Law of parallel programming

There is a law of parallel programming but I can't find a link to it. Shortly it tells the following: if 1/3 of time your program is executed sequentially (in one thread), you can increase you开发者_JAVA技巧r application performance only 3 times.

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Amdahl's law refers to the old single-core CPUs. You may want to read carefully what happens on current multi-core CPUs. See

Amdahl's Law in the Multicore Era

and the related page where you will find additional resources.

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That would be Amdahl's Law.