Hello, when shuffling the CopyOnWrite list with the standard Collections.shuffle method, performance anomalies occur, due to the fact that it calls the set method, which copies the array each time, a possible solution (crutch) is a random comparator for sorting, so sorting in COW is redefined to its own sub - blocking implementation
Another problem with Collections.shuffle is that it's not exactly thread safe because it calls the size() method; and then iterates from it, also COW does not support modification inside the iterator (works on snapshots) COWCollectionsShuffle 0,008 ops/ms COWListRandomSort 1,089 ops/ms syncListCollectionsShuffle 0,950 ops/ms
