$ vm_stat
Mach Virtual Memory Statistics: (page size of 4096 bytes)
Pages free:                          70104.
Pages active:                       451608.
Pages inactive:                     146907.
Pages speculative:                   25993.
Pages wired down:                    91606.
"Translation faults":            335008193.
Pages copy-on-write:              18718373.
Pages zero filled:               144137680.
Pages reactivated:                  964868.
Pageins:                           1103930.
Pageouts:                           253226.
Object cache: 60 hits of 23934184 lookups (0% hit rate)