PM33541: TWSZ E2E SERVER STC CONSUMES HIGH CPU WHEN TRANSLATOR CALLS LE SERVICE FUNCTION W_GETPSENT() FUNCTION

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The following problem occurs when running TWS E2E on z/OS 1.11
  or higher. zOS111 zOS111+
  .
  A HIGH CPU consumption by TWSz E2E server STC is caused
  by a call to the w_getpsent system  function  which provides
  data describing the status of a  process. This data includes,
  but is not limited to, running time,  user IDs (UIDs), groups
  IDs (GIDS), and invocation parameters.
  .
  In the case where the system is already heavily loaded (running
  at or near 100% of capacity), this problem will appear as a
  slow-down of INPUT TRANSLATOR processing.  There will be a long
  delay between the time an E2E job completes on the FTA and
  reports its ending status back to the mainframe (as shown in
  the USS TWSMERGE.log) and when the operation's status is
  updated in the CURRENT PLAN.  This delay occurs because the
  INPUT translator needs more CPU cycles, but there are none to
  be had.
  .
  Changes will be implemented in the TWSz routine
  calling the w_getpsent function for code optimization .
  The TWSz change team will introduce a control on the call of
  this function avoiding all the accesses not really needed.
  .
  While this APAR addresses the symptoms of the problem, the
  real correction is made in USS and LE (Language Environment)
  APARs PM44192 and OA37105.  TWSz E2E users should apply the
  fixing PTFs for all three of these APARS.
  .
  KEYWORDS FOR SEARCHABILITY:
  ZOS ZOS11 ZOSV1R11 Z/OSV1R11 R11 Z/OS ZOS111
  RELEASE11 RELEASE111 ZOSR11 ZOSR111 ZOS111T/K
  ZOS12 ZOSV1R12 Z/OSV1R12 R12 ZOS112 ZOS113
  RELEASE12 RELEASE112 ZOSR12 ZOSR112 ZOS112T/K
  RELEASE13 RELEASE113 ZOSR13 ZOSR113 ZOS113T/K
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All TWS for z/OS users running in            *
  *                 an End-to-End environment.                   *
  *                 FUNCTION=E2E                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: During normal E2E activities, the TWSz  *
  *                      E2E server shows HIGH CPU consumption.  *
  *                      The problem is due to a call to the     *
  *                      w_getpsent system function  which       *
  *                      provides data describing the status     *
  *                      of a process.                           *
  ****************************************************************
  * RECOMMENDATION: APPLY THE PTF FIXING THIS APAR               *
  ****************************************************************
  The TWSz E2E server shows HIGH CPU consumption, during the
  usual scheduling activity.
  The problem is due to the number of calls performed to the
  w_getpsent system function which provides data describing
  the status of a process.
  

Problem conclusion

• The number of accesses to the w_getpsent system function
  have been reduced in order to avoid these not really needed.
  303Y
  503Y
  513Y
  EQQPRLVL
  EQQTRNSL
  KEYWORDS: ZOS0201T/K ZOS0202T/K
  

Temporary fix

Comments

APAR Information

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

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

  UK66933 UK66934 UK66935

Modules/Macros

• EQQPRLVL EQQTRNSL
  

Fix information

• Fixed component name

  TIV WRKLD SCHD

• Fixed component ID

  5697WSZ01

Applicable component levels

• R303 PSY UK66933

     UP11/09/10 P F109 Ž

• R503 PSY UK66934

     UP11/09/10 P F109 Ž

• R513 PSY UK66935

     UP11/09/10 P F109 Ž

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.