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тАО01-21-2009 07:53 PM
тАО01-21-2009 07:53 PM
Unbalanced CPU Utilization in rp7420
We have a rp7420 with single cell board and 8 CPUs.
I run sar for 12 hour and got the data.
While i checked the data I found that load on CPU 4,5,6,7 is much higher then 0,1,2,3.
Please any one can suggest why this is happening and what is the solution of the case.
For oyur referance I am attaching sar report with it.
Regards
Ankit Agrawal
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тАО01-21-2009 09:21 PM
тАО01-21-2009 09:21 PM
Re: Unbalanced CPU Utilization in rp7420
What applications/DB's are you running? This may be quite normal and nothing to worry about.
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тАО01-21-2009 09:30 PM
тАО01-21-2009 09:30 PM
Re: Unbalanced CPU Utilization in rp7420
Thanks for your reply.
We are running SAP APO on the server with oracle.
Regards
Ankit Agrawal
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тАО01-22-2009 12:48 AM
тАО01-22-2009 12:48 AM
Re: Unbalanced CPU Utilization in rp7420
None of this is showing any CPU bottlenecks. Maybe you only have around 4 processes that ever need much CPU time.
Have a look in "sar -qM 2 20" are you seeing any high numbers in the cpu runq-sz?
HTH
Duncan
I am an HPE Employee
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тАО01-22-2009 01:59 AM
тАО01-22-2009 01:59 AM
Re: Unbalanced CPU Utilization in rp7420
But is it logical that 4 r getting highly used and 4 are not.
And my application team wants that every cpu will work evenly.
Not like present scenerio.
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тАО01-22-2009 02:09 AM
тАО01-22-2009 02:09 AM
Re: Unbalanced CPU Utilization in rp7420
Seriously though.. if there's only a small number of processes doing work, then only a small number of CPUs are going to get used - when you look in glane or top do you see the same small set of processes running all the time?
Anyway you can tell your apps team that there's nothing you can do to "balance" this out (not that it matters if there's no performance hit). If they want to see more "balance" they need to look at their application parameters and see if there are ways to increase the degree of parallelism in the app (maybe starting more server instances?) I'm afraid I'm not familiar with LiveCache so can't really comment on how you'd do this.
HTH
Duncan
I am an HPE Employee
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тАО01-23-2009 07:36 AM
тАО01-23-2009 07:36 AM
Re: Unbalanced CPU Utilization in rp7420
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тАО01-23-2009 08:02 AM
тАО01-23-2009 08:02 AM
Re: Unbalanced CPU Utilization in rp7420
You need to check from the Application end
They need to design the Application to evenly distribute on the CPU available
OS will give the resource as the application demands.
I believe you should consult your application vendor, if they like to balance it on all CPU.
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тАО01-23-2009 08:16 AM
тАО01-23-2009 08:16 AM
Re: Unbalanced CPU Utilization in rp7420
>> Not like present scenerio.
And WHY would they want that?
To keep you busy? because it looks cute?
If there is a need to engage the other processors, then the OS will. Trust it for that!
Typically you want a process and its children to stay on the same CPU to increase CPU cache characteristics.
'Moving' a process has a cost, and is only done when there is a clear need.
For SAP applications, work tasks are accepted by the dispatchers and assigned to a first free work process... NOT round-robinned. If a small number of work processes can handle the work, then those can stay on the CPUs originally assigned to them and the others will not get active much. If they happened to be assigned in high-number to low-number order, then this would explain what you observe and would indicate that this is optimal.
To know exactly what is happening, one would need to know the exact OS version, teh scheduler policy selected, any pset, or mpctl setting opted for and so on.
You may want to review the Robert Sauers "HPUX tuning and performance" book before digging into this further.
hth,
Hein.