~$ free --mebi
              total        used        free      shared  buff/cache   available
Mem:            479         131          17           1         330         334
Swap:             0           0           0

~$ free --mebi
              total        used        free      shared  buff/cache   available
Mem:            392         289          28           2          74          89
Swap:             0           0           0

~$ dmesg | grep "Memory"
[    0.000000] Memory: 467376K/523892K available (12300K kernel code, 2394K rwdata, 3924K rodata, 2376K init, 2376K bss, 56516K reserved, 0K cma-reserved)

~$ dmesg | grep "Memory"
[    0.000000] Memory: 376860K/523832K available (14348K kernel code, 2578K rwdata, 4252K rodata, 2320K init, 2296K bss, 146972K reserved, 0K cma-reserved)