Windows Real-Time Target - Serious Lag

I experience serious lag-behind of a minimalistic Simulink model containing only a Real-Time Synchronization Block. As far as I can tell the problem only occurs on our Windows 7 SP1, x64 machine with i7 and 8GB of RAM. Another machine (Win 7, x64, 8GB RAM, i5) does not show this problem.

The model is configured for a 0.1sec sample time, which should be well within the capabilities of the hardware.

The Windows Real-Time Kernel reports version 4.4.0, shipped with MATLAB 2014a.

Answer 1

[Sandip Kumar]

This is something not expected. One possible cause for the slow performance would be the 'CPU Power Management' options in BIOS, which interferes with the real-time kernel hence leading to slow performance.

Disable the power management options specific to your CPU in BIOS options and re-run the Simulink model with the block.

Thanks, Sandip, MathWorks

[Alireza Manzoori]

I am experiencing a similar problem, explained here . Did this solution work?

Answer 2

[Suneesh]

1. Are you using the Synchronization block and running the model in Normal mode? Perhaps you could try the external mode and see if you notice the lag:

http://www.mathworks.com/help/releases/R2014a/rtwin/ug/using-real-time-applications.html

2. When you enable "Show missed ticks port" does it indicate any missed ticks?

[Muhammad Khurram Saleem]

Hi, Iam having the same problem. No of missed ticks stays @ zero. still simulations are running slower than real time .