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Residual utilization

Residual utilization is the offset value represented by resource utilization that is not caused by business drivers. It can be expressed as a utilization of resources when all business drivers are absent. This residual utilization occurs because of resident activity of the resource that brings about a non-zero utilization offset. In the case of the CPU, there is consumption of CPU resources even in the absence of a business driver.

The following table shows an example of residual utilization:

Using the service demand values, the total AS-CPU utilization percentage for this example can be calculated as ((PageRequests/sec x 10 -5 sec) + (SentMessages/sec x (2 x 10 -4 sec)))*100 + 10%.

Warning

Note

Mathematically, residual utilization is the intercept value of the same univariate or multivariate model found for service demand values.

The following figure shows how residual utilization appears for a performance versus load analysis in BMC Helix Capacity Optimization:

Business driver map of a performance versus load analysis – Residual Utilization tab
map5_RU.png

 

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BMC Helix Capacity Optimization 20.02