A fix is available
APAR status
Closed as program error.
Error description
Excessive storage allocation and free operations for SVRCONN channels with a SHARECNV value greater than zero . Additional Symptom(s) Search Keyword(s): CHIN trace has many CSQXGETS calls obtaining 688 or 0x2B0 bytes for rstSTREAMQUEUE storage, which has an eyecatcher of RSTQ . . MQOPEN MQCLOSE performance
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Increased CPU usage in Chinit when * * using SVRCONNs with SHARECNV greater * * than zero with workload that frequently * * opens and closes queues. * **************************************************************** * RECOMMENDATION: * **************************************************************** When a SVRCONN channel is using shared conversations and is frequently opening and closing queues, additional storage for control blocks is regularly obtained and released. While this is correct behavior, applications that perform a large number of queue open and close operations may find that the additional overhead of this storage management begins to have an impact on Chinit performance exhibiting high CPU in IGVGPVT.
Problem conclusion
Some control blocks associated with opening and closing queues have been moved to z/OS cellpools to improve efficiency. 000Y CMQXRSTF CSQXJST
Temporary fix
Comments
APAR Information
APAR number
PI74029
Reported component name
WMQ Z/OS 8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-12-20
Closed date
2017-01-18
Last modified date
2017-04-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI44032
Modules/Macros
CMQXRSTF CSQXJST
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI44032
UP17/03/04 P F703
Fix is available
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Document Information
Modified date:
04 April 2017