PM82434: APPLYING INPUT SMOOTHING TO WORK FACTOR (WF) CALCULATION TO MITI GATE TRANSIENT SPIKES OF CPU UTILIZATION AND THROUPUTS

8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2

APAR status

• Closed as program error.

Error description

• Some transient spikes of CPU utilization and throuputs
  causes the Work Factor (WF) to stay high for
  prolonged time which causes unnecessary requests
  queuing.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of WebSphere Extended Deployment  *
  *                  Vesion 6.1.0.0 - 6.1.1.5, WebSphere Virtual *
  *                  Enterprise 7.0.0.0 - 7.0.0.2, and           *
  *                  WebSphere Application Server 8.5            *
  ****************************************************************
  * PROBLEM DESCRIPTION: Apply input smoothing to work factor    *
  *                      calculation to resolve the transient    *
  *                      spikes of CPU utilization and           *
  *                      throughputs.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Transient spikes of CPU utilization and throughputs cause
  the work factor to stay high for a long period of time. This
  behavior causes unnecessary requests queuing.
  

Problem conclusion

• The code was updated to apply input smoothing, and to adjust the
  CPU utilization importance factor during the work factor
  calculation. This update ensures faster response to input
  changes.
  This fix will be included in the next available fix pack for
  WebSphere Virtual Enterprise.
  

Temporary fix

Comments

APAR Information

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

  PM73053

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

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R850 PSY

     UP