Linux server administration/sar/sar -r

09:38:01 PM kbmemfree  kbavail kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit  kbactive   kbinact   kbdirty 09:39:01 PM   122.1G    478.5G    381.5G     75.8%    385.4M    348.8G     25.4G      5.0%     39.7G    330.0G     96.2M 09:40:01 PM   118.7G    478.5G    384.9G     76.4%    385.5M    352.1G     25.4G      5.0%     39.8G    333.2G    406.1M 09:41:01 PM   116.1G    478.4G    387.4G     76.9%    385.6M    354.6G     25.4G      5.0%     39.9G    335.7G    259.2M

Activities

 * 1) Emptying the buffers cache:
 * 2) Use   with   to fill up your cache.