Measure simulink step time

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Marlo Wegener
Marlo Wegener il 21 Nov 2017
Commentato: Francois Godin il 26 Gen 2018
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.
  1 Commento
Francois Godin
Francois Godin il 25 Gen 2018
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!

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Risposte (1)

Nicolas Schmit
Nicolas Schmit il 26 Gen 2018
  1 Commento
Francois Godin
Francois Godin il 26 Gen 2018
Bummer, introduced in 2017b. We are limited here at 2015a due to the Mathworks discontinued support to 32bit code generation.

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