5. FILES › 5.3 SCP Information Area Files › 5.3.6 Address Space Activity File (SCPARD) › 5.3.6.3 Usage Considerations

5.3.6.3 Usage Considerations

Special considerations or techniques related to using the
SCPARD file are provided below.

1. The start timestamp of the record must be calculated from
   the end timestamp of the previous ARD record.  STARTTS and
   DURATION are calculated as the difference between two
   record timestamps.  For the first ARD record from a
   Monitor II session, STARTTS and DURATION are set to
   missing values.

2. In the first record from a Monitor II session, the values
   for ARDTTX, ARDTTM, ARDTCBTM, ARDPSSEC, ARDCPUTM, ARDSER,
   ARDTAT, and ARDEXCPS are the step totals.  In all other
   cases, the values computed are interval totals.

3. ARDTAT, ARDSER, and ARDTTX may only be measured for
   address spaces in memory when the record is written.
   These fields are set to missing for address spaces out of
   memory.  The values calculated for these fields represent
   the values accumulated between successful measurements.