Clear swap in Centos

Print memory usage

[root@localhost]# free -m
             total       used       free     shared    buffers     cached
Mem:         15658      11521       4137          0         17       4398
-/+ buffers/cache:       7105       8553
Swap:         4095       3995        100

Clear swap (may take a time)

[root@localhost]# swapoff -a && swapon -a

Memory usage after swap clearing

[root@localhost]# free -m
             total       used       free     shared    buffers     cached
Mem:         15658      15490        168          0         21       4437
-/+ buffers/cache:      11030       4627
Swap:         4095          4       4091

 

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