cpu time in matlab

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E 2020-10-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/629068-cpu-time-in-matlab

回答： Walter Roberson 2020-10-28

i have used this cpu time function to calculate my code time to compare to another code but every time run the code i found cpu time completely different

0.6 0.8 1.2 0.5

i dont know where the problem or if there is more accute function in matlab

t = cputime;
my algorithm
e = cputime-t

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Answer 1

Walter Roberson 2020-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/629068-cpu-time-in-matlab#answer_526888

See timeit()

Note though that timeit() deals with elapsed time rather than cpu time -- but it takes a number of steps to try to reduce inaccuracies in calculation.

If that is not specific enough for your purposes, then use .NET assembly to access the CPU cycle counters.https://www.mathworks.com/matlabcentral/answers/44352-cpu-cycles-count-for-simulink-model#answer_54380

Note: many "large enough" MATLAB operations automatically use multiple cores, and getting the CPU cycle counts will not total the CPU cycles across multiple cores. CPU cycle counts are not nearly as meaningful as one might hope.