Hi all; I use an headless rpi with debian wheezy. I can't understand why the available memory decreases, as stated by top:
Boot, start tmux or screen:
top - 10:18:10 up 15 min, 1 user, load average: 0.07, 0.04, 0.07 Tasks: 82 total, 1 running, 81 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.3 us, 1.3 sy, 0.0 ni, 98.3 id, 0.0 wa, 0.0 hi, 0.0 si, KiB Mem: 494572 total, 75496 used, 419076 free, 12872 buffers KiB Swap: 102396 total, 0 used, 102396 free, 35484 cached
After starting tmux sessions (mail, web, torrent, shell)
top - 10:20:46 up 18 min, 1 user, load average: 0.20, 0.12, 0.10 Tasks: 96 total, 1 running, 95 sleeping, 0 stopped, 0 zombie %Cpu(s): 6.7 us, 1.7 sy, 0.0 ni, 89.9 id, 0.0 wa, 0.0 hi, 1.7 si, KiB Mem: 494572 total, 127240 used, 367332 free, 16248 buffers KiB Swap: 102396 total, 0 used, 102396 free, 52616 cached
After some hours (normal run)
top - 09:51:37 up 11:26, 1 user, load average: 0.05, 0.04, 0.05 Tasks: 96 total, 1 running, 95 sleeping, 0 stopped, 0 zombie %Cpu(s): 4.3 us, 1.7 sy, 0.0 ni, 94.1 id, 0.0 wa, 0.0 hi, 0.0 si, KiB Mem: 494572 total, 478880 used, 15692 free, 74304 buffers KiB Swap: 102396 total, 0 used, 102396 free, 326248 cached
As you can see the free memory decreases. Any idea? Is it a normal behaviour?
Thank a lot,