> Has the bottleneck increasingly become memory rather than CPU? Yes. Besides the basic memory latency vs. CPU clock speed issue, there's also: - CPU caches

> Has the bottleneck increasingly become memory rather than CPU? Yes. Besides the basic memory latency vs. CPU clock speed issue, there's also: - CPU caches have gotten bigger, so the payoff of making an program cache-friendly is larger - CPUs have gained SIMD vector ALUs and increased superscalar behavior, so the CPU is capable of processing more data in per clock cycle - A cultural shift happened after the freewheeling Moore's Law era ended in the mid-2000s, and people started examining performance more closely http://gec.di.uminho.pt/discip/minf/ac0102/1000gap_proc-mem_speed.pdf http://gec.di.uminho.pt/discip/minf/ac0102/1000gap_proc-mem_...