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Message: [QUOTE="Billy Mays, post: 4214503"] The processor is SIMD so each thread runs the same code, but they modify their own data. As long as each thread executes the same instruction, the processor can simultaneously work on each thread's data. However, if one of the threads branches then the processor degrades (SISD?) and loses a lot of the parallelism. The goal here is to ensure each thread does exactly the same thing, even if it is slightly wasteful. Note: These are not OS threads; they are similar but lighter weight. [/QUOTE]