If you are using MQ v7.0.1 on z/OS with a security exit (i.e. z/MQAUSX) and the SVRCONN channel’s attribute SHARECNV is greater than 0 then you may be experiencing a slow memory leak as given in the following IBM APAR (# PI08162):
https://www.ibm.com/support/pages/apar/PI08162
Regards,
Roger Lacroix
Capitalware Inc.