Why is my Simulink Desktop Real-Time simulation very slow or halts in Windows when Hyper-V is enabled?

I am trying to use Simulink Desktop Real-Time (SLDRT) on my Windows machine, but when I launch the example model "sldrtex_vdp.slx", it runs very slowly, halts, or may even cause a bluescreen.

The following warning message may be prompted: 

Warning: The "Real-Time Synchronization" block has timed out while
trying to synchronize to real-time kernel.

The following warning messages may be shown in Diagnostic Viewer:

Model sldrtex_vdp loaded
A disconnect message was sent to the target 10 seconds ago. Waiting for response.. [6 similar]
Never received disconnect response from target. Disconnecting...
Model sldrtex_vdp unloaded

Additionally, I may see the following error message in MATLAB R2022b and earlier during the kernel installation, or when trying to run a real-time simulation:

The Hyper-V hypervisor has been detected. The Simulink Desktop Real-Time kernel
cannot run in the presence of the hypervisor. Please disable the Hyper-V operating
system component before attempting to use Simulink Desktop Real-Time.

Answer 1

[MathWorks Support Team]

In MATLAB R2022b and earlier, the Simulink Desktop Real-Time (SLDRT) kernel is not compatible with Microsoft® Hyper-V or any features that rely on Microsoft virtualization technology. If Hyper-V is enabled, SLDRT cannot load and start the real-time kernel, and you will see error messages indicating this failure. Disabling Hyper-V is mandatory when using MATLAB R2022b or prior versions.

Starting with MATLAB R2023a and later, the SLDRT kernel includes support for Hyper-V. However, this does not guarantee full compatibility on all systems. In some cases, SLDRT may still fail to run correctly when Hyper-V is enabled. If you encounter issues such as halts, crashes, or kernel load failures, you should disable Hyper-V as a troubleshooting step, even on newer releases.

How to disable Hyper-V:

Disable Hyper-V on your Windows PC by performing the following steps:

1. Find Turn Windows features on or off by using Windows search.

2. Clear the boxes for the following features:

• Hyper-V
• Virtual Machine Platform
• Windows Hypervisor Platform
• Windows Subsystem for Linux

This operation begins the uninstall process.

3. Restart the computer as prompted after the uninstall process completes.

 

Further Troubleshooting:

If the above steps don't help, please see the following MATLAB Answers post for troubleshooting steps:

How do I troubleshoot issues with disabling the Windows Hyper-V feature for SLDRT?