Questions about Amdahl's law?
Amdahl's law is used to get an idea about where to optimize while considering parallelism.The theory of doing computational work in parallel has some fundamental laws that place limits on the benefits one can derive from parallelizing a computation. Amdahl's Law have detalied explanation of Amdahl's law and it's use.
Processor comes with some other resources like cache which can affect the performance. So if we add more processor, cache memory also increases. Each processor will get less data size to process that can fit into processor's cache which will increase the Performance(Superlinear speedup). But Amdahl's Law considers processors as the only resource but does not consider cache memory.