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When is it worthwhile to process in parallel?

• Operations should be stateless
• Lot of data, or a lot of time per element
• The operation must be associative: A op (B op C) == (A op B) op C

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When you use a parallel stream, the default implementation is to divide the work into a number of sections equal to the number of processors (common fork-join pool)

Each processor processes its own section

The results are all joined together at the end