About counting flops for matrix multiplication

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Bo Wang 2016-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/272694-about-counting-flops-for-matrix-multiplication

评论： Walter Roberson 2016-3-11

采纳的回答： the cyclist

How can I count flops for matrix multiplication? Should I use timing function or others?

Thank you!

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the cyclist 2016-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/272694-about-counting-flops-for-matrix-multiplication#answer_213161

This function from the File Exchange claims to do this. (I've never used it, so I cannot vouch for it.)

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Walter Roberson 2016-3-11

Writing that took some dedication!

Note to Bo Wang: You cannot count flops by timing on any modern system. It has been effectively impossible since the first RISC CPU came out, if not earlier. And that was decades ago, the Sun SPARC or earlier. 1981 is sometimes given as the date after which flops became meaningless.

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