There are a couple of different examples of ResUsageSAWT output in the original text. Lets consider them separately.
The first example, under the heading The CollectIntervals Column, represents the AMP worker task in-use counts at the end of a 60 seconds logging and collect interval (where the 2 intervals are equal). It is not really representing the work done in 60 seconds, rather it is a snapshot of the in-use counts (number of AMP worker tasks that are being used) at the end of the collect interval.
The other 2 examples, under the heading Real-World Example Before and After the SQL Adjustment, show a case where the logging interval is longer than the collect interval. In those cases, the in-use counts have undergone a division and represent an average of the in-use counts across all collect intervals contained within the logging interval. That is why they carry an odd-looking decimal place.
Thank you for your question. I hope my response is helpful in answering it.
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