In computer programming, Amdahl's law is that, in
a program with parallel processing, a relatively few instructions that
have to be performed in sequence will have a limiting factor on program
speedup such that adding more processors may not make the program run
faster. This is generally an argument against parallel processing for
certain applications and, in general, against overstated claims for parallel
computing. Others argue that the kinds of applications for which parallel
processing is best suited tend to be larger problems in which scaling
up the number of processors does indeed bring a corresponding improvement
in throughput and performance.
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