How to Check CPU Utilization (sar -u) (System Administration Guide: Advanced Administration) (2024)

How to Check CPU Utilization (sar -u)

Use the sar -u command to display CPU utilizationstatistics.

The sar command without any options is equivalentto sar -u. At any given moment, the processor is eitherbusy 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 “sittingstill” 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 processoris in user mode

%sys

Lists the percentage of time that theprocessor is in system mode

%wio

Lists the percentage of time that theprocessor is idle and waiting for I/O completion

%idle

Lists the percentage of time that theprocessor is idle and not waiting for I/O

A high %wio generally means that a disk slowdownhas occurred.

Example—Checking CPU Utilization

The following example shows output from the sar -ucommand.


$ sar -uSunOS touchstone 5.9 Generic sun4u 03/04/200300:00:00 %usr %sys %wio %idle01:00:00 0 0 0 10002:00:00 0 0 0 10003:00:00 0 0 0 10004:00:00 0 0 0 10005:00:00 0 0 0 10006:00:00 0 0 0 10007:00:00 0 0 0 10008:00:00 0 0 0 10008:20:01 0 0 0 10008:40:00 0 0 0 10009:00:00 0 0 0 10009:20:01 6 1 1 9109:40:01 15 2 0 8210:00:02 13 1 2 8310:20:03 5 2 8 8410:40:01 3 1 0 9611:00:01 1 0 1 9711:20:01 2 0 0 97Average 2 0 0 98
How to Check CPU Utilization (sar -u) (System Administration Guide: Advanced Administration) (2024)

FAQs

How do I check CPU utilization with SAR? ›

Use the sar -u command to display CPU utilization statistics. 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.

How do I check CPU utilization? ›

Using the Command Prompt: Open the Command Prompt (Start menu > type “cmd” and select it) and type “wmic cpu get loadpercentage” and press Enter.

How to calculate processor utilization? ›

Calculating CPU utilization involves a straightforward formula: CPU Utilization = (Total Time Spent on Non-Idle Tasks / Total Time) x 100. To apply this formula, follow these steps: 1. Determine the total time, which can either be the system's uptime or a specific monitoring period.

What is the command to check CPU utilization in mainframe? ›

The MCPU command displays utilization of standard (CP), Series z Application Assist (IFA), and System z® Integrated Information (zIIP) processors by address space and individual processor. LPAR-wide TCB, SRB, IFA, IFA on CP, zIIP, zIIP on CP, and enclave utilization is also displayed.

How do I check CPU utilization checkpoint? ›

Monitoring CPU Resources
  1. Go to the context of Virtual System. Acronym: VS. In the Expert mode: vsenv. In Gaia Clish. ...
  2. Run the CPView: cpview. See cpview.
  3. From the top, click: Advanced > VSX > VSs > Physical-Resources. Notes: This tab shows the CPU consumption by Virtual Systems and by Virtual Routers.

How do I check CPU and memory utilization on a server? ›

Checking Host Memory or CPU Usage
  1. Start the task manager. Choose Start > Run. The Run dialog box is displayed. Enter taskmgr and click OK. The Windows Task Manager window is displayed.
  2. Click the Performance tab. View the memory and CPU usage of the host. Figure 4-3 Memory and CPU usage of a host.
Nov 26, 2021

What is CPU utilization and how is it measured? ›

CPU utilization represents the amount of work a CPU handles to process resources or manage an operating system's tasks. This metric is used to determine system performance by estimating the average CPU usage over a certain period of time.

What is the CPU utilization? ›

CPU utilization refers to a computer's usage of processing resources, or the amount of work handled by a CPU. Actual CPU utilization varies depending on the amount and type of managed computing tasks.

How to calculate utilization? ›

Calculating the utilization rate consists of dividing an employee's total billable hours by the total available hours. In order to express the rate in percentage form, the resulting figure should be multiplied by 100.

How to check CPU utilization in Splunk? ›

To view CPU usage for a specific server role, select the server role from the Role menu.
  1. Snapshot overview. ...
  2. CPU Usage by Instance. ...
  3. CPU Usage by Primary Server Role over Splunk Process Type. ...
  4. Deployment-wide Median CPU Usage. ...
  5. Median CPU Usage. ...
  6. Median CPU Usage by Process Class. ...
  7. Median CPU usage of Searches.
Mar 19, 2022

How to check memory utilization using SAR? ›

Checking Unused Memory

You can use the sar -r command to report the number of memory pages and swap-file disk blocks that are currently unused. The output from the –r option is as follows: freemem. The average number of memory pages that are available to user processes over the intervals sampled by the command.

How to check swap usage using SAR command? ›

We can run:
  1. # free -g. ...
  2. #sar -W. ...
  3. This command will report swap space utilization statistics by giving us a look at: ...
  4. Amount of free swap space in kilobytes. ...
  5. Amount of used swap space in kilobytes. ...
  6. Percentage of used swap space. ...
  7. Amount of cached swap memory in kilobytes.

How to check overall CPU utilization in Linux? ›

  1. How to Check CPU Usage from Linux Command Line. top Command to View Linux CPU Load. mpstat Command to Display CPU Activity. sar Command to Show CPU Utilization. iostat Command for Average Usage.
  2. Other Options to Monitor CPU Performance. Nmon Monitoring Tool. Graphical Utility Option.
Mar 6, 2024

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