Fixes are available
APAR status
Closed as program error.
Error description
AIX shared-binding applications use shared memory to communicate with WebSphere MQ queue manager processes. Where a segment is being accessed by 32 bit applications, the time cost of the shmdt() AIX operating system call to detach shared memory is high. The effects of this can be seen in the MQCONN and MQDISC API calls, possibly taking up to 500 ms to return.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: AIX users with a high rate of MQCONN/MQDISC noticing delays Platforms affected: AIX **************************************************************** PROBLEM SUMMARY: This APAR will reduce the number of shmat/shmdt operating system calls being made by amqrmppa processes, which will reduce the cost of connect and disconnect activity across the MQ system as a a whole. Before this APAR, amqrmppa creates a shared memory attachment per thread.
Problem conclusion
After the change in this APAR, a single shared memory attachment is created in amqrmppa that is shared by future threads. The number of shmat and shmdt operating system calls being made from the amqrmppa process is then reduced, which will reduce the possibility for performance bottlenecks in connect and disconnect activity taking place in all other WebSphere MQ programs. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v7.0 7.0.1.13 v7.1 7.1.0.5 v7.5 7.5.0.4 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IV52435
Reported component name
WMQ AIX V7
Reported component ID
5724H7221
Reported release
701
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-11-22
Closed date
2014-01-20
Last modified date
2014-01-20
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
WMQ AIX V7
Fixed component ID
5724H7221
Applicable component levels
R701 PSY
UP
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Document Information
Modified date:
31 March 2023