In order to get the value you want you need the counter itself (cpu_busy) and the base counter (which I believe is processor_elapsed_time). You would then need to read the values at two different points in time and do some math...
# where t1 = first reading and t2 = second reading...
((t2.cpu_busy - t1.cpu_busy) / (t2.processor_elapsed_time - t1.processor_elapsed_time)) * 100 = % CPU busy during that time span
The base counter, if one is used, is returned back when you query the perf-object-counter-list-info API.
In general there are several different types of counters you'll find...
- raw: single counter value is used
- delta: change in counter value between two samples is used
- rate: delta divided by the time in seconds between samples is used
- average: delta divided by the delta of a base counter is used
- percent: 100*average is used
More information can be found in the ZAPI docs, under the cluster -> perf category. I also wrote an introduction, using PowerShell, here.
Hope that helps!
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