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PM54351: JZOS SEQUENTIAL DATASET I/O PERFORMANCE IMPROVEMENT

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APAR status

  • Closed as program error.

Error description

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

Local fix

  • 



Problem summary


    

  • z/OS Java uses the IBM z/OS C library for I/O to MVS datasets.
The performance is significantly (3-4X) worse in terms of CPU
time than native COBOL or Assembler.

    



Problem conclusion


    

  • This defect will be fixed in:
6.0.1 SR1 (z/OS 31-bit)
.
Implemented new JZOS APIs in the form of two public classes,
com.ibm.jzos.RecordReader and com.ibm.jzos.RecordWriter that
support sequential record I/O to non-VSAM MVS datasets.
Sequential dataset I/O performance from Java should be on par
with COBOL and/or Assembler.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PM54351
    • 

  • Reported component name
    JAVA Z/OS 31
    • 

  • Reported component ID
    620700105
    • 

  • Reported release
    601
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2011-12-17
    • 

  • Closed date
    2011-12-17
    • 

  • Last modified date
    2011-12-17
    • 





    

  • 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
    JAVA Z/OS 31
    • 

  • Fixed component ID
    620700105
    • 



Applicable component levels


    

  • R601  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            09 August 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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