Solved

CPU utilization command

Posted on 2009-07-14
9
709 Views
Last Modified: 2012-06-27
what is the command to find average, minimum and maximum cpu utilization in percentages for linux servers.
0
Comment
Question by:mkarthik415
9 Comments
 
LVL 40

Expert Comment

by:mrjoltcola
ID: 24855193
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 %
0
 
LVL 7

Expert Comment

by:martin_2110
ID: 24855270
sar -u will give you a history. the sysstat package needs to be installed. Most distros have it.
0
 
LVL 30

Expert Comment

by:Kerem ERSOY
ID: 24855282
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.
0
 
LVL 30

Expert Comment

by:Kerem ERSOY
ID: 24855291
With UNIX systems you mainly use :

sat, mpstat, top and uptime

commands to get an information about CPU usage.

0
Enterprise Mobility and BYOD For Dummies

Like “For Dummies” books, you can read this in whatever order you choose and learn about mobility and BYOD; and how to put a competitive mobile infrastructure in place. Developed for SMBs and large enterprises alike, you will find helpful use cases, planning, and implementation.

 

Author Comment

by:mkarthik415
ID: 24855658
I want only average, minimum and maximum cpu utilization. I think we would require a script to get this.
0
 
LVL 2

Assisted Solution

by:onethreefour
onethreefour earned 100 total points
ID: 24855901
How about this...
You can call the linux 'uptime' command and 'pipe' it to 'cut' with the correct flags to give you JUST the output containing the current averages:
uptime | cut -d: -f5

Using these 'averages' you could assume the lowest value to be your minimum and highest to be your maximum... It would not be a true reading, and would only cover the last 15 minutes or so of time, but is exact measurement really your main objective?  A lot of the time it is more important to simply watch trends or have alerts when maximum or minumum threshholds are broken...  Using this method could still allow you to have triggers when there are highs or lows...

0
 
LVL 30

Expert Comment

by:Kerem ERSOY
ID: 24856069
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}'

Open in new window

0
 
LVL 40

Expert Comment

by:omarfarid
ID: 24856366
you may use top in batch mode

top -b -d1 | grep stat
0
 
LVL 30

Accepted Solution

by:
Kerem ERSOY earned 400 total points
ID: 24857840
Only sar will give you the CPU time in 10 minutes reports. Other solutions such as uptime will give you current, 5 min1tes abck and 10 minutes back CPU load but not min, max and average.

While top in batch mode will give the status of the most active process.

Here's the line what gives you need. The sample output from my system is :

Lowest=0.8 Highest=27.5 Average=4.11

If you want you can omit Labels before the numbers.
sar | grep "^[0-9]" | grep -v CPU | awk '{print $8}' | sort -rn | awk 'NR==1 {printf "Lowest=%s ", 100-$1} END {printf "Highest=%s ", 100-$1}' ; sar | tail -1 | awk '{print "Average=" 100 - $7}'

Open in new window

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you have a server on collocation with the super-fast CPU, that doesn't mean that you get it running at full power. Here is a preamble. When doing inventory of Linux servers, that I'm administering, I've found that some of them are running on l…
Introduction We as admins face situation where we need to redirect websites to another. This may be required as a part of an upgrade keeping the old URL but website should be served from new URL. This document would brief you on different ways ca…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…
Connecting to an Amazon Linux EC2 Instance from Windows Using PuTTY.

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now