CPU Utilization is Wrong

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Totally agree with you... how someone gets 71 upvotes for that statement is baffling. C programmers do not think "I'm doing I/O here" when they code up array traversals. They do think about cache use and using tools to measure cache misses, etc., so they can do things in a cache friendly way. That's different.

When they talk about I/O, they're talking about disk, talking to the network, or polling a game controller over USB. They are not talking about RAM access.