Usage: /usr/bin/ceph_test_alloc_replay <log_to_replay|free-dump>  raw_duplicates|duplicates|free_dump|assess_free <alloc_unit>|try_alloc <count> <want> <alloc_unit>|replay_alloc <alloc_list_file|export_binary <out_file>|free_histogram [<alloc_unit>] [<num_buckets>]