cputime

CPU time used by MATLAB

Description

example

t = cputime returns the total CPU time used by MATLAB® since it was started. The returned CPU time is expressed in seconds.

Each call to cputime returns the total CPU time used by MATLAB up to the point when the function is called. To measure the CPU time used to run your code, place two calls to cputime before and after the code, and then calculate the difference between the returned values.

Examples

collapse all

Measure the CPU time used to run surf(peaks(40)).

tStart = cputime;
surf(peaks(40))

tEnd = cputime - tStart
tEnd = 0.3400

Tips

  • To measure the performance of your code, use the timeit or tic and toc functions. Unlike the cputime function, which measures CPU time, timeit or tic/toc return wall-clock time.

    For example, the CPU time for pause is typically small:

    tStart = cputime;
    pause(1)
    tEnd = cputime - tStart
    
    tEnd =
    
        0.1094
    

    However, the wall-clock time accounts for the actual time that MATLAB execution is paused:

    tic
    pause(1)
    toc
    Elapsed time is 1.000483 seconds.
    

    For more information, see Measure the Performance of Your Code.

Introduced before R2006a