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I was reading about Amdahl's law and it state that value of Amdahl's law always lies between 0 and 1. My question is, is it still true in today's case/scenario? When we have system like core i7?

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  • $\begingroup$ Amdahl's law is a horribly way to think about parallelism, but other than that ... sure. $\endgroup$ – Raphael Aug 2 '17 at 16:04
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Yes, it's still true. The speedup can't be less than zero (if parallelizing your code makes it slower, just run the serial version) or more than 100% (because saving more than 100% of the runtime would make the runtime negative).

Multicore processors are essentially just a matter of terminology changing over time. If you think you have one processor with four cores, Amdahl thinks you have four processors.

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