Detailed explanation of Linux mpstat command usage

1. mpstat command

1.1 Command Format

mpstat [ -A ] [ -u ] [ -V ] [ -I { SUM | CPU | SCPU | ALL } ] [ -P { cpu [,...] | ON | ALL } ] [ interval [ count ] ]

OPTIONS:
-A: equivalent to -u -I ALL -P ALL
-I: You can specify four parameters: SUM CPU SCPU ALL. SUM indicates the total number of interrupts for each processor, CPU indicates the number of interrupts per second for each core, and SCPU indicates the number of soft interrupts per second for each core. This is supported only after kernel versions 2.6.31.
-P: The CPU number to be counted, usually ALL
-u: Output column information
-V: View tool version number

2. Use

2.1 Output all CPU usage every 1s

$ mpstat -P ALL 1
Linux 3.10.0-693.el7.x86_64 (zhanghao) February 26, 2019_x86_64_ (2 CPUs)

12:42:03 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
12:42:04 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:04 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:041 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00

12:42:04 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
12:42:05all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:05 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:051 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00

12:42:05 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
12:42:06all 0.00 0.00 0.00 0.50 0.00 0.00 0.00 0.00 0.00 99.50
12:42:06 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:061 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00

12:42:06 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
12:42:07 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:07 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:071 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00

12:42:07 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
12:42:08 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:08 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
12:42:081 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00

Field Analysis:
CPU: process id of each CPU
%usr: CPU utilization in user mode
%nice: CPU usage for users with nice priority
%sys: Displays the percentage of CPU utilization that occurred while executing in kernel mode. This does not include the time spent maintaining hardware and software outages.
%iowait: Displays the percentage of time the CPU or CPU is idle when the system has outstanding disk I/O requests
%irq: The percentage of time the system spends servicing hard interrupts
%soft: The percentage of time the system spends servicing soft interrupt overhead
%steal: Displays the percentage of time a virtual CPU or CPUs spent waiting while the hypervisor was servicing another virtual processor.
%guest: CPU time spent processing virtual processes
%idel: CPU idle percentage

2.2 Viewing soft interrupt statistics

$ mpstat -I SCPU 1
Linux 3.10.0-693.el7.x86_64 (zhanghao) February 26, 2019_x86_64_ (2 CPUs)

15:23:07 CPU HI/s TIMER/s NET_TX/s NET_RX/s BLOCK/s BLOCK_IOPOLL/s TASKLET/s SCHED/s HRTIMER/s RCU/s
15:23:08 0 0.00 5.00 0.00 0.00 0.00 0.00 0.00 2.00 0.00 4.00
15:23:081 0.00 28.00 0.00 5.00 0.00 0.00 0.00 24.00 0.00 3.00
15:23:09 0 0.00 6.00 0.00 0.00 2.00 0.00 0.00 3.00 0.00 5.00
15:23:091 0.00 26.00 0.00 70.00 0.00 0.00 0.00 24.00 0.00 2.00
15:23:10 0 0.00 16.00 0.00 0.00 0.00 0.00 0.00 12.00 0.00 3.00
15:23:10 1 0.00 13.00 0.00 6.00 0.00 0.00 0.00 13.00 0.00 1.00
15:23:11 0 0.00 18.00 0.00 0.00 2.00 0.00 0.00 14.00 0.00 3.00
15:23:11 1 0.00 12.00 0.00 5.00 0.00 0.00 0.00 10.00 0.00 1.00
15:23:12 0 0.00 8.00 0.00 0.00 0.00 0.00 0.00 4.00 0.00 3.00
15:23:12 1 0.00 30.00 0.00 40.00 0.00 0.00 0.00 19.00 0.00 4.00
15:23:13 0 0.00 7.00 0.00 0.00 2.00 0.00 0.00 3.00 0.00 3.00
15:23:13 1 0.00 23.00 0.00 7.00 0.00 0.00 0.00 22.00 0.00 1.00
15:23:14 0 0.00 11.00 0.00 0.00 0.00 0.00 0.00 7.00 0.00 6.00
15:23:14 1 0.00 30.00 0.00 12.00 1.00 0.00 0.00 25.00 0.00 8.00
15 hours 23 minutes 15 seconds 0 0.00 9.00 0.00 0.00 2.00 0.00 0.00 6.00 0.00 6.00
15:23:15 1 0.00 31.00 0.00 7.00 0.00 0.00 0.00 24.00 0.00 5.00
15:23:16 0 0.00 8.00 0.00 0.00 0.00 0.00 0.00 4.00 0.00 6.00
15:23:161 0.00 25.00 0.00 6.00 0.00 0.00 0.00 22.00 0.00 3.00
15:23:17 0 0.00 10.00 0.00 0.00 2.00 0.00 0.00 6.00 0.00 3.00
15:23:17 1 0.00 24.00 0.00 7.00 0.00 0.00 0.00 23.00 0.00 1.00

2.3 Output once every 2 seconds, output 3 times

$ mpstat 2 3
Linux 3.10.0-693.el7.x86_64 (zhanghao) February 27, 2019_x86_64_ (2 CPUs)

02:13:29 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
02:13:31 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
02:13:33 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
02:13:35all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
Average time: all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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