To find out the amount of physical memory:

  dmidecode -t 17 | grep "Size.*MB"
  

To check memory utilisation:

  free -m

This will show the real memory utilsation for a Linux server (i.e. without the disk cache). Look at the +/- buffers line

To check the amount of memory each process is using:

  ps -e -o pid,vsz,comm= | sort -n -k 2  

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