Measure simulink step time

Hello, I have a problem with a slow Simulink model and want to measure each time step in order to see how long time the execution takes. I use a fixed time step with a discrete solver and the step size is 0.01 seconds. Does anyone know how to measure how long each time step takes, i.e. how long real time for each sample? I tried to started digging and tested tic/toc and sim(modelname, 'Stoptime', 'simstoptime') in order to see how long the simulation takes with a fixed stop time but that only gives me the elapsed times for initialization, execution, termination and the total time. So this is not what I want to check, I want to know how long time each simulation step takes.

[Francois Godin]

Hi Marlo, One way I found was to create a matlab function as follow:

function ExecTime = fcn(SimTime)
%#codegen
persistent t0;
coder.extrinsic('etime','clock')
if isempty (t0)
    t0=clock;
    ExecTime=0.0;
end
tnow = etime(clock,t0);
ExecTime = tnow;

I am using this with a variable step solver, so to avoid wasting too much CPU, I forced the block sampling with a rate transition. This would not work with code-generation as it uses extrinsic (matlab) functions.

Now, I am trying to extract other execution statistics such as step size, simulation order, ... to allow easier selection of the solver settings.

If anyone has an idea, let me know!

Answer 1

[Nicolas Schmit]

Use the Solver Profiler.

[Francois Godin]

Bummer, introduced in 2017b. We are limited here at 2015a due to the Mathworks discontinued support to 32bit code generation.