How to Check CPU Utilization (sar -u)
Use the sar -u command to display CPU utilization statistics.
$ sar -u 00:00:00 %usr %sys %wio %idle 01:00:00 0 0 0 100 |
The sar command without any options is equivalent to sar -u. At any given moment, the processor is either busy or idle. When busy, the processor is in either user mode or system mode. When idle, the processor is either waiting for I/O completion or “sitting still” with no work to do.
The following table describes output from the -u option.
Table 24–17 Output From the sar -u Command|
Field Name |
Description |
|---|---|
|
%usr |
Lists the percentage of time that the processor is in user mode |
|
%sys |
Lists the percentage of time that the processor is in system mode |
|
%wio |
Lists the percentage of time that the processor is idle and waiting for I/O completion |
|
%idle |
Lists the percentage of time that the processor is idle and not waiting for I/O |
A high %wio generally means that a disk slowdown has occurred.
Example—Checking CPU Utilization
The following example shows output from the sar -u command.
$ sar -u SunOS venus 5.9 Generic sun4u 06/24/2001 00:00:00 %usr %sys %wio %idle 01:00:00 0 0 0 100 02:00:02 0 0 0 100 03:00:00 0 0 0 100 04:00:00 0 0 0 100 05:00:01 0 0 0 100 06:00:00 0 0 0 100 07:00:00 0 0 0 100 08:00:01 0 0 0 100 08:20:00 0 0 0 100 08:40:00 0 0 0 100 09:00:00 0 0 0 100 09:20:00 0 0 0 100 09:40:00 0 0 0 100 10:00:00 0 0 0 100 10:20:00 0 0 0 100 10:40:01 0 0 0 100 11:00:00 5 2 10 82 Average 0 0 0 100 |
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