I have a CentOS 6.7 64 bit machine having 64GB RAM. When running free command it shows that it is using about 1420 MB of Swap space. My question is how to know which process is using Swap?
# free -m
total used free shared buffers cached
Mem: 64410 60119 4291 14534 426 56235
-/+ buffers/cache: 3456 60953
Swap: 32271 1420 30851
Since the machine has good enough RAM I don't think it should need to use Swap.