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System Administration Guide

How to Check Unused Memory (sar)

Use the sar -r command to report the number of memory pages and swap-file disk blocks that are currently unused. 


$ sar -r
SunOS venus 5.6 Generic sun4m    08/20/96
00:00:03 freemem freeswap
01:00:02     983   187590

Output from the -r option is described in Table 64-16.

Table 64-16 Output From the sar -r Command

Field Name 

Description 

freemem

The average number of memory pages available to user processes over the intervals sampled by the command. Page size is machine-dependent. 

freeswap

The number of 512-byte disk blocks available for page swapping. 

Example--Checking Unused Memory

The following example shows output from the sar -r command. 


$ sar -r
SunOS venus 5.6 Generic sun4m    08/20/96
14:28:12 freemem freeswap
14:29:12     268    3034
14:30:12     351    3009
14:31:12     297    3033
 
Average      306    3025