The Performance Design Metric

Performance of a system is a measure of how long the system takes to execute our desired tasks.

The two main measures of performance are:

Latency or response time:

This is the time between the start of the task’s execution and the end. For example, processing an image may take 0.25 second.


Throughput:

This is the number of tasks that can be processed per unit time. For example, a camera may be able to process 4 images per second
These are the some of the cost measures for developing an RTES. Optimization of the overall cost of design includes each of these factors taken with some multiplying factors depending on their importance. And the importance of each of these factors depends on the type of application. For instance in defense related applications while designing an anti-ballistic system the execution time is the deciding factor. On the other hand, for de-noising a photograph in an embedded camera in your mobile handset the execution time may be little relaxed if it can bring down the cost and complexity of the embedded Digital Signal Processor.

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