Monitoring message handling efficiency

The IMS Monitor produces both summary and detailed information on asynchronous processing that takes place in the IMS control region. Asynchronous processing occurs when data transmitted from VTAM® arrives. Application program responses also result in asynchronous processing.

The space in four major buffer pools and access to format, SPA, and message queue data sets are managed for the total communications traffic. Wait times are recorded when contention for pool space or I/O interrupts the processing of any of the communication tasks triggered by line activity. This information is contained in the Communication Wait report, shown in the following example.

This report is similar to the Communication-Summary report because the line number identifies the series of communication processing tasks.

     IMS MONITOR   ****COMMUNICATION IWAIT*****        TRACE START 1993 130   5:55:15     TRACE STOP  1993 130   5:59:49  PAGE 0090
  NODE OR                      .........IWAIT TIME..........                                            DIST.
LINE NUMBER  OCCURRENCES       TOTAL        MEAN     MAXIMUM     FUNCTION           BLKSIZE  MODULE       NO.
____ ______  ___________       _____        ____     _______     ________           _______  ______      ____
ALL LINES...
PREFETCH I/O
________ ___        NONE