::check free swap::

bash-3.1# free -bt
total used free shared buffers cached
Mem: 513269760 502034432 11235328 0 15708160 217698304
-/+ buffers/cache: 268627968 244641792
Swap: 1028116480 0 1028116480
Total: 1541386240 502034432 1039351808
bash-3.1#