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VM66583: PEVM66501 PERFORMANCE TOOLKIT DIVIDE EXCEPTION 21/11/22 PTF PECHANGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Performance Toolkit can encounter a divide exception during live
    guest relocation, even if VM66501 is applied.
    
    The message displayed is FCXBAS199A Divide exception at
    FCXPRC+30FC.
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of live guest relocation           *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION: APPLY PTF                                    *
    ****************************************************************
    A live guest relocation can cause PFXPRBTM to be miscalculated
    on the destination system for a virtual MP guest.  APAR VM66501
    corrected this problem for a UP guest but failed to fix it
    properly for a guest with more than one virtual processor.  The
    problem occurs because the update of PFXVTDSP is done outside
    the loop through the local cyclic list but it should be done
    inside the loop.
    
    This can cause large discontinuities in consecutive monitor
    samples between fields that report the value of PFXPRBTM.  The
    monitor records that can be affected are domain 0 record 2 and
    domain 5 record 22.  The large changes in these fields can cause
    performance monitoring products and tools like Performance
    Toolkit to abend when doing calculations involving those fields.
    

Problem conclusion

  • The update of PFXVTDSP has been moved inside the loop that is
    updating VMDVTIME so that the proper value of VMDRLVTM is placed
    into PFXVTDSP each time through the loop.
    

Temporary fix

  • FOR RELEASE VM/ESACP/ESAR710 :
    PREREQ: VM66501
    CO-REQ: NONE
    IF-REQ: NONE
    FOR RELEASE VM/ESA CP/ESA R720 :
    PREREQ: VM66501
    CO-REQ: NONE
    IF-REQ: NONE
    

Comments

APAR Information

  • APAR number

    VM66583

  • Reported component name

    VM CP CP

  • Reported component ID

    568411202

  • Reported release

    720

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-11-19

  • Closed date

    2021-12-16

  • Last modified date

    2022-12-13

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

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

    UM35924 UM35925

Modules/Macros

  • HCPRLG
    

Fix information

  • Fixed component name

    VM CP CP

  • Fixed component ID

    568411202

Applicable component levels

  • R710 PSY UM35924

       UP22/12/13 P 2201 {

  • R720 PSY UM35925

       UP21/12/29 P 2201 {

Fix is available

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Document Information

Modified date:
13 December 2022