However if i measured it using a stopwatch i got 27 sec as the time.
Matlab wall clock time.
The documentation page to which you linked is for the simulink source block not the function in matlab.
Each call to cputime returns the total cpu time used by matlab up to the point when the function is called.
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.
There will always be some jitter when attempting soft real time on a non real time operating system like windows standard linux or macos.
The clock function calculates the current date and time from the system time.
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.
T cputime returns the total cpu time used by matlab since it was started.
This number can overflow the internal representation and wrap around.
A simulation stops when it meets any of the criteria specified by stoptime maximumnumberoflogs or maximumwallclock however if you specify the outputtimes property of the solveroptions property of the configset object then.
T cputime returns the total cpu time used by matlab since it was started.
The documentation for the matlab function clock describes exactly what the elements of that vector represent.
This option is the most computationally expensive measurement and has the most impact on.
The mex files that are used by the s function block are created using c source.
Maximumwallclock is a property of a configset object.
Because of this there is very little or no drift over many seconds.
Cputime returns the total cpu time in seconds used by your matlab application from the time it was started.
This property sets the maximum elapsed wall clock time seconds criteria to stop a simulation.
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.
I got 0 7283 as a value.
Example c tf clock returns a second output argument that is 1 true if the current date and time occur during daylight saving time dst in your system s time zone and 0 false otherwise.
Sometimes your power savings settings or use of multiple processors influence this measurement timer real use system time reported by the operating system.
I tried to measure the time taken by a program to execute in matlab by using the tic and toc function.
Useful clock resolution is around 10ms on windows machines and better in linux or macos.
Total elapsed wall clock time.
Knowing the execution time of your matlab.
Each call to cputime returns the total cpu time used by matlab up to the point when the function is called.