PM34450: EXCESS MEMORY UTILIZATION ON THREADLOCAL IN XMLTYPEUTIL CAN CAUSE SERVANT REGION TO ABEND.

Fixes are available

APAR status

Closed as program error.

Error description

The Eclipse class
"org.eclipse.emf.ecore.xml.type.util.XMLTypeUtil"
will see excess memory utilization in a thread local variable
when XML data containing large character data sections is parsed
This can lead to threads timing out due to heavy GC to clean up
the heap consumed by these large ThreadLocal objects, and
eventually cause Servants to abend with an EC3.

Local fix

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Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server V6.1.0 and V8.0                      *
****************************************************************
* PROBLEM DESCRIPTION: Excess memory utilization will occur    *
*                      on thread local  variable               *
*                      org.eclipse.emf.ecore.xml.type.util.XML *
*                      TypeUtil$CharArrayThreadLocal when      *
*                      XML data containing large character     *
*                      data sections (CDATA sections) is       *
*                      parsed.  This can lead to threads       *
*                      timing out due to heavy garbage         *
*                      collection (GC) and eventually cause    *
*                      Servants to abend with an EC3.          *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The problem occurs because the thread local variable
org.eclipse.emf.ecore.xml.type.util.XMLTypeUtil$CharArrayThreadL
ocal performs an allocation which is proportional to the size
of the character data sections (CDATA sections) which are
processed.  Because of how threads are managed, that leads to
an effective permanent static allocation.

Problem conclusion

The problem was resolved by rewriting the XMLTypeUtil code to
remove unnecessary allocations, including the removal of the
thread local variable.

APAR PM34450 is currently targeted for inclusion in Service
Level (Fix Pack) 6.1.0.41 of WebSphere Application Server V6.1,
and and Service Level (Fix Pack) 8.0.0.1 of WebSphere
Application Server V8.0.

For WebSphere Application Server V7.0 for z/OS this APAR will
be documented as being delivered via it sysrouted APAR PM39993.

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
PM34450
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-03-09
Closed date
2011-05-24
Last modified date
2011-12-02

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

PM39993

Fix information

Fixed component name
WEBSPHERE FOR Z
Fixed component ID
5655I3500

Applicable component levels

R610 PSY UK73054
UP11/11/03 P F111

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":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
27 October 2021

Tips

PM34450: EXCESS MEMORY UTILIZATION ON THREADLOCAL IN XMLTYPEUTIL CAN CAUSE SERVANT REGION TO ABEND.

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

R610 PSY UK73054

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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