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 IBM MQ for z/OS Version 9 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.
Temporary fix
Comments
APAR Information
APAR number
PI74030
Reported component name
MQ Z/OS V9
Reported component ID
5655MQ900
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
2017-03-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI44033
Modules/Macros
CMQXRSTF CSQXJST None
Fix information
Fixed component name
MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R000 PSY UI44033
UP17/02/08 P F702
Fix is available
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Document Information
Modified date:
02 March 2017