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Total cpu usage in percent(%)


 
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# 1  
Old 11-26-2010
Total cpu usage in percent(%)

How to determine the total percentage cpu usage of a server having 4 cpu cores(quad core)?
# 2  
Old 11-26-2010
The supplied command sar it probably what you are after. If you are after the value since last boot, just fire it off without parameters. Depending on your installation, you may get hourly or 5 minute stats, but it is averaged at the end. This is usually controlled by the running of sa1, often by the cron table of user account adm.

The columns are usually %usr %sys %wio %idle, so it's up to you to decide if you want 100-%idle or if I/O wait should be considered.

If this answers what you need, great.

If you need average at the moment, you can supply a variety of parameters. You could have
Code:
sar 1 1

... which gets the information from the last 1 second. You can stretch this by increasing the first value. You can vary it by increaing the second value to show you more samples, e.g.
Code:
sar 3 5

... will report the usage over the last 3 seconds 5 times and then an average.

There are also reports generated by sa2, again usually by the cron table of adm. Read your manaul pages about sa2 for where this file is likely to be in your implementation if you have it enabled.





I hope that this helps.

Robin
Liverpool/Blackburn
UK
This User Gave Thanks to rbatte1 For This Post:
# 3  
Old 12-09-2010
Did this deliver what you need, or can I help some more?
This User Gave Thanks to rbatte1 For This Post:
# 4  
Old 12-09-2010
Thanks...a lot...it did help me
 

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