Index: trunk/py/misc/cache.py
===================================================================
--- trunk/py/misc/cache.py	(revision 58575)
+++ trunk/py/misc/cache.py	(revision 58576)
@@ -107,9 +107,6 @@
     # time function to use for measuring build-times
     _time = gettime
 
-    def __init__(self, maxentries=64):
-        super(BuildcostAccessCache, self).__init__(maxentries)
-
     def build(self, key, builder, *args, **kwargs):
         start = self._time()
         val = builder(*args, **kwargs)
Index: trunk/py/misc/testing/test_cache.py
===================================================================
--- trunk/py/misc/testing/test_cache.py	(revision 58575)
+++ trunk/py/misc/testing/test_cache.py	(revision 58576)
@@ -27,6 +27,12 @@
 
     def test_cache_works_somewhat_simple(self):
         cache = BuildcostAccessCache()
+        # the default ._time() call used by
+        # BuildcostAccessCache.build can 
+        # result into time()-time() == 0 which makes the below
+        # test fail randomly.  Let's rather use incrementing
+        # numbers instead. 
+        cache._time = py.std.itertools.count().next
         for x in range(cache.maxentries):
             y = cache.getorbuild(x, lambda: x)
             assert x == y