We can see from the output that the “all” column shows the total amount of CPU time that has been used. The 5 indicates that it should display every 5 seconds. The –u option tells it to display CPU usage. Use the following command to direct sar to monitor CPU usage at set intervals: sar –u 5 It’s not limited strictly to CPU usage, but you can use the -u option to track CPU performance. The sar tool is a utility for managing system resources. In general, we need to check which column plays a big part in CPU usage.Ĭheck CPU usage with sar Command in Linux If you see a higher number in this field, try reducing the number of virtual machines from the host. The hypervisor assigned these CPU cycles to another virtual machine. hi/si: Time spent in hardware interrupts or software interrupts.Understanding CPU usage in Linux – hi si st Try improving IO performance or reducing IO at application level. A higher value here means your CPU is spending too much time handling IO operations. id: Indicates the time spent in idle mode, where the CPU is doing nothing.ni: Time spent with user space processes that are assigned with execution priority (nice value).A higher number here can indicate too many processes, and the CPU is spending more time process scheduling. This reflects the CPU consumption by your application. us: Time spent in running user space processes.
Understanding CPU Usage in Linux – us sy ni id wa -d : Delay between updates (in seconds).Here are some other useful options for the top command: This can be helpful for identifying which processes are using the most CPU and determining if there is anything that can be done to reduce the load. It gives you a quick overview of how much CPU each process is using. The top command is a great tool to monitor CPU usage in Linux. To exit the top command, press the q key. You will see the CPU usage, memory usage, load average, and a list of the processes that are currently running. Simply type “top” at the command prompt and press enter.
The best way to check cpu usage in Linux is using top command.
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