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IV01624: ALLOCATING A TLH IS SLOW AND BLOCKS OTHER THREADS ON THE SAME NU MA NODE WHEN RUNNING BALANCED GC POLICY

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APAR status

  • Closed as program error.

Error description

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

Local fix

  • 



Problem summary


    

  • The problem is observed when more than one thread on the same
NUMA node tries to allocate a TLH (for object allocation) at the
same time.  The bug causes them to slow each other down.

    



Problem conclusion


    

  • This defect will be fixed in:
6.0.1 GA FP1
.
An extraneous contention point between these threads has been
removed so multi-threaded TLH allocation should cause minimal
contention.
.
To obtain the fix:
Install build 20110211 or later

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV01624
    • 

  • Reported component name
    J9 COMMON CODE
    • 

  • Reported component ID
    620700127
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2011-06-10
    • 

  • Closed date
    2011-06-11
    • 

  • Last modified date
    2011-06-11
    • 





    

  • 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
    J9 COMMON CODE
    • 

  • Fixed component ID
    620700127
    • 



Applicable component levels


    

  • R260  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            21 February 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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