Simulink® Accelerator™ speeds up the execution of your model, by creating and compiling C code. This C code takes the place of the interpretive code that Simulink uses when in Normal mode (that is, when Simulink® is not in Accelerator mode). Simulink Accelerator generates the C code from the Simulink model and invokes the MATLAB® mex function to compile and dynamically link the generated code to Simulink. This code generation and compilation process happens the first time you accelerate the model and any time the model changes are significant enough to require re-generation (for example, the addition of a block).
The following example uses the slAccelDemoF14 model to illustrate the use of Simulink Accelerator.
Open the slAccelDemoF14 model and set the stop time to 3000 seconds. Simulate the model and time how long it takes using TIC/TOC.
modelName = 'slAccelDemoF14'; open_system(modelName) set_param(modelName,'stoptime','3000') tic sim(modelName); toc
Elapsed time is 12.737240 seconds.
To activate the Simulink® Accelerator, in the Simulink Editor, on the Simulation tab, under Simulate, select
Accelerator. You can also issue a
set_param command at the MATLAB® command prompt.
Since running in accelerated mode creates some files, first move to a temporary area.
originalDir = pwd; tempDir = tempname; mkdir(tempDir) cd(tempDir)
Build the accelerated model and simulate it. When running in Accelerator mode, you can start the model by selecting Run on the Simulation tab or by running the command:
at the MATLAB prompt. In either case, the progress of the code generation process will be displayed in the MATLAB command window. To suppress this display wrap the sim command inside an evalc.
Simulate the model again. Notice the model simulation runs much faster on subsequent runs.
tic sim(modelName); toc
Elapsed time is 2.520597 seconds.
Change the value of one of the tunable parameters in the model and simulate the model again. Notice the accelerated version of the model does not have to be re-generated and so the simulation still runs more quickly in Accelerated mode than in Normal mode.
modelWorkspace = get_param(modelName,'ModelWorkspace'); evalin(modelWorkspace,'Mw=Mw*2;') tic sim(modelName); toc
Elapsed time is 2.557686 seconds.
Close the model and remove the generated files.
bdclose(modelName) clear([modelName,'_acc']) cd(originalDir) rmdir(tempDir,'s')