CPU utilization command

top is one option

You can use vmstat to log historical.

vmstat 5

Will print a line every 5 seconds with CPU and other stats.


The uptime command will show load avg for last 1, 5 and 15 minutes, but does not show CPU %

sar -u will give you a history. the sysstat package needs to be installed. Most distros have it.

Hi,

If you might like to insall the package called systat and you can use these commands :

sar
mpstat

The usage is :

sar -u 5 10

will get statistics for 5 seconds and repeat 10 times.

mpstat 5 10

Will do this for 10 times with 5 seconds delay.

sar

Sample sar output is like this:
# sar
Linux 2.6.9-78.0.22.EL (host.domain.com.tr)        07/15/2009

12:00:01 AM       CPU     %user     %nice   %system   %iowait     %idle
12:10:01 AM       all      2.74      0.00      0.52      0.36     96.38
12:20:01 AM       all      0.99      0.00      0.32      0.06     98.62
12:30:01 AM       all      2.37      0.00      0.50      0.28     96.84
12:40:01 AM       all      1.03      0.00      0.33      0.08     98.56
12:50:01 AM       all      1.05      0.00      0.37      0.06     98.51
01:00:01 AM       all      1.23      0.00      0.37      0.12     98.27
01:10:01 AM       all      0.70      0.00      0.31      0.05     98.94
01:20:01 AM       all      0.78      0.00      0.29      0.13     98.80
01:30:01 AM       all      2.58      0.00      0.35      0.20     96.87
01:40:01 AM       all      0.65      0.00      0.24      0.03     99.08
01:50:01 AM       all      1.41      0.00      0.35      0.13     98.10
02:00:01 AM       all      0.95      0.00      0.29      0.12     98.63
02:10:01 AM       all      0.57      0.00      0.20      0.03     99.20
02:20:01 AM       all      1.13      0.00      0.33      0.06     98.47
02:30:01 AM       all      1.60      0.00      0.31      0.13     97.96
02:40:01 AM       all      1.11      0.00      0.33      0.14     98.42
02:50:01 AM       all      1.02      0.00      0.33      0.07     98.58
03:00:01 AM       all      1.95      0.00      1.13      2.16     94.75
03:10:01 AM       all      2.11      0.00      0.95      5.32     91.62
Average:          all      1.37      0.00      0.41      0.50     97.72
and

mpstat

Sample mpstat output is:

# mpstat
Linux 2.6.9-78.0.22.EL (host.domain.com.tr)        07/15/2009

03:23:38 AM  CPU   %user   %nice %system %iowait    %irq   %soft   %idle    intr/s
03:23:38 AM  all    1.64    0.00    0.32    0.17    0.00    0.00   97.86   1018.63

Will collect information and when executed in their own they will display the historic data of CPU utilization. You might as well use top if you want interactive display.


the command

w

will display you momentarily CPU usage like this:

# w
 03:21:56 up 12 days, 11:58,  4 users,  load average: 0.02, 0.02, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     :0       -                02Jul09 ?xdm?   1:55m  1.66s /usr/bin/gnome-session
root     pts/1    :0.0             02Jul09 12days  0.07s  0.07s bash
root     pts/2    host.dom.com  23:35    0.00s  0.28s  0.00s w
root     pts/3    host.dom.com  03:01   18:21   0.04s  0.04s -bash

Uptime is smilar and itwill only show the first line of what w displays.

Cheers,
K.

With UNIX systems you mainly use :

sat, mpstat, top and uptime

commands to get an information about CPU usage.

I want only average, minimum and maximum cpu utilization. I think we would require a script to get this.

then you'll need sar. since it keeps statistics in 10 minutes periods. This command below will show it. You'll need to install the package called sysstat first. On my system the sample output is :

Highest= 3.62
Lowest=1.38
Average=2.39

# sar | grep "^[0-9]" | grep -v CPU | awk 'NR==1 {print "Highest= " 100 -$8} END {print "Lowest=" 100 - $8}' ; sar | tail -1 | awk '{print "Average=" 100 - $7}'

Select allOpen in new window

you may use top in batch mode

top -b -d1 | grep stat