Source : Free On-Line Dictionary of Computing

Amdahl's Law
     
         (Named after {Gene Amdahl}) If F is the fraction of
        a calculation that is sequential, and (1-F) is the fraction
        that can be parallelised, then the maximum {speedup} that can
        be achieved by using P processors is 1/(F+(1-F)/P).
     
        [Gene Amdahl, "Validity of the Single Processor Approach to
        Achieving Large-Scale Computing Capabilities", AFIPS
        Conference Proceedings, (30), pp. 483-485, 1967].
     
        (2002-10-16)