Hi Maryam,
Using parfor does not mean you are leveraging GPUs. Parfor runs multiple workers on the available cores of your system's CPU. Since GPU cores can not serve as parallel pool workers.
Thus using cputime function to calculate the time elasped looks fine to me.
However, if you want to run your code over GPUs, you can use parfor in conjunction with spmd statement.
To understand about how to use multiple GPUs in parallel pool you may refer to the following links:
To calculate total time elasped, you may also use the timeit function:
t = timeit(f) % f is the function handle
Timeit measures the time (in seconds) required to run the function specified by the function handle f. In order to perform a robust measurement, timeit calls the specified function multiple times and returns the median of the measurements. If the function runs fast, timeit might call the function many times.
Thanks
