Re: Power7 V7R1 Total Wait Analysis - Semaphore contention -- MIDRANGE-L

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Subject: Re: Power7 V7R1 Total Wait Analysis - Semaphore contention
From: Bryan Dietz <bdietz400@xxxxxxxxx>
Date: Wed, 16 Dec 2015 15:24:20 -0500
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I would start with IBM's iDoctor, specifically JobWatcher

https://www-912.ibm.com/i_dir/idoctor.nsf

--
Bryan

Steinmetz, Paul wrote on 12/16/2015 2:43 PM:

I was recently reviewing Production LPAR performance numbers.
Not really having any issues, 100% SSD with 155gb memory.
Everything running well.

But I did find something interesting that has me curious.

Total Wait Analysis.
Semaphore contention 3.825 (53.87%)
Time dispatched on a CPU 2.626 (36.97%)

I've been informed that it is not normal to see Semaphore contention.
And over half of my waits are.

Anyone ever see this?
How does one find the job(s) that are causing Semaphore contention?

http://www-01.ibm.com/support/docview.wss?uid=swg21094630

Thank You
_____
Paul Steinmetz
IBM i Systems Administrator

Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071

610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home

psteinmetz@xxxxxxxxxx
http://www.pencor.com/

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