Problem

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Introduction

This article outlines a configuration change to restrict Vmmem.exe's resource usage and improve system performance.

The Vmmem.exe process in Windows manages host resources allocated to virtual machines. When the Windows Subsystem for Linux (WSL) feature is enabled, this process can sometimes consume excessive memory and CPU.

Prerequisites

Windows 10/11 users with Windows Subsystem for Linux (WSL)

Cause

The Vmmem.exe process, responsible for managing resources allocated to virtual machines, can sometimes utilize excessive CPU and memory, particularly when the Windows Subsystem for Linux (WSL) feature is active.

Solution

Steps to Limit Vmmem.exe Resource Usage

1. Create a .wslconfig file:

   • Open a text editor (like Notepad) and create a new file named .wslconfig.
   • Save this file in your user profile directory. This is usually C:\Users\<YourUserName>.

2. Configure resource limits:

   • Add the following lines to the .wslconfig file, adjusting the values as needed for your system:

     [wsl2]
     memory=4GB  # Limits VM memory usage to 4GB
     processors=2  # Limits WSL to 2 virtual processors
     

     • Explanation:

       • memory: Sets the maximum amount of RAM that WSL 2 virtual machines can use.
       • processors: Specifies the number of virtual processors available to WSL 2.

3. Save and apply changes:

   • Save the .wslconfig file.
   • Important: To apply these changes, you need to restart your WSL 2 instances. You can do this by either restarting your computer or by running the following command in PowerShell:

     wsl --shutdown

Outcome

After implementing these configuration changes and restarting your WSL 2 instances, you should observe a reduction in the resource usage of Vmmem.exe. This will free up system resources, leading to improved performance and responsiveness, especially when running virtual machines concurrently with other applications.

Additional Information

• Advanced settings configuration in WSL