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PM62709: EXCESSIVE SRBS WERE SCHEDULED

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APAR status

  • Closed as program error.

Error description

  • IRLM request handler module incorrectly issued SCHEDULE macro
even another SRB already scheduled. This causes so many SRBs are
schedlued and it cause performance degradation in very special
case.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED: All IRLM220 (HIR2220) users and IRLM230      *
*                 (HIR2230) users.                             *
****************************************************************
* PROBLEM DESCRIPTION: IRLM abended U2027 in module DXRRL200.  *
*                      Prior to the abend, message DXR167E     *
*                      displayed on the console.               *
****************************************************************
* RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
****************************************************************
   For every queued request, IRLM request handler builds and
schedules an SRB to process the request.  In a heavy workload
system, this excessive SRB scheduling exhausts the system
resources, causing delay in processing requests and degrading
the system performance.

    



Problem conclusion


    

  • GEN:
KEYWORDS:

*** END IMS KEYWORDS ***
   Code in the request handler is modified to schedule an
SRB only when there is no SRB scheduled and none running.

    



Temporary fix


    

  • *********
* HIPER *
*********

    



Comments


    

  • 



APAR Information




    

  • APAR number
    PM62709
    • 

  • Reported component name
    IRLM V2
    • 

  • Reported component ID
    569516401
    • 

  • Reported release
    220
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    YesHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2012-04-17
    • 

  • Closed date
    2012-07-26
    • 

  • Last modified date
    2012-09-05
    • 





    

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

    • 

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

    
UK80552 UK80551
    

    • 



Modules/Macros


    

  •    DXRRL200 DXRRS200

    



Fix information


    

  • Fixed component name
    IRLM V2
    • 

  • Fixed component ID
    569516401
    • 



Applicable component levels


    

  • R220  PSY  UK80551
       UP12/08/10  P  F208
    • 

  • R230  PSY  UK80552
       UP12/08/10  P  F208
    • 



Fix is available


    

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              [{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEPHL","label":"IRLM"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"220","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            05 September 2012
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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