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. |
IBM MQ statistics are written to SMF as SMF type 115
records. The following subtypes can be present:
- 1
- System information, for example, related to the logs and storage.
- 2
- Information about number of messages and paging information. Queue sharing group information related to the coupling facility and Db2.
- 5 and 6
- Detailed information about internal storage usage in the queue manager address space. While you can view this information, some of it is intended only for IBM use.
- 7
- Storage manager summary information. While you can view this information, some of it is intended only for IBM use.
- 215
- Buffer pool information
- 231
- System information for the channel initiator address space.
- Subtype 1, 2, and 215 records are created with statistics trace class 1.
- Subtype 7 records are created with statistics trace class 2.
- Subtype 5 and 6 records are created with statistics trace class 3.
- Subtype 231 records are created with statistics trace class 4.
The subtype is specified in the SM115STF field (shown in Table 1 ).