What is Sy in top?

What is Sy in top?

sy – system cpu time (or) % CPU time spent in kernel space. ni – user nice cpu time (or) % CPU time spent on low priority processes. id – idle cpu time (or) % CPU time spent idle.

What is US and Sy in top command?

us – user cpu time (or) % CPU time spent in user space. sy – system cpu time (or) % CPU time spent in kernel space.

What does WA mean in top command?

Waiting for I/O
wa (Waiting for I/O) from top command is big.

What is ID in CPU?

In the x86 architecture, the CPUID instruction (identified by a CPUID opcode) is a processor supplementary instruction (its name derived from CPU IDentification) allowing software to discover details of the processor. It was introduced by Intel in 1993 with the launch of the Pentium and SL-enhanced 486 processors.

What is Softirq?

A very important softirq is the timer softirq ( include/linux/timer. h ): you can register to have it call functions for you in a given length of time. Softirqs are often a pain to deal with, since the same softirq will run simultaneously on more than one CPU. For this reason, tasklets ( include/linux/interrupt.

What is WA in Linux top?

Follow RSS feed Like. CPU consumption in Unix/Linux operating systems are studied using 8 different metrics: User CPU time, System CPU time, nice CPU time, Idle CPU time, Waiting CPU time, Hardware Interrupt CPU time, Software Interrupt CPU time, Stolen CPU time.

How do I identify my CPU?

Windows* on your keyboard and start typing System, choose System Information which will show Processor information with the name, number, and speed of the processor.

What is difference between Softirq and Tasklet?

Tasklets differ from softirqs because a tasklet is always serialized with respect to itself; in other words, a tasklet cannot be executed by two CPUs at the same time….Softirqs, Tasklets, and Bottom Halves.

Deferrable function Dynamicallocation Concurrency
Softirq No Softirqs of the same type can run concurrently on several CPUs.

What is Softirq time?

How do you check Iotop?

Some important iotop usage and keyboard shortcuts.

  1. Move left or right arrow key to change the sorting.
  2. Use –version option to see version number and exit.
  3. Use -h option to see information of usage.
  4. Use -r option to reverse the sorting order.
  5. Use -o option to check processes or thread.