Terminal I/O

Monitoring Steps

The following steps can be taken to monitor terminal I/Os:

Run the mapping utility (RHDCMPUT) for a report on a specific map. This report will display a picture of the map and the attributes currently assigned to the map. The report will also indicate whether BACKSCAN is enabled for any mapping fields. If BACKSCAN is in effect and the NEWPAGE option on the ADSO statement has been selected, extraneous data from the previous mapout may be left on the screen when a map is redisplayed. It is advantageous to have NEWPAGE in effect, however, because this option increases runtime efficiency by reducing the number of data fields that need to be transmitted to the terminal. For more information about the NEWPAGE feature, refer to the CA ADS Reference Guide.
Use DCMT VARY PTERM pterm-id TRACE ALLIO FF to cause the datastream being transmitted to the terminal to be written to the log as well.
Use SHOWMAP map-name in conjunction with DCUF USERTRACE to cause the datastream of a particular map to be traced.
Use DCMT VARY PTERM pterm-id TRACE ALLIO OFF to turn off the trace, suppressing any further transmission of datastreams to the log.
Run the print log utility (RHDCPRLG) to show the actual trace. Specify the following parameters in the utility JCL:
```
PRINT ALL FOR ALL
FROM time ON date
TO time ON date
```

Transmission times can be calculated by analyzing the length of the datastream.