Date: Thu, 19 Nov 2009 09:17:57 -0600
Reply-To: CICS List <CICS-L@LISTSERV.UGA.EDU>
Sender: CICS List <CICS-L@LISTSERV.UGA.EDU>
From: "Mullen, Patrick" <Patrick.Mullen@GWL.CA>
Subject: Re: CPU Spike - CICS 3.2
In-Reply-To: <200911191400.nAJBn3i3030148@malibu.cc.uga.edu>
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My old CICS/TS v1.3 System Definition Guide lists LLACOPY as a SIT
parameter way back then, why do you say it was new in v3.2?
-----Original Message-----
From: CICS List [mailto:CICS-L@LISTSERV.UGA.EDU] On Behalf Of Judy Ellis
Sent: Thursday, November 19, 2009 8:00 AM
To: CICS-L@LISTSERV.UGA.EDU
Subject: Re: CPU Spike - CICS 3.2
On Tue, 17 Nov 2009 16:46:12 -0500, Martin, Mike
<Mike.Martin@NCSECU.ORG>
wrote:
>All,
>
>
>
>We just upgraded to CICS TS 3.2 (z/OS). One of our production online
>regions spikes the CPU for about 26 seconds. All the transactions
>appear to stop during this time. I don't see a flood of transactions
or
>a single transaction contributor. After the 26 second spike,
everything
>goes back to normal. It doesn't seem to coincide with an activity
>keypoint or statistics interval. It happened four times yesterday and
a
>few times today. Any theories/ideas are greatly appreciated! (we are
>a VSAM shop w/o DB2)
>
>
>
>Mike Martin
>
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>
Mike,
Take a look in the Performance Guide v3.2.1(SC33-0659-01) In short v3.2
introduced a new SIT parameter LLACOPY=YES|NO|NEWCOPY YES being the
default. This has been known to cause spikes. I coded LLACOPY=NO in my
SIT
parameters and have not noticed any spikes since I've installed v3.2
about
a year ago. We are are a DB2/CICS vsam shop.
thanks,
Judy Ellis
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