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APA overhead


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John Poulakos

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Joined: 13 Jun 2012
Posts: 180
Location: United States

PostPosted: Thu Apr 03, 2014 7:15 pm
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I'm seeing serious APA overhead for an intense DB2 application and I don't know if this is normal, or if there is anything that can be done to reduce it. Here's a sample:


Code:
 Name      Description        Percent of CPU Time * 10.00% 
                                  *....1....2....3....4....5
 DSNIDM    Data Manager      27.93 **************           
 CAZ00681  APA DB2 Services  20.71 **********               
 DSNXGRDS  Relational Data    8.50 ****                     
           System                                           
 1BCFDxxx  Unresolved         5.34 ***                     
           Address                                         
           Application        4.65 **                       
           Program                                         
 CAZ00670  APA DB2 Services   4.19 **                       
 DSNGD001  Data Manager       3.99 **                       
 1B736xxx  Unresolved         3.96 **

CAZ00681 and CAZ00670 are the APA modules. There were 1m opens, 2m fetches and 1m closes done in this sample.
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AlanMac

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Joined: 04 Dec 2018
Posts: 1
Location: UK

PostPosted: Fri Nov 08, 2019 2:42 am
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Switch off the plus collectors, and I suspect your overhead is also in the unresolved locations too should you delve in to your CSA
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vasanthz

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Joined: 28 Aug 2007
Posts: 1689
Location: Tiruppur, India

PostPosted: Fri Nov 08, 2019 9:02 pm
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Turning off the plus collectors should be the heavy hitter, Also I think we should pay attention to the "Measurement Significance" value in S01 report which says how good of a measurement it is based on the sampling rate and time.
Also the "S01: Measurement profile" has the APAs overhead CPU time in seconds. With that we could determine if overhead is large or a very small value whose % value is exaggerated in comparison.

Also this thread is over 4 years old :-)
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