Monitoring line activity

You can obtain a summary of all occurrences of activity for each node that handles message traffic during the monitored interval. The elapsed times and not-wait times are given in categories of total, mean, and maximum times for each communication line in the Communication-Summary report.

The following example illustrates this report.

You must match which physical devices are using the line to the Stage 1 output from system definition. The line numbers are assigned sequentially, according to their physical occurrence in the Stage 1 input deck.

If your online system specifies the prefetch option for MFS blocks in the control region JCL, the last line of the report contains the statistics for all prefetch events.

     IMS MONITOR   ****COMMUNICATION SUMMARY****  TRACE START 1993 130   5:55:15  TRACE STOP  1993 130   5:59:49  PAGE 0089
                                                   (A)                                 (B)
     NODE OR                           ........ELAPSED TIME.........       NOT IWAIT TIME(ELAPSED-IWAIT)    DISTRIBUTION
   LINE NUMBER       OCCURRENCES       TOTAL        MEAN     MAXIMUM       TOTAL        MEAN     MAXIMUM      NUMBER
   ____ ______       ___________       _____        ____     _______       _____        ____     _______      ______
     PMTO1A                    3        2396         798        1547        2396         798        1547        1467A,B
         19                  182       92155         506        1106       92155         506        1106        1493A,B
          2                   59        2280          38          41        2280          38          41        1515A,B
      TOTAL
      _____                  244       96831         396                   96831         396

You can also investigate the amount of data transmitted across nodes with the Line-Functions report. The following example illustrates this report. The report distinguishes between input data and output data. The number of blocks of data and the average and maximum size of the blocks are recorded for data received by IMS and for transmitted data.

This report also includes a measure of how inactive the lines are. An inactive interval is assumed to be the difference between the time that marks the end of the last input block received and the starting time for output transmission. These occurrences of inactivity are termed turnaround intervals, and the report cumulates the number of occurrences as well as the average and maximum times associated with these intervals.

If the line is being used by an MFS-supported terminal, a count of the number of requests for next page for a multipage message is recorded.

If link traffic for coupled multiple systems is recorded, a set of three reports follows the Line Functions report. These are described in IMS Monitor reports for MSC.

     IMS MONITOR   ****LINE FUNCTIONS***               TRACE START 1993 130   5:55:15     TRACE STOP  1993 130   5:59:49  PAGE 0091
                              (A)......................(B)...............                      ......................
                              MEAN     MAX.            MEAN    MAX.     .         TURN         .                    .
  NODE OR   DEVICE  RECEIVE RECEIVE RECEIVE   TRANS.  TRANS.  TRANS.  DIST.      AROUND       MEAN         MAX.   DIST.   PAGING
LINE NUMBER  TYPE    BLOCKS BLKSIZE BLKSIZE   BLOCKS BLKSIZE BLKSIZE NUMBER    INTERVALS    INTERVAL    INTERVAL  NUMB.  REQUESTS
____ ______  ____    ______ _______ _______   ______ _______ _______ ______    _________    ________    ________  _____  ________
  PMTO1A    3270V         1      29      29        2     170     171   1468A,B         3         798        1547  1466          0
       19   XXXX                                                                     182         506        1106  1492          0
        2   LOC SYS                                                                   59          38          41  1514          0
ALL LINES
___ _____                 1      29                2     170                         244         396                            0