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systems-performance/USE-method.md

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@@ -8,12 +8,14 @@ Source: <https://www.brendangregg.com/usemethod.html>
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> For every resource, check utilization, saturation, and errors.
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Terminology definitions:
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- resource: all physical server functional components (CPUs, disks, busses, ...).
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- utilization: the average time that the resource was busy servicing work.
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- saturation: the degree to which the resource has extra work which it can't service, often queued
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- errors: the count of error events.
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The metrics are usually expressed in the following terms:
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- utilization: as a percent over a time interval. eg, "one disk is running at 90% utilization".
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- saturation: as a queue length. eg, "the CPUs have an average run queue length of four".
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- errors: scalar counts. eg, "this network interface has had fifty late collisions".

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