for loop running time analysis

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mh z
mh z 2020-4-28
回答： Walter Roberson 2020-5-15
Profiler shows that "end" line takes a large part of the running time of for loop. Why? Do jump instructions really run longer than calculation process?

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Walter Roberson
Walter Roberson 2020-5-15
When MATLAB notices that patterns of code have been used that can be made more efficient by calling into the high-performance mathematically libraries such as MKL, then MATLAB does not execute the given code line-by-line, and it allocates the total time to the end-point of the section that it optimized. Also, the overhead of running the for loop is allocated against the end statement

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rajat aggarwal
rajat aggarwal 2020-5-15
Yes jump statement takes more time then usual line and here in your case you are using end statement in a loop. Jump statement hinders the workflow of a program. Usually Program counter jumps from one position to another position and start executing the instruction stored there. It requires time. Therefore jump statements take more time than usual statemtents.

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