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== Aspects of performance ==
Computer performance [[Software metric|metrics]] (things to measure) include [[availability]], [[Response time (technology)|response time]], [[channel capacity]], [[Latency (engineering)|latency]], [[completion time]], [[service time]], [[Bandwidth (computing)|bandwidth]], [[throughput]], [[relative efficiency]], [[scalability]], [[performance per watt]], [[Data compression|compression ratio]], [[instruction path length]] and [[speed up]]. [[CPU]] benchmarks are available.<ref>{{citation|title=Measuring Program Similarity: Experiments with SPEC CPU Benchmark Suites|year=2005 |pages=10–20 |citeseerx=10.1.1.123.501 }}</ref>
=== Availability ===
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{{Main|Response time (technology)}}
Response time is the total amount of time it takes to respond to a request for service. In computing, that service can be any unit of work from a simple [[computer data storage|disk IO]] to loading a complex [[web page]]. The response time is the sum of three numbers:<ref>{{cite book | last = Wescott | first = Bob | title = The Every Computer Performance Book, Chapter 3: Useful laws
* Service time - How long it takes to do the work requested.
* Wait time - How long the request has to wait for requests queued ahead of it before it gets to run.
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