How to Check Swap Activity (sar -w)
Use the sar -w command to report swapping and switching activity.
$ sar -w 00:00:00 swpin/s bswin/s swpot/s bswot/s pswch/s 01:00:00 0.00 0.0 0.00 0.0 22 |
Target values and observations are described in the table below.
Table 36-19 Output From the sar -w Command|
Field Name |
Description |
|---|---|
|
swpin/s |
The number of LWP transfers into memory per second. |
|
bswin/s |
The average number of processes swapped out of memory per second. If the number is greater than 1, you may need to increase memory. |
|
swpot/s |
The average number of processes swapped out of memory per second. If the number is greater than 1, you may need to increase memory. |
|
bswot/s |
The number of blocks transferred for swap-outs per second. |
|
pswch/s |
The number of kernel thread switches per second. |
Note -
All process swap-ins include process initialization.
Example--Checking Swap Activity
The following example shows output from the sar -w command.
$ sar -w SunOS venus 5.8 Generic sun4u 09/07/99 00:00:00 swpin/s bswin/s swpot/s bswot/s pswch/s 01:00:00 0.00 0.0 0.00 0.0 22 02:00:02 0.00 0.0 0.00 0.0 22 03:00:00 0.00 0.0 0.00 0.0 22 04:00:00 0.00 0.0 0.00 0.0 22 05:00:01 0.00 0.0 0.00 0.0 22 06:00:00 0.00 0.0 0.00 0.0 22 07:00:00 0.00 0.0 0.00 0.0 22 08:00:01 0.00 0.0 0.00 0.0 22 08:20:00 0.00 0.0 0.00 0.0 22 08:40:00 0.00 0.0 0.00 0.0 22 09:00:00 0.00 0.0 0.00 0.0 22 09:20:00 0.00 0.0 0.00 0.0 22 09:40:00 0.00 0.0 0.00 0.0 22 10:00:00 0.00 0.0 0.00 0.0 22 10:20:00 0.00 0.0 0.00 0.0 22 10:40:01 0.00 0.0 0.00 0.0 23 11:00:00 0.00 0.0 0.00 0.0 144 Average 0.00 0.0 0.00 0.0 24 |
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