2. VmStat – Virtual Memory Statistics

Linux VmStat command used to display statistics of virtual memorykernerl threadsdisks,system processesI/O blocksinterruptsCPU activity and much more. By default vmstat command is not available under Linux systems you need to install a package called sysstat that includes a vmstat program. The common usage of command format is.

# vmstat

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r  b   swpd   free  inact active   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 810420  97380  70628    0    0   115     4   89   79  1  6 90  3  0