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I am using Ubuntu 13.10 on a computer with 3072 MB RAM and 20 GB swap. It is an HP G62 laptop which overheats pretty regularly.
When I type
free -mt in the terminal the output is:
free -mt total used free shared buffers cached Mem: 2873 2741 132 0 9 1084 -/+ buffers/cache: 1648 1225 Swap: 19529 42 19487 Total: 22403 2784 19619
Note the free memory: 132 MB!! The maximum free memory I have observed is 750 MB directly after startup. Whats happening???
also note the temperatures:
sensors acpitz-virtual-0 Adapter: Virtual device temp1: +78.0°C (crit = +99.0°C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +75.0°C (high = +80.0°C, crit = +90.0°C) Core 2: +72.0°C (high = +80.0°C, crit = +90.0°C)