Choosing a Simulation Mode
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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