IBM Support

IT21441: PROCESSOR SPECIFIC OPTIMIZATIONS ARE NOT USED AS EXPECTED

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as fixed if next.

Error description

  • Db2 contains processor specific optimizations. They get only
    enabled, if a suitable processor gets detected.
    While a line like this in db2diag.log can be found that
    indicates that DB2 has detected a SSE4 capable CPU:
    
    CPU: total:32 online:32 Cores per socket:8 Threading degree per
    core:2 SIMD:Y CPU Features:SSSE3,SSE4
    
    another line in db2diag.log indicates that the CPU optimizations
    are effectively not used:
    
    BLU: HW SIMD enabled: SCAN(Y), ARITH(Y), COMP(Y), CPU(1)
    
    That means only SSE2 optimizations are used.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All systems with modern CPUs.                                *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade Db2.                                                 *
    ****************************************************************
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT21441

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED FIN

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-07-14

  • Closed date

    2017-07-21

  • Last modified date

    2017-07-21

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

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

Fix information

Applicable component levels

  • RB10 PSN

       UP

  • RB10 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
21 July 2017