A fix is available
APAR status
Closed as program error.
Error description
Queue Manager suffers an increase of WMQ storage. Dump shows high allocation in subpool 229, Key 7 It occurs when in the middle of CSQSVSTK processsing, trying to find a free SKB, and the TCB processing is switched from one CPU - in the reviewed case from a zIIP to GCP. This results in the FINDFREE routine not checking all CPU slots for a free SKB, which leads to the build-up of storage. . Additionl keywords: SP229 KEY7
Local fix
n/a
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: On systems with a large number of CPUs * * a steady increase in queue manager * * storage may be seen as reported by * * message CSQY220I. * **************************************************************** * RECOMMENDATION: * **************************************************************** During CSQSVSTK processing trying to find a free SKB, if the TCB is switched from one CPU to another the FINDFREE routine does not check all CPU slots for a free SKB. Hence extra storage may be allocated unnecessarily which leads to a build-up of storage.
Problem conclusion
Code has been changed so that the checking of CPU slots in the FINDFREE routine is unaffected by TCB processing switching from one CPU to another. 000Y CSQSVSTK
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
PI48558
Reported component name
WMQ Z/OS 8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-09-11
Closed date
2015-10-28
Last modified date
2016-01-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI32462
Modules/Macros
CSQSVSTK
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI32462
UP15/12/04 P F512 ¢
Fix is available
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Document Information
Modified date:
04 January 2016