Why can FFT of full vector measure the irregular access performance in MATLAB benchmark?

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yimeng li 2019-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/483015-why-can-fft-of-full-vector-measure-the-irregular-access-performance-in-matlab-benchmark

编辑： yimeng li 2019-10-1

Hello Everyone,

I read the discription of MATLAB built-in benchmark, which execute six tasks and evaluate the performance of PC.https://de.mathworks.com/help/matlab/ref/bench.html

One of these tasks is: FFT of long vectors and for this task perfomance factor is floating-point and irregular memory access. What is irregular memory access and why can FFT measure it?

Thanks!