CUDA on WSL User Guide

The guide for using NVIDIA CUDA on Windows Subsystem for Linux.

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Introduction

Now install the NVIDIA Container Toolkit (previously known as nvidia-docker2). WSL 2 support is available starting with nvidia-docker2 v2.3 and the underlying runtime library ( libnvidia-container = 1.2.0-rc.1).

Windows Subsystem for Linux (WSL) is a Windows 10 feature that enables users to run native Linux command-line tools directly on Windows. WSL is a containerized environment within which users can run Linux native applications from the command line of the Windows 10 shell without requiring the complexity of a dual boot environment. Internally, WSL is tightly integrated with the Microsoft Windows operating system, which allows it to run Linux applications alongside traditional Windows desktop and modern store apps.

Figure 1. CUDA on WSL Overview



With WSL 2 and GPU paravirtualization technology, Microsoft enables developers to run GPU accelerated applications on Windows.

The following document describes a workflow for getting started with running CUDA applications or containers in a WSL 2 environment.
Note: CUDA on WSL 2 is enabled on GPUs starting with the Kepler architecture; however, we recommend running CUDA on WSL 2 on Turing or newer architectures.

Getting Started

Getting started with running CUDA on WSL requires you to complete these steps in order:

Installing Microsoft Windows Insider Program Builds

Install the latest builds from the Microsoft Windows Insider Program

  • Register for the Microsoft Windows Insider Program.

  • Install the latest build from the Dev Channel.

    Note:

    Ensure that you install Build version 20145 or higher. We recommend being on WIP OS 21332 and higher with Linux Kernel 5.4.91+ for the best performance.

    You can check your build version number by running winver via the Windows Run command.

Installing NVIDIA Drivers

  • Download the NVIDIA Driver from the download section on the CUDA on WSL page. Choose the appropriate driver depending on the type of NVIDIA GPU in your system - GeForce and Quadro.

  • Install the driver using the executable. This is the only driver you need to install.

  • The DirectX WSL driver is installed automatically along with other driver components so no additional action is needed for installation. This driver enables graphics on WSL2.0 by supporting DX12 APIs. TensorFlow with DirectML support on WSL will get NV GPU hardware acceleration for training and inference workloads. There are no present capabilities in WSL, hence the driver is oriented towards compute/machine learning tasks. For some helpful examples, see https://docs.microsoft.com/en-us/windows/win32/direct3d12/gpu-tensorflow-wsl.

Note:

Nvidia Localsystem Container Download

Do not install any Linux display driver in WSL. The Windows Display Driver will install both the regular driver components for native Windows and for WSL support.

Note:

NVIDIA is aware of a specific installation issue reported on mobile platforms with the WIP driver 465.12 posted on 11/16/2020. A known workaround will be to disable and reenable the GPU adapter from device manager at system start. We are working on a fix for this issue and will have an updated driver soon.

As an alternative, users may opt to roll back to an earlier driver from device manager driver updates.

Installing WSL 2

This section includes details about installing WSL 2, including setting up a Linux distribution of your choice from the Microsoft Store.

  1. Install WSL 2 by following the instructions in the Microsoft documentation available here.
  2. Ensure you have the latest kernel by clicking “Check for updates” in the “Windows Update” section of the Settings app. If the right update with the kernel 4.19.121+ is installed, you should be able to see it in the Windows Update history. Alternatively, you can check the version number by running the following command in PowerShell:



  3. If you don’t see this update, then in the Windows Update Advanced options, make sure to enable recommended Microsoft updates and run the check again:



  4. If you don’t have the last WSL kernel updated, you will see the following blocking warning upon trying to launch a Linux distribution within WSL 2.



  5. Launch the Linux distribution and make sure it runs in WSL 2 mode using the following command:

Setting up CUDA Toolkit

It is recommended to use the Linux package manager to install the CUDA for the Linux distributions supported under WSL 2. Follow these instructions to install the CUDA Toolkit.

First, set up the CUDA network repository. The instructions shown here are for Ubuntu 18.04. See the CUDA Linux Installation Guide for more information on other distributions.

Now install CUDA. Note that for WSL 2, you should use the cuda-toolkit-<version> meta-package to avoid installing the NVIDIA driver that is typically bundled with the toolkit. You can also install other components of the toolkit by choosing the right meta-package.

Do not choose the cuda, cuda-11-0, or cuda-drivers meta-packages under WSL 2 since these packages will result in an attempt to install the Linux NVIDIA driver under WSL 2.

Running CUDA Applications

Just run your CUDA app as you would run it under Linux! Once the driver is installed there is nothing more to do to run existing CUDA applications that were built on Linux.

