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PM36288: AVERAGE CPU TIME IN 120.X RECORDS IS NOT COMPUTED CORRECTLY

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APAR status

  • Closed as program error.

Error description

  • The average CPU time computed in the SMF 120.x records was
computed as type long but, using divison by an int.  This causes
a loss of percision which can be significant.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:  All users of WebSphere Application Server   *
*                  V7.0                                        *
****************************************************************
* PROBLEM DESCRIPTION: Average CPU time in SMF 120 subtype 6   *
*                      and SMF 120 subtype 8 interval records  *
*                      are not accurate.                       *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Average CPU time (SM120JMQ) in SMF 120 subtype 6 interval
records is not accurate. Average CPU time (SM120WJ4) in SMF 120
subtype 8 interval records is not accurate.
SM120JMQ and SM120WJ4 are not accurate because the code is
keeping a running average using integer addition and division.
Losing the remainder each time the running average is
recalculated causes the average CPU time to be inaccurate.

    



Problem conclusion


    

  • Changed the code to keep the total cpu time and divide once
when the record is written.

APAR PM36288 is currently targeted for inclusion in Service
Level (Fix Pack) 7.0.0.19 of WebSphere Application Server V7.0.

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PM36288
    • 

  • Reported component name
    WEBSPHERE FOR Z
    • 

  • Reported component ID
    5655I3500
    • 

  • Reported release
    700
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2011-04-05
    • 

  • Closed date
    2011-06-14
    • 

  • Last modified date
    2011-10-04
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    
PM35809
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    WEBSPHERE FOR Z
    • 

  • Fixed component ID
    5655I3500
    • 



Applicable component levels


    

  • R700  PSY  UK71280
       UP11/09/10  P  F109
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
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Document Information


            

            


                        

            Modified date:
            

            10 February 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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