A fix is available
APAR status
Closed as program error.
Error description
Performance improvement of the CHIN when using C channel exits.
Local fix
Add the SCEERUN library to the STEPLIB of the CHIN.
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Increased CPU cost when using exits * * written using the C Systems Programming * * Environment and the CEEEV003 module * * from SCEERUN is in the LPA but not the * * Chinit STEPLIB. * **************************************************************** * RECOMMENDATION: * **************************************************************** When an exit is written using the C Systems Programming Environment, each time it is invoked it LOADs the CEEEV003 module. If this module is in the LPA (as is recommended by IBM), then the z/OS LOAD call can take considerably longer to locate the module. Since the module is also DELETEd after each invocation, the more expensive LOAD operation is repeatedly performed. This additional cost may significantly add to the overhead of invoking exits.
Problem conclusion
Processing has been amended to pre-load the CEEEV003 module for each MQ dispatcher TCB at startup. This can result in a considerable improvement for LOAD times when using SPC exits when the CEEEV003 module is located in the LPA. 000Y CSQXDISP
Temporary fix
Comments
APAR Information
APAR number
PI58641
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
2016-03-07
Closed date
2016-11-30
Last modified date
2017-02-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI71809 UI42995
Modules/Macros
CSQXDISP
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI42995
UP17/01/27 P F701
Fix is available
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Document Information
Modified date:
01 February 2017