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VM65647: PERFORMANCE TOOLKIT- DIVIDE EXCEPTION AT FCXUSL+476

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Error message - FCXBAS199A Divide exception at FCXUSL+476 may
    occur when calculating CPU time for report FCX112 (USER).
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of Performance Toolkit.            *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION: APPLY PTF                                    *
    ****************************************************************
    The problem occurred when Performance Toolkit was
    calculating CPU time for report FCX112 (USER).
    
    In FCXUCM, when processing a D4 R5 (Define CPU) monitor
    record, the code at label REST001 clears the 'logon time'
    (UCMOLOGN)in the 'User Data Buffer' corresponding the CPU
    being defined.  Later, in the same sample interval, a D4 R3
    (User Activity Data) monitor record is processed for a newly
    defined CPU, and near label NEWUSI2A the 'logon time'
    (UCMOLOGN) is checked to see if it has a non-zero value.
    If UCMOLOGN is zero, then the code continues, assuming there
    is valid data in the 'User Data Buffer'.  If UCMOLOGN is
    non-zero, then the code assumes the device was created during
    the current sample interval and processes reset logic for a
    new session.
    
    When the initial D4 R3 record is processed, and the UCMOLOGN
    is zero, the delta CPU time for the current sample interval is
    calculated using invalid data that had not been cleared when
    the new CPU was defined.
    
    In FCXUSL, code at label LIMITCPU determines the delta CPU time
    for an interval in microseconds, then divides that result by 100
    to compute the number of 0.1 milliseconds. The divide exception
    occurred because the quotient representing the number of 0.1
    milliseconds was too large to fit in a single register.
    
    Performance Toolkit presents the error on the display as well as
    in the CONLOG and EXCPLOG.
    

Problem conclusion

  • Code at label REST001 in FCXUCM was changed to set UCMOLOGN
    to the TOD from the header of the monitor record when
    processing a D4 R5 monitor record.
    
    Code at label LIMITCPU in FCXUSL was changed to handle
    a quotient that is a double word (2 registers) in size.
    

Temporary fix

  • FOR RELEASE PERFKIT-6.4.0 :
    PREREQ: NONE
    CO-REQ: NONE
    IF-REQ: NONE
    FOR RELEASE PERFKIT-7.1.0 :
    PREREQ: NONE
    CO-REQ: NONE
    IF-REQ: NONE
    

Comments

  • ×**** PE18/12/04 FIX IN ERROR. SEE APAR VM66234  FOR DESCRIPTION
    

APAR Information

  • APAR number

    VM65647

  • Reported component name

    PERF TOOLKIT

  • Reported component ID

    568411218

  • Reported release

    640

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-06-15

  • Closed date

    2018-10-02

  • Last modified date

    2020-11-25

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

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

    UM35137 UM35190

Modules/Macros

  • FCXUCM   FCXUSL
    

Fix information

  • Fixed component name

    PERF TOOLKIT

  • Fixed component ID

    568411218

Applicable component levels

  • R640 PSY UM35137

       UP18/10/10 P 1901

  • R710 PSY UM35190

       UP18/10/10 P 1901

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
26 November 2020