# free total used free shared buffers Mem: 54136 22164 31972 5788 2660 -/+ buffers: 19504 34632 Swap: 0 0 0 54136 = 22164 + 31972 19504 + 34632 34632 = 31972 + 2660
実際の空きメモリは34632k
# free total used free shared buffers cached Mem: 4019128 606020 3413108 23588 91024 336744 -/+ buffers/cache: 178252 3840876 Swap: 4062204 0 4062204 4019128 = 606020 + 3413108 178252 + 3840876 3840876 = 3413108 + 91024 + 336744
実際の空きメモリは3840876k
$ free total used free shared buff/cache available Mem: 4028016 1315876 211500 32748 2500640 2336452 Swap: 0 0 0 4028016 = 1315876 + 211500 + 2500640
実際の空きメモリは availableの2336452k