PK84753: PERFORMANCE PROBLEM WITH TOO MANY NATIVE CHANNEL FRAMEWORK ALARMS

Fixes are available

APAR status

Closed as program error.

Error description

The native implementation for alarms related to TCP and Local
Comm Channel Framework support, can generate a large amount
of native alarm objects.  This volume of native objects
comsumes native storage and causes significant CPU consumption
managing the related data structures.  The performance can be
significantly improved in this area by associating a set of
registered alarms to a single "interval" alarm.  Thus, cutting
down on the number of native objects needed to manage the
alarm requests.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of WebSphere Application Server*
*                  V7.0 for z/OS                               *
****************************************************************
* PROBLEM DESCRIPTION: A large volume of SnoozeAlarm objects   *
*                      in a heavily loaded WebSphere           *
*                      Application Server can cause            *
*                      performance problems and CPU            *
*                      consumption.                            *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
For each Channel Framework (CFW) timed Asynchronous SEND or
READ, a set of native objects may be created to represent the
timer.  This set of objects contribute to timer queue
processing delays and CPU consumption when processing the
associated data structures.

Problem conclusion

The native timer support for CFW SENDs and READs has been
modified to implement an interval based alarm. A set of alarms
falling within this interval will share a single instance of
an alarm.  This drastically reduces the number of native alarm
objects.

APAR PK84753 is currently targeted for inclusion in Service
Level (Fix Pack) 7.0.0.5 of WebSphere Application Server V7.0.

Please refer to URL:
//www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
for Fix Pack availability.

Temporary fix

Comments

APAR Information

APAR number
PK84753
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2009-04-15
Closed date
2009-04-20
Last modified date
2009-08-03

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

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R700 PSY UK48200
UP09/07/27 P F907

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.

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

PK84753: PERFORMANCE PROBLEM WITH TOO MANY NATIVE CHANNEL FRAMEWORK ALARMS

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

R700 PSY UK48200

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.

Document Information

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