/Proc metric data to obtain CPU Information

Refer:Http://www.icsmile.com/2013/07/02/monitor_from_proc_cpu_mem.html

CPU data is mainly obtained from "/proc/stat". We can calculate the CPU usage.
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What does the above mean?

CPU and CPU 0, CPU1, CPU2, CPU3, CPU4, CPU5 each parameter meaning in each line

Parameters

Explanation

User Nice System Idle Iowait Irq Softirq Steal Guest

From the system start to the current time point, the CPU time unit of the user State is jiffies. The nice value is not included in the process. 1 jiffies = 0.01 seconds CPU time units occupied by processes with a negative nice value from system start to current time: jiffies) From system startup to current time, the core time unit is jiffies) From system startup to current time, except hard disk IO wait time, other wait time units: jiffies) From system startup to current time, hard disk IO wait time unit: jiffies ), From system startup to current time, the unit of hard interruption time is jiffies) From system startup to current time, Soft Interrupt time unit: jiffies)

The "intr" line shows the number of interruptions. The first line is the number of all interruptions that have occurred since the system was started; then each number corresponds to the number of times a specific interruption has occurred since the system was started.

"Ctxt" indicates the number of times the CPU context has been exchanged since the system was started.

"Btime" indicates the time (in seconds) that has elapsed since the system was started.

The number of tasks created since the system started "processes (total_forks.

"Procs_running": number of tasks in the current queue.

"Procs_blocked": Number of blocked tasks.

Obtain two samples
Roughly calculate the CPU usage
Run the following command to obtain the result twice and then calculate it:

cat  /proc/stat|grep ^cpu && echo '##' &&sleep 1 &&cat  /proc/stat|grep ^cpu

Output
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The total cpu usage is calculated.

# Cpu 488 0 3567 8501952 4776 303 0 0 0 # cpu 924 0 488 3568 8502646 4788 0 0 # formula total = user + nice + system + idle + iowait + irq + softirq + steal + guest

total1=8512010total2=8512717

# Cpu idle book calculation formula cpu_idle = (idle2-idle1)/(total2-total1) * 100 # substituted (8502646-8501952)/8512717-8512010) * 100 = 98.1612446959

# Formula for Calculating CPU usage cpu_usage = 100-cpu_idle # cpu_usage = 100-98.1612446959 = 1.8387553041

Computing is complete now

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