Interpreting IBM MQ for z/OS performance statistics
Use this topic as an index to the different SMF records created by IBM MQ for z/OS .
IBM MQ for z/OS 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 we 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 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 we can view this information, some of it is intended only for IBM use.
- 201
- Page set input/output information
- 215
- Buffer pool information
- 231
- System information for the channel initiator address space.
Note that:
- Subtype 1, 2, 201, 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 ).
- Layout of an SMF type 115 record
We can use this section as a reference for the format of an SMF type 115 record. - The SMF header
Use this topic as a reference for the format of the SMF header. - Self-defining sections
Use this topic as a reference for format of the self-defining sections of the SMF record. - Examples of SMF statistics records
Use this topic to understand some example SMF records. - Processing type 115 SMF records
Use this topic as a reference for processing type 115 SMF records. - Storage manager data records
Use this topic as a reference for storage manager data records. - Log manager data records
Use this topic as a reference for format of log manager data records. - Message manager data records
Use this topic as a reference for message manager data records. - Data manager data records
Use this topic as a reference for the format of the Data Manager data records. - Data manager page set data records
Use this section as a reference for the format of the data manager page set data records - Buffer manager data records
Use this topic as a reference for the format of buffer manager data records. - Lock manager data records
Use this topic as a reference to the format of the lock manager data records. - Db2 manager data records
Use this topic as a reference to the format of the Db2 manager data records. - Coupling facility manager data records
Use this topic as a reference to the format of the coupling facility manager data records. - Topic manager data records
Use this topic as a reference to the format of the topic manager data records. - Coupling facility manager SMDS data records
Use this topic as a reference to the format of the coupling facility manager shared message data set (SMDS) data records. - Layout of channel initiator SMF type 115 records
The layout of channel initiator statistics data (SMF type 115, subtype 231) records is described in this topic. - Channel initiator statistics data records
Use this topic as a reference for channel initiator statistics data records.
Parent topic: Monitor performance and resource usage on z/OS