Knowing the execution time of your matlab.
Matlab wall clock time.
I am trying to simulate a model using the simulink desktop real time in external mode and as mentioned in the title i have an s function block.
Maximumwallclock is a property of a configset object.
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.
This property sets the maximum elapsed wall clock time seconds criteria to stop a simulation.
This option is the most computationally expensive measurement and has the most impact on.
I tried to measure the time taken by a program to execute in matlab by using the tic and toc function.
The documentation for the matlab function clock describes exactly what the elements of that vector represent.
Useful clock resolution is around 10ms on windows machines and better in linux or macos.
The mex files that are used by the s function block are created using c source.
Because of this there is very little or no drift over many seconds.
The returned cpu time is expressed in seconds.
Use the wall clock time directly from the processor.
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.
Cputime returns the total cpu time in seconds used by your matlab application from the time it was started.
The documentation page to which you linked is for the simulink source block not the function in matlab.
Sometimes your power savings settings or use of multiple processors influence this measurement timer real use system time reported by the operating system.
The returned cpu time is expressed in seconds.
There will always be some jitter when attempting soft real time on a non real time operating system like windows standard linux or macos.
Total elapsed wall clock time.
I got 0 7283 as a value.
Each call to cputime returns the total cpu time used by matlab up to the point when the function is called.
The clock function calculates the current date and time from the system time.
Each call to cputime returns the total cpu time used by matlab up to the point when the function is called.
T cputime returns the total cpu time used by matlab since it was started.
T cputime returns the total cpu time used by matlab since it was started.
This number can overflow the internal representation and wrap around.