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Choosing a Simulation Mode

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Tradeoffs Comparing Modes Decision Tree

Tradeoffs

In general, you must trade off simulation speed against flexibility when choosing either Accelerator mode or Rapid Accelerator mode instead of Normal mode.

Normal mode offers the greatest flexibility for making model adjustments and displaying results, but it runs the slowest. Rapid Accelerator mode runs the fastest, but this mode does not support the debugger or profiler, and works only with those models for which C code is available for all of the blocks in the model. Accelerator mode lies between these two in performance and in interaction with your model.

Note   An exception to this rule occurs when you run multiple simulations, each of which executes in less than one second in Normal mode. For example: for i=1:100 sim(mdl); % executes in less than one second in Normal mode end For this set of conditions, you will typically obtain the best performance by simulating the model in Normal mode.

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Comparing Modes

The following table compares the characteristics of Normal mode, Accelerator mode, and Rapid Accelerator mode.

If you want to...	Then use this mode...
	Normal	Accelerator	Rapid Accelerator
Performance
Run your model in a separate address space
Efficiently run batch and Monte Carlo simulations
Model Adjustment
Change model parameters such as solver type, stop time without rebuilding
Change block tunable parameters such as gain
Model Requirement
Accelerate your model even if C code is not used for all blocks
Support M-file S-function blocks
Permit algebraic loops in your model
Have your model work with the debugger or profiler
Have your model include C++ code
Data Display
Use scopes and signal viewers			See Using Scopes and Viewers with Rapid Accelerator Mode
Use scopes and signal viewers when running your model from the command line

Note   Scopes and viewers do not update if you run your model from the command line in Rapid Accelerator mode.

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Decision Tree

The following decision tree can help you select between Normal mode, Accelerator mode, or Rapid Accelerator mode.

See Comparing Performance to understand how effective the accelerator modes will be in improving the performance of your model.

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Code Regeneration in Accelerated Models

Designing Your Model for Effective Acceleration

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