PM54351: JZOS SEQUENTIAL DATASET I/O PERFORMANCE IMPROVEMENT

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You can track all active APARs for this component.

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


More support for:

z/OS family

Software version:

601

Reference #:

PM54351

Modified date:

2011-12-17

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