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Old 03-17-2008, 05:17 AM   #1
Registered: Aug 2007
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Unhappy cpu usage

Good Morning

I have a machine with 2X3.2 GHz Dual Core processors which is installed with Redhat enterprise Linux 4.3 vesion.

Can any one please tell me how to check which processor is taking the cpu usage.

I mean to say as it has 2 procerssor , how the cpu usage is divided in between the 2 procerssors.

please tell me the commands which i should use?

Waiting for your reply.

Old 03-17-2008, 06:59 AM   #2
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If you have a GUI, you can use ksysguard. Drop the CPU usage for CPU0 and CPU1 in the window and you see the performance of the two CPU's.

Old 03-17-2008, 09:54 AM   #3
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You can use 'top'. You just need to add the last CPU used column and you probably want to show all CPUs.

Just run 'top' and then enter the following keys: "1" "f" "j" <Enter>

See 'man top' for more details.
Old 03-17-2008, 02:47 PM   #4
Registered: Mar 2008
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Hello ,

The mpstat command display activities for each available processor, processor 0 being the first one. Global average activities among all processors are also reported.

# mpstat -P ALL.

Also, the CPU utilisation can be checked with 'sar' command.

Fedora Development

Last edited by prad77; 04-17-2008 at 04:08 AM.
Old 03-17-2008, 03:12 PM   #5
Registered: Mar 2006
Location: Ohio, USA
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Like prad77 said, SAR will also give you the info you are after.
I use top for real time (what are my CPS's doing right now.
And Sar for historical (how did my CPU's perform over the past day).

Sar by default reports in 10 minute increments. This is a snapshot taken every 10 minutes (not the 10 minute average).

If you type sar | more
it should show your stats for the current day.
You should also have files in /var/log/sa

the sa07 .... are binaries which you can run sar against to get specifc stats (sar has lots of possibilities).

The sar07 is an ascii file generated at the end of each day. sar07 would be the data for march 7th. It is like doing sar -EVERYTHING.
If you man sar you will get the jest of all the options available.

I only keep 10 days worth of this data, but you can keep more if you prefer.

Sustained high CPU average can be bad, but be sure to also keep an eye on load average. It is a better indicator of system load.
CPU avg of 90% for an hour with a load average of >2 is fine.

CPU avg of 90% with a load average of 15 would be a bad thing. This is indicative of 15 processes waiting in line for service by one of the CPU's. Anything less than 2 is usually okay (Rule of thumb).
Old 03-18-2008, 01:57 AM   #6
Registered: Aug 2007
Posts: 134

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Thumbs up

Thank you very much for all your replies...

All the above commands helped me a lot...

Thanks and regards


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