OA44310: DSILOGMT TASK USING HIGH CPU

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DSILOGMT is looping in DSI4LCM1 that is trying to update the
  'dead zone' for CANZLOG. DSI4LCM1 has a problem determining
  what the latest active plot is.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM Automation Control for      *
  *                 z/OS V1R1 and Tivoli NetView for z/OS        *
  *                 V6R2 with PTF UA69348 (for APAR OA42063)     *
  *                 applied                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: During the periodic, automatic          *
  *                      maintenance of Canzlog, the DSILOGMT    *
  *                      task may enter a seemingly infinite     *
  *                      loop, resulting in high CPU             *
  *                      utilization.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When module DSI4LCM1, running on task DSILOGMT, is maintaining
  Canzlog and detects that a new 8-megabyte segment ("plot") is
  being written (that is, has become "active"), it attempts to
  move the "dead zone", a 4-plot border area between the most
  recent and oldest messages in Canzlog.
  To exit a loop that marks the "dead zone", the code must finish
  marking all 4 plots.  Because the compiler failed to generate
  some of the code for a routine inside the loop that updates
  the current active plot information, the loop is never exited
  (at least until the Canzlog data space has wrapped such that
  the last known active plot becomes active again, which could
  take a considerable amount of time), and high CPU utilization
  results.
  

Problem conclusion

• Part DSI4LCM1 is being changed to call, in a different fashion,
  an internal routine that determines the current active plot.
  For that call, the compiler generates the proper code, thus
  preventing the loop.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

  OA44273

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

  UA72403

Modules/Macros

• DSI4LCM1
  

Fix information

• Fixed component name

  AUTO CNTL NETV

• Fixed component ID

  5698LSA01

Applicable component levels

• R11B PSY UA72403

     UP14/03/06 P F403

Fix is available

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