Practice

The given example demostrate how to monitor unused memory.

# SAR -r 2 2

17:59:24 freemem freeswp (-r)

17:59:26          25807  96000

17:59:28          25830  96000

Average           25818  96000

In the given example, Freemem refers to the free ram space. Freeswp denotes the free swap space.

Checking CPU Utilization

Note: A SAR command without any options is equal to SAR (-u). The processor may be either idle or busy. Whenever the processor is busy it is either in user mode or system mode. Whenever it is idle, it is either waits for I/O completion or is inactive.