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Timing

When measuring the performance of parallel programs, it is usually wall clock time, not CPU time, that matters. The reason is that better parallelization typically increases aggregate CPU time by employing more CPUs. The goal of parallelizing a program is usually to make it run faster in real time.

Algorithms

Most parallel algorithms provided by Intel® Threading Building Blocks (Intel® TBB) are generic. They operate on all types that model the necessary concepts. Parallel algorithms may be nested. For example, the body of a parallel_for can invoke another parallel_for.

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