Interpreting IBM MQ performance statistics
Use this topic as an index to the different SMF records created by IBM MQ for z/OS®.
IBM MQ performance statistics are written as SMF type 115 records. Statistics records are produced periodically at a time interval specified by the STATIME parameter of the CSQ6SYSP system parameter module, or at the SMF global accounting interval if you specify zero for STATIME. The information provided in the SMF records comes from the following components of IBM MQ:
| Buffer manager | Manages the buffer pools in virtual storage and the writing of pages to page sets as the buffer pools become full. Also manages the reading of pages from page sets. |
| Coupling facility manager | Manages the interface with the coupling facility. |
| Data manager | Manages the links between messages and queues. It calls the buffer manager to process the pages with messages on them. |
| Db2® manager | Manages the interface with the Db2 database that is used as the shared repository. |
| Lock manager | Manages locks for IBM MQ for z/OS. |
| Log manager | Manages the writing of log records, which are essential for maintaining the integrity of the system if there is a back out request, or for recovery, if there is a system or media failure. |
| Message manager | Processes all IBM MQ API requests. |
| Storage manager | Manages storage for IBM MQ for z/OS, for example, storage pool allocation, expansion, and deallocation. |
| Topic manager | Manages the Topic and Subscription information for IBM MQ for z/OS. |
| Coupling facility SMDS manager | Manages the shared message data sets (SMDS) for large messages stored in the coupling facility. |
- 1
- System information, for example, related to the logs and storage.
- 2
- Information about number of messages, buffer, and paging information. Queue sharing group information related to the coupling facility and Db2.
- 3
- More detailed information about storage usage in the MSTR address space.
- 201
- Page set input/output information
- 215
- Bufferpool information when the queue manager is running in OPMODE=(NEWFUNC,800) mode.
- 231
- System information for the CHIN address space.
Note that:
- Subtype 1, 2, 201, and 215 are created with statistics trace class(1)
- Subtype 3 with statistics trace classes 2 and 3
- Subtype 231 with statistics trace class(4)