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MFLOPS (millions of floating-point operations per second) was commonly used to gauge computer system performance up...

MFLOPS (millions of floating-point operations per second) was commonly used to gauge computer system performance up until the 1980s. Explain why it can be a very poor measure of a processor’s performance. Are there any circumstances under which it is a valid measure of performance? If so, describe those circumstances.

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Answer #1

`Hey,

Note: Brother if you have any queries related the answer please do comment. I would be very happy to resolve all your queries.

It misses one very important point: memory bandwidth. A fast CPU may sound impressive, and PR people will always talk in terms of theoretical peak performance, etc., but in reality a CPU's best possible performance totally depends on the rate at which it can access data from the various kinds of memory (L1 / L2 cache and main RAM). A fast CPU in a system with low memory bandwidth will not perform anywhere near its theoretical peak (eg. 500MHz Alpha). I have studied the effect of this on the 195MHz R10000 and the results are very interesting.

The computers which offer same memory performances should need this kind of calculation since at that time bandwidth won't be a problem.

Kindly revert for any queries

Thanks.

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