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CPU usage for 5 mins

 
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# 1  
Old 04-15-2013
RedHat CPU usage for 5 mins
Hi Experts,

Please help me in find the right way to create a script for the below task.

Task - I need to create a alert script for CPU usage and I only need to alert when there is a process hold the CPU high for more than 5 mins.

Initially five mins one use the ps command five mins once like below to get the high CPU usage

Code:
ps -eo pcpu | sort -nr | head -1 | awk '{print int($1)}'


But the problem is this script will also alert the process which momentary spike and come to normal. So i am using the line below to calculate the idle CPU then the process count. Is there any better way to deal this, please help me with your ideas?

Code:
sar -u 12 20 | tail -1 | awk '{print int($8)}'

Its a red hat Linux machine
# 2  
Old 04-15-2013
Take three cpu readings, separated by five minutes sleep.

If reading is normal, set a log file (that you maintain) to zero.
If reading is high, increment the count in the log file.
If reading if high, and log file count is three, take action.

This way, you rule out a temporary spike.
# 3  
Old 04-15-2013
if i do so i will get alert after 15 min about a CPU high do any simple way to perform.

Thanks
# 4  
Old 04-15-2013
Yes, you would get an alert after 15 minutes, if that is the question.

If 15 minutes is too long, you could sleep less than five minutes. Or maybe use "load average" from uptime.
This User Gave Thanks to hanson44 For This Post:
senthil.ak
# 5  
Old 04-15-2013
what is the best way to read the CPU? you mentioned in your earlier reply we need to for three readings so shall i use like below. appriciate your comments

Code:
mpstat 5 3 | tail -1 | awk '{print int($10)}'

Code:
sar 5 3 | tail -1 | awk '{print int($8)}'

# 6  
Old 04-15-2013
I'm not sure the best way to read cpu. I normally use uptime "load average". If there is one process going constantly on a single cpu system, the load average is 1. You would need to decide how high a load to tolerate, based on the normal load you see.
Code:
$ uptime
 14:56:02 up 69 days, 15:00,  1 user,  load average: 0.08, 0.02, 0.01
$ uptime | sed "s/.*load average: *\([0-9]*\).*/\1/"
0

Code:
load=`uptime | sed "s/.*load average: *\([0-9]*\).*/\1/"`
if [ $load -gt 0 ]; then
  # figure out if load was high previous two times
  # if previously high two times, send email message and maybe exit script.
  # otherwise, record that load was high, and continue loop, to sleep a while.
else
  # record that load was normal
fi

On my linux system, sar and mpstat are not installed, but they should work fine too, since they measure cpu usage. It would just be a matter of using sed or awk to get the right number from the sar or mpstat output.
 
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