test, indirect_test, huntrleaks):
                                                         abcs)
        print('.', end='', file=sys.stderr, flush=True)
        if i >= nwarmup:
-            rc_deltas[i] = rc_after - rc_before
-            alloc_deltas[i] = alloc_after - alloc_before
-            fd_deltas[i] = fd_after - fd_before
+            rc_deltas[i] = get_pooled_int(rc_after - rc_before)
+            alloc_deltas[i] = get_pooled_int(alloc_after - alloc_before)
+            fd_deltas[i] = get_pooled_int(fd_after - fd_before)
        alloc_before = alloc_after
        rc_before = rc_after
        fd_before = fd_after