RE: What's a CPU second?

Charles Mills wrote:

Thanks Chris. You have in fact hit upon the fundamental problem here: not
mine, but my associate's. As I explained it to my (non-technical) wife, what
he is doing is akin to saying "if it takes me an hour to drive into town
now, how long will it take if I get a car with more seats and twice the
horsepower?" Umm, probably about an hour.

Lindy writes:

I saw this thread and thought this was a great question because I was a bit confused about CPU seconds. I've read every entry in this thread and came out more confused than when I started.

Isn't the CPU time the amount of time that the CPU(s) spent doing the work? (All TCB's and all CPU's together) So if I have a job that uses 10 CPU seconds on a 500 MIPS machine and I upgrade to 1000 MIPS it may only take 4 CPU seconds, no? That's what I _think_ I've seen when a machine got upgraded, but after reading this thread I've read what I thought was that the CPU time might go up a bit after such an upgrade. Or was it an upgrade of adding additional CPU's that was in question?

And in each of the answers to the OP, I never saw the term MIPS used. I saw the term MSU a lot. Are they about the same thing?

Thanks,
Lindy

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