...For the past seven years, Intel and AMD have emphasized multi-core CPUs as the answer to scaling system performance, but there are multiple reasons to think the trend towards rising core counts is largely over. First and foremost, thereâ€™s the fact that adding more CPU cores never results in perfect scaling. In any parallelized program, performance is ultimately limited by the amount of serial code (code that can only be executed on one processor). This is known as Amdahlâ€™s law. Other factors, such as the difficulty of maintaining concurrency across a large number of cores, also limit the practical scaling of multi-core solutions...
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