Use the sar -w command to report swapping and switching activity. Use the sar -v command to report the status of the process table, inode table, file table, and shared memory record table. Lists the percentage of time that the processor is idle and not waiting for I/O.Ī high %wio value generally means that a disk slowdown has occurred How to Check System Table Status ( sar -v) Lists the percentage of time that the processor is idle and waiting for I/O completion. Lists the percentage of time that the processor is in system mode. Lists the percentage of time that the processor is in user mode. The following list describes output from the -u option: %usr When idle, the processor is either waiting for I/O completion or “sitting still” with no work to do. When busy, the processor is in either user mode or system mode. At any given moment, the processor is either busy or idle.

The sar command without any options is equivalent to the sar -u command. Use the sar -u command to display CPU utilization statistics. The number of 512-byte disk blocks that are available for page swapping. The average number of memory pages that are available to user processes over the intervals sampled by the command. The following list describes the output from the -r option: freemem Use the sar -r command to report the number of memory pages and swap-file disk blocks that are currently unused. Swap queue of processes for the sar command. The percentage of time that the dispatch queues are occupied. Consistently higher values mean that the system might be CPU-bound.

Typically, this value should be less than 2. The number of kernel threads in memory that are waiting for a CPU to run. The following list describes the output from the -q option. $ sar -q 00:00:00 runq-sz %runocc swpq-sz %swpocc The percentage of time that the queue is occupied. The Average queue length while the queue is occupied. Use the sar -q command to report the following information:

Sar command to check cpu utilization