When a WebSphere MQ queue manager stops, it releases the IPC resources that it was using back to the system. There are two situations in which this might not happen automatically:
In these cases, the IPC resources are not release back to the system until you manually remove them, or restart (strmqm) or delete (dltmqm) the queue manager.
WebSphere MQ provides a utility to release System V IPC resources allocated by the queue manager but not freed, for one of the above reasons, back to the system.
To check and free any unused System V IPC resources do the following
/opt/mqm/bin/amqiclen -x -m QMGR
/usr/mqm/bin/amqiclen -x -m QMGR
This command does not report any status. However, if some WebSphere MQ-allocated resources could not be freed because they were still in use, the return code is nonzero.
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