Transaction wait (suspend) times
The CMF performance class record provides a breakdown of the transaction suspend (wait) time into separate data fields. You can use these to calculate various wait times.
The performance data fields listed in Table 1 record the elapsed time spent waiting for specific types of I/O operation. For example, field 009 records the elapsed time waiting for terminal I/O.
The elapsed time includes the time for the I/O operation, the time for the access method to complete the outstanding event control block, and the subsequent time until the waiting CICS® transaction is redispatched.
Group Name | Field ID | Field Name | Description |
---|---|---|---|
DFHTERM | 009 | TCIOWTT | Terminal I/O wait time |
DFHJOUR | 010 | JCIOWTT | Journal I/O wait time |
DFHTEMP | 011 | TSIOWTT | Temporary storage I/O wait time |
DFHFILE | 063 | FCIOWTT | File I/O wait time |
DFHTERM | 100 | IRIOWTT | Interregion I/O wait time |
DFHDEST | 101 | TDIOWTT | Transient data I/O wait time |
DFHTASK | 123 | GNQDELAY | Global ENQ delay time |
DFHTASK | 128 | LMDELAY | Lock Manager delay time |
DFHTASK | 129 | ENQDELAY | Local ENQ delay time |
DFHTERM | 133 | LU61WTT | LU 6.1 I/O wait time |
DFHTERM | 134 | LU62WTT | LU 6.2 I/O wait time |
DFHFEPI | 156 | SZWAIT | FEPI suspend time |
DFHTASK | 171 | RMISUSP | Resource manager interface (RMI) suspend time |
DFHFILE | 174 | RLSWAIT | RLS File I/O wait time |
DFHFILE | 176 | CFDTWAIT | Coupling Facility data tables server I/O wait time |
DFHSYNC | 177 | SRVSYWTT | Coupling Facility data tables server sync point and resynchronization wait time |
DFHTEMP | 178 | TSSHWAIT | Shared temporary storage I/O wait time |
DFHTASK | 181 | WTEXWAIT | EXEC CICS WAIT EXTERNAL wait time |
DFHTASK | 182 | WTCEWAIT | EXEC CICS WAITCICS and WAIT EVENT wait time |
DFHTASK | 183 | ICDELAY | Interval Control delay time |
DFHTASK | 184 | GVUPWAIT | Dispatchable Wait wait time |
DFHDATA | 186 | IMSWAIT | IMS DBCTL wait time |
DFHDATA | 187 | DB2RDYQW | Db2® ready queue wait time |
DFHDATA | 188 | DB2CONWT | Db2 connection time |
DFHTASK | 191 | RRMSWAIT | RRMS/MVS™ indoubt wait time |
DFHTASK | 192 | RQRWAIT | Request Receiver wait time |
DFHTASK | 193 | RQPWAIT | Request Processor wait time |
DFHTASK | 195 | RUNTRWTT | CICS BTS run process/activity synchronous wait time |
DFHSYNC | 196 | SYNCDLY | Sync point delay time |
DFHSOCK | 241 | SOIOWTT | Socket I/O wait time |
DFHTASK | 247 | DSCHMDLY | CICS change TCB mode delay time |
DFHTASK | 250 | MAXOTDLY | CICS L8 and L9 mode open TCB delay time |
DFHTASK | 254 | JVMSUSP | JVM suspend time Be aware of the likelihood of double accounting that might be recorded in JVMSUSP. For details, see JVM elapsed time and suspend time. |
DFHTASK | 268 | DSTCBMWT | TCB mismatch wait time |
DFHTASK | 274 | DSMMSCWT | MVS user region or extended user region storage constraint wait time |
DFHTASK | 279 | DSMMSCWT | MVS storage constraint wait time |
DFHTASK | 281 | MAXSTDLY | CICS SSL TCB delay time |
DFHTASK | 282 | MAXXTDLY | CICS XP TCB delay time |
DFHTASK | 283 | MAXTTDLY | CICS JVM server thread TCB delay time |
DFHTASK | 285 | PTPWAIT | 3270 bridge partner wait time |
DFHSOCK | 299 | SOOIOWTT | MAXSOCKETS wait time |
DFHSOCK | 300 | ISIOWTT | IS I/O wait time |
DFHSOCK | 319 | ISALWTT | IPIC session allocation wait time |
DFHTERM | 343 | TCALWTT | MRO, LU6.1, and LU6.2 session allocation wait time |
DFHDATA | 396 | WMQGETWT | MQ GETWAIT wait time |
DFHTASK | 401 | JVMTHDWT | JVM server thread wait time. This does not apply to Liberty JVM servers. |
DFHDEST | 403 | TDILWTT | Transient Data intrapartition lock wait time |
