IBM Support

IJ44106: JAVA JIT - PERFORMANCE REGRESSION WHEN CALLING VM HELPER CODE ON X86

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
.
Stack Trace: N/A
.

Local fix

  • 



Problem summary


    

  • A performance throughput regression of up to 10% was detected on
some workloads. This problem is limited to x86 and does not
impact arm, Z or power releases. The regression was caused by
enhancements to the JVM for Project Panama (Vector API).
This issue is present in the following releases:
   8    SR7 FP15   (8.0.7.15)
   8    SR7 FP16   (8.0.7.16)

    



Problem conclusion


    

  • The JVM has been updated to revert the offending changes.
.
This APAR will be fixed in the following Releases:
.
IBM SDK, Java Technology Edition
   8    SR7 FP20  (8.0.7.20)
.
Contact your IBM Product's Service Team for these Service
Refreshes and Fix Packs.
For those running stand-alone, information about the available
maintenance can be found at:
           https://www.ibm.com/support/pages/java-sdk

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ44106
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    130
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2022-11-02
    • 

  • Closed date
    2022-11-02
    • 

  • Last modified date
    2022-11-02
    • 





    

  • 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


    








      
              
                            

              

              [{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"130","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            02 November 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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