How is GC cpu utilization % calculated?

I am trying to find a way to capture the problem where a user process eats up a ton of cpu for over 30 minutes. I thought that I could possibly use the cpu utilization metric.
In testing it, I reset the values to warning and critical thresholds to 0 and 5% respectively to see what would happen. I was emailed with the expected critical alert. In looking at the top sessions on the server, I noticed that 1 session was eating up 100% of one cpu (which I want to know about) but the alert email said that 45% was utilized which I noticed was about what the user load is on the server.
Initially, I had the warning and critical threshold set to 85 and 95% respectively but did not get any warning about a user process that was taking up 100% cpu for > 5 minutes (in which the 5 minute collect times were set to once).
My questions are
1) How do I capture a single process eating up > 90% cpu in a multi-cpu environment
2) Is the cpu utilization % capturing the Average Load of the cpus on the server and alerting when it's above the critical threshold?
3) How is the cpu utilization % calculated?
Help would be appreciated.

The cpu load is determined by running the Grid program nmupm found in $AGENT_HOME/bin
The output is like:
dbc12ykf: PDBGRP> nmupm osCpuUsage
em_result=1|206331806.000000|201540370.000000|102524043.000000|958620752.000000
em_result=2|212731589.000000|201203614.000000|67775500.000000|948506267.000000
em_result=3|212402913.000000|230642957.000000|76833167.000000|917779040.000000
em_result=4|242543014.000000|367865067.000000|81554006.000000|791426607.000000
You will get a line for each cpu.
YOu'll need a bit of reverse engineering to figure out the columns - I think they are user, system, idle , 5min avg - Multiplied by 10000 ?
Now to capture a big one - I think you will need a user defined metric. Just write a simple shell script to run the above command, and evaluate the numbers coming thru.

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