Running cache2_test, I get this failure:

```
$ ./cache2_test 
==== Test CacheTest.HitAndMiss
==== Test CacheTest.Erase
==== Test CacheTest.EntriesArePinned
==== Test CacheTest.EvictionPolicy
==== Test CacheTest.HeavyEntries
==== Test CacheTest.FlushedEntries
==== Test CacheTest.FileCacheExpire
util/cache2_test.cc:246: failed: 94371840 == 188743680
```

Running OS/X 10.8.5 with the latest XCode (5.0)