Observed speedup and parallel overhead, Computer Engineering

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Observed Speedup

Observed speedup of a system which has been parallelized, is defined as:

634_Observed Speedup.png

Granularity is one of the easiest and most extensively used indicators for a parallel program's performance.

Parallel Overhead

The amount of time required to direct parallel tasks, as opposed to responsibility useful work. Parallel overhead can consist of factors such as:

Synchronisations
Task start-up time
Data communications
Software overhead forced by parallel compilers, tools, , libraries, operating system, etc.

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