Six questions on why modern CPUs pack more execution units than most code can keep busy, how the out-of-order engine tries to feed them, and what limits instruction-level parallelism in practice.
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A modern out-of-order core like Intel Golden Cove has roughly a dozen execution units, but most real workloads keep only 40 to 60 percent of them busy. Why does the chip still carry all those extra units?
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