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LoadRunner analysis "resource usage"

I'm curious to know the logic Analysis uses to plot system resources with very different numbers all on one graph and what units are represented.

For example with my UNIX resources, I have a graph that has Context Switch Rate with values between 9000 and 43000. It graphs these around 15-20% "resouce usage" which is on the y-axis.

On the same graph, I have an average load statistic with values between ~3 and 7 which is reflected between 30 and 70% resource usage.

Any knowledge aboutwhat the significance of "resource usage" is and what units LR is measuring in?
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Re: LoadRunner analysis "resource usage"

'Resource Usage' is just a generic Y-axis title that applies to all counters on a graph of this type. It is not a percentage - it is simply a numeric index. Each counter in your graph may have a different measurement scale to allow the line to plot within the scale of the single Y-axis. If you right-click a conter in the legend and select 'Configure Measurements' you can change the scale to see how this works.
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