DFHDEST | 404 | TDELWTT | Transient Data extrapartition lock wait time |
DFHFILE | 426 | FCXCWTT | File control wait time for exclusive control of a VSAM control interval |
DFHFILE | 427 | FCVSWTT | File control wait time for a VSAM string |
DFHTASK | 429 | DSAPTHWT | Dispatcher allocate pthread wait time |
DFHTASK | 475 | ASFTCHWT | EXEC CICS FETCH wait time |
DFHTASK | 476 | ASRNATWT | EXEC CICS RUN TRANSID attach wait time |
Figure 1 shows an example of the relationship between a typical transaction wait time field, and the transaction's suspend time, dispatch time, processor, and dispatch wait time fields. The transaction has a period of suspend time, which is the time between two periods of dispatch and processor time. The period of suspend time is equal to the total of all the relevant wait times. The period of suspend time includes the dispatch wait, which ends when the suspend time ends and the dispatch and processor time starts.
- Terminal control I/O wait
- Temporary storage I/O wait
- Shared temporary storage I/O wait
- Transient data I/O wait
- Journal (z/OS® logger) I/O wait
- File control I/O wait
- RLS file I/O wait
- Coupling Facility data table I/O wait
- Inbound Socket I/O wait
- IS I/O wait time
- Outbound Socket I/O wait
- Interregion (MRO) I/O wait
- LU 6.1 TC I/O wait
- LU 6.2 TC I/O wait
- FEPI I/O wait
- First dispatch delay. This field includes the MXT and TRANCLASS first dispatch delay fields.
- Local ENQ delay
- Global ENQ delay
- Interval control delay
- Lock manager delay
- Wait external wait
- EXEC CICS WAITCICS and EXEC CICS WAIT EVENT wait
- CICS BTS run synchronous wait
- CFDT server synchronous wait
- Request Receiver wait time
- Request Processor wait time
- Syncpoint delay time
- CICS L8 and L9 mode open TCB delay time
- CICS SSL TCB delay time
- CICS JVM server thread TCB delay time
- CICS XP TCB delay time
- CICS change-TCB mode delay time
- RRMS/MVS wait
- 3270 bridge partner wait
- TCB mismatch wait time
- JVM server thread wait time
- MVS storage constraint wait time
- Intrapartition transient data lock wait time
- Extrapartition transient data lock wait time
- File control wait time for exclusive control of a VSAM control interval
- File control wait time for a VSAM string
- IPIC session allocation wait time
- MRO, LU6.1, and LU6.2 session allocation wait time
- Dispatchable waits wait
- Dispatcher allocate pthread wait time
- EXEC CICS FETCH wait time
- EXEC CICS RUN TRANSID attach wait time
- MVS user region or extended user region storage constraint wait time
Uncaptured wait time = (Suspend - (total I/O wait time + total other wait time))
- The Program load time is the program fetch time (dispatch time) for programs invoked by the transaction. See Program load time.
- The Exception wait time is the accumulated time from the exception conditions as measured by the CMF exception class records. For more information, see Exception class data: Listing of data fields .
- The RMI elapsed time is the elapsed time the transaction spent in all Resource Managers invoked by the transaction using the Resource Manager Interface (RMI). See RMI elapsed and suspend time.
- The JVM elapsed time is the elapsed time the transaction spent in the Java Virtual Machine (JVM) for the Java programs invoked by the transaction. See JVM elapsed time and suspend time.
- The JVM initialization elapsed time is the elapsed time the transaction spent initializing the Java Virtual Machine (JVM) environment for all the Java programs invoked by the transaction.
- The Syncpoint elapsed time is the elapsed time the transaction spent processing a sync point. See Syncpoint elapsed time.