Using frequency distributions from IMS Monitor output

The reports derived from the IMS Monitor data records contain many summary lines where the mean time is given. If you are interested in the distribution of those timed events, rather than just average and maximum times, you can request the Report Print utility to individually record the events in a frequency distribution across a range of intervals.

Some distributions are not time dependent, such as those for transaction queue loads or transmitted block sizes.

The following tables show the major IMS Monitor reports and the type of frequency distributions generated for each report. Each type results in several distributions, depending on how many entries are in each section of the report. For each type of frequency distribution, the data is cumulated in suitable intervals or ranges. The set of ranges used for each type is given an identifier, shown in the ID column.

• The following table shows the report distributions sorted by region summary.

  Table 1. Distribution reports by region summary

  Report name	ID	Description
  Schedule end to 1st DL/I call	D1	Elapsed time
  Elapsed execution time	D2	Not wait time
  DL/I calls	D3	N/A
  	D4	N/A
  External Subsystem calls	D5	Elapsed time
  Waits per DL/I call	D6	Not wait time
  Idle for intent	D43	Elapsed time
  Checkpoint	D7	N/A
  	D8	N/A
  	D20	Elapsed time
  	D21	Not wait time

• The following table shows the report distributions sorted by program region.

  Table 2. Report distributions by program region

  Report name	ID	Description
  Elapsed execution time	D30	N/A
  Schedule end to 1st DL/I call	D31	N/A

• The following table shows the report distributions sorted by program summary.

  Table 3. Report distributions by program summary

  Report name	ID	Description
  Processor time per schedule	D15	N/A
  Transactions dequeued per schedule	D14	N/A
  Elapsed time per schedule	D9	N/A
  Schedule end to 1st DL/I call	D10	N/A

• The following table shows the report distributions sorted by communication summary.

  Table 4. Report distributions by communication summary

  Report name	ID	Description
  Line elapsed time	D18	N/A
  Line not wait time	D19	N/A

• The following table shows the report distributions sorted by line functions.

  Table 5. Report distributions by line functions

  Report name	ID	Description
  Received block length	D36	N/A
  Transmitted block length	D37	N/A
  Inactive intervals	D38	N/A

• The following table shows the report distributions sorted by MSC queuing summary.

  Table 6. Report distributions by MSC queuing summary

  Report name	ID	Description
  Time in queue	D39	N/A

• The following table shows the report distributions sorted by transaction queuing.

  Table 7. Report distributions by transaction queuing

  Report name	ID	Description
  Transactions on queue at schedule	D17	N/A
  Transactions dequeued per schedule	D16	N/A
  Prefetch format blocks	D28	Elapsed time
  	D29	Not wait time

• The following table shows the report distributions sorted by call summary.

  Table 8. Report distributions by call summary

  Report name	ID	Description
  PSB waits per DL/I call	D13	N/A
  PSB waits per external subsystem call	D44	N/A
  PSB elapsed time per call	D11	N/A
  PSB not wait time per call	D12	N/A
  PSB external subsystem calls	D45	Elapsed time

• The following table shows some distributions derived from buffer pool statistics for wait times.

  Table 9. Wait time distributions

  Function	ID	Module key
  Storage	D22	SMN
  OSAM I/O	D23	DBH
  VSAM I/O	D24	VBH
  Scheduler internal	D25	MSC
  Queue manager I/O	D26	QMG
  Block loader I/O	D27	BLR
  MFS block I/O	D32	MFS
  MFS directory I/O	D33	MFS
  HSAM I/O	D34	DIE
  Format Buffer Pool Space	D35	PMM
  PI enqueue	D40	None
  QMGR SNAPQ Check	D42	None