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Context Switches and System Calls in HP-UX [message #547585]

Wed, 14 March 2012 22:53

orarule
Messages: 11
Registered: March 2012

Junior Member

Hi All,

Is there a threshold for context switches and/or system calls in HP-UX.

Theres 4 Intel Itanium 2 9100 1.59 GHz, 24 MB (dual-core) on this host.

Yesterday I saw a high of 1.363.312.955 system calls per hour and 49.730.716 context switches per hour.

I dont know what the peak/sec was but his would average approximately 380.000 system calls/sec and 14.000 context switches/sec.

The CPU utilization was at max 80% used, but I'm concerned there is a bottleneck due to the high amount of context switches and system calls.

Thanks!

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Re: Context Switches and System Calls in HP-UX [message #547590 is a reply to message #547585]

Wed, 14 March 2012 23:22

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

>but I'm concerned there is a bottleneck due to the high amount of context switches and system calls.
Bottleneck where exactly?

It appears that you suffer from Compulsive Tuning Disorder.
What values would relieve your anxiety?
What reproducible benchmark value do you have to support you anxiety level?

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Re: Context Switches and System Calls in HP-UX [message #547595 is a reply to message #547590]

Wed, 14 March 2012 23:25

orarule
Messages: 11
Registered: March 2012

Junior Member

This is for an SAP system. For many of the user's steps during the peak period, we are seeing PROCESSING TIME much greater than CPU time. This doesnt garentee a CPU bottleneck but is indicates a potential for one.

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Re: Context Switches and System Calls in HP-UX [message #547597 is a reply to message #547595]

Wed, 14 March 2012 23:38

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

>For many of the user's steps during the peak period, we are seeing PROCESSING TIME much greater than CPU time.
post SQL & results so we can see what you report

what is CPU queue depth?

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Re: Context Switches and System Calls in HP-UX [message #547613 is a reply to message #547585]

Thu, 15 March 2012 01:56

Michel Cadot
Messages: 68731
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

This question bears no real connection with Oracle.
Please find a more appropriate forum.
The topic is locked.
If I'm wrong, please, PM me (or report this message to a moderator, explain why you think it should be unlocked and it might be done).

Regards
Michel

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