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IV83312: PERFORMANCE DEGRADATION ON PROGRAMS THAT MAKE PMAPI CALLS. APPLIES TO AIX 7100-03

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APAR status

  • Closed as program error.

Error description

  • PMAPI calls cause a huge performance hit after upgrading
to AIX 7.1TL3 from 71TL1. 71TL2 probably has the same
issue. The performance hit exasperates as the number of
threads increase.

Num ofthreads|   2    |    4    |    8    |   16    |  32
---------------------------------------------------------
-------
V7.1TL01SP03 |1m15.01s| 1m33.09s| 1m45.35s| 1m56.71s|
2m24.22s
---------------------------------------------------------
-------
V7.1TL03SP03 |1m39.92s| 2m14.71s| 6m3.17s
|13m45.15s|29m26.32s
---------------------------------------------------------
-------

Local fix

  • N/A

Problem summary

  • PERFORMANCE DEGRADATION ON PROGRAMS THAT MAKE PMAPI CALLS.

Problem conclusion

  • Added the logic for mythread* pmapi calls to get the context
without locks.
Cache Aligned the context structure.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV83312
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2016-04-04
    • 

  • Closed date
    2016-04-22
    • 

  • Last modified date
    2017-01-20
    • 





    

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

    • 

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

    
IV84110 IV84115 IV88172
    

    • 



Fix information


    

  • Fixed component name
    AIX V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U872426
       UP17/01/19  I  1000
    • 








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SG11R"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            19 April 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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