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IV75184: PERF: JAVA 8 REDISCOVERY PERFORMANCE DEGRADATIONS DUE TO IDIOMRE COGNITION

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APAR status

  • Closed as program error.

Error description

  • Error Message: Java 8 runs slower compared to Java 7.1
.
Stack Trace: N/A
.
N/A

Local fix

  • 



Problem summary


    

  • Redundant induction variable elimination optimization is
dependent on induction variable analysis. For a certain hot
loop, IV analysis failed to return a primary induction variable.
Idiom Recognition's pattern match failed as a result and we
produced sub-optimal code.

    



Problem conclusion


    

  • JIT has been modified to fix the above issue. The problem was
introduced in Java 8 GA and has been fixed in Java 8 SR2.
.
This APAR will be fixed in the following Java Releases:
   8    SR1 FP10  (8.0.1.10)
.
Contact your IBM Product's Service Team for these Service
Refreshes and Fix Packs.
For those running stand-alone, information about the available
Service Refreshes and Fix Packs can be found at:
           https://www.ibm.com/developerworks/java/jdk/

    



Temporary fix


    

  • N/A

    



Comments


    

  • 



APAR Information




    

  • APAR number
    IV75184
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    130
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2015-07-15
    • 

  • Closed date
    2015-07-15
    • 

  • Last modified date
    2015-07-15
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R130  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            15 July 2015
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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