A snippet of running the BlackScholes Linux application from the CUDA samples is shown below.

Build the CUDA samples available under /usr/local/cuda/samples from your installation of the CUDA Toolkit in the previous section. The BlackScholes application is located under /usr/local/cuda/samples/4_Finance/BlackScholes. Alternatively, you can transfer a binary built on Linux to WSL 2!

Setting up to Run Containers

This chapter describes the workflow for setting up the NVIDIA Container Toolkit in preparation for running GPU accelerated containers.

Install Docker

Use the Docker installation script to install Docker for your choice of WSL 2 Linux distribution. Note that NVIDIA Container Toolkit does not yet support Docker Desktop WSL 2 backend.

Note: For this release, install the standard Docker-CE for Linux distributions.

Install NVIDIA Container Toolkit

Now install the NVIDIA Container Toolkit (previously known as nvidia-docker2). WSL 2 support is available starting with nvidia-docker2 v2.3 and the underlying runtime library (libnvidia-container >= 1.2.0-rc.1).

For brevity, the installation instructions provided here are for Ubuntu 18.04 LTS.

Setup the stable and experimental repositories and the GPG key. The changes to the runtime to support WSL 2 are available in the experimental repository.

Install the NVIDIA runtime packages (and their dependencies) after updating the package listing.

Open a separate WSL 2 window and start the Docker daemon again using the following commands to complete the installation.

Running CUDA Containers

In this section, we will walk through some examples of running GPU containers in a WSL 2 environment.

Simple CUDA Containers

In this example, let’s run an N-body simulation CUDA sample. This example has already been containerized and available from NGC.

From the console, you should see an output as shown below.

Jupyter Notebooks

In this example, let’s run Jupyter notebook.

After the container starts, you can see the following output on the console.

After the URL is available from the console output, input the URL into your browser to start developing with the Jupyter notebook. Ensure that you replace 127.0.0.1 with localhost in the URL when connecting to the Jupyter notebook from the browser.

If you navigate to the Cell menu and select the Run All item, then check the log within the Jupyter notebook WSL 2 container to see the work accelerated by the GPU of your Windows PC.

Deep Learning Framework Containers

Nvidia-container-toolkit Download

In this example, let’s run a TensorFlow container to do a ResNet-50 training run using GPUs using the 20.03 container from NGC. This is done by launching the container and then running the training script from the nvidia-examples directory.

Let's look at another example from Lesson 15 of the Learning TensorFlow tutorial. In this example, the code creates a random matrix with a given size as input and then does a element wise operation on the input tensor.

The example also allows you to observe the speedup when the code is run on the GPU. The source code is shown below.

Save the code as matmul.py on the host's C drive, which is mapped as /mnt/c in WSL 2. Run the code using the same 20.03 TensorFlow container in the previous example. The results of running this script, launched from the mounted drive C, on a GPU and a CPU are shown below. For simplicity the output is reduced.

The same example is now run on the CPU.

Get started quickly with AI training using pre-trained models available from NVIDIA and the NGC catalog. Follow the instructions in this post for more details.

Changelog

  • 3/23/2021: Resolved issues with nvidia-smi crashing on some systems.
    • NVIDIA Driver for Windows 10: 470.14
    • WIP build: 21332, WSL Linux kernel 5.4.91
  • 3/9/2021
    • WIP OS 21313+ and Linux kernel 5.4.91
    • Do not use WIP OS 21327
  • 1/28/2021: CUDA Toolkit 11.2 support, nvidia-smi, NVML support and critical performance improvements.
    The following software versions are supported with this preview release for WSL 2:
    • NVIDIA Driver for Windows 10: 465.42
    • Recommended WIP build: 21292
  • 12/16/2020: Support for 3060Ti. Fix for installation problems observed in notebooks.
    The following software versions are supported with this preview release for WSL 2:
    • NVIDIA Driver for Windows 10: 465.21
  • 11/16/2020: The following software versions are supported with this preview release for WSL 2:
    • NVIDIA Driver for Windows 10: 465.12
  • 9/23/2020: The following software versions are supported with this preview release for WSL 2:
  • 9/2/2020:
    The following software versions are supported with this preview release for WSL 2:
    • NVIDIA Driver for Windows 10: 460.15
  • 6/19/2020: Updated driver release to address cache coherency issues on some CPU systems, including AMD Ryzen.

    The following software versions are supported with this preview release for WSL 2:
    • NVIDIA Driver for Windows 10: 455.41
  • 6/17/2020: Initial Version.

    The following software versions are supported with this preview release for WSL 2:
    • NVIDIA Driver for Windows 10: 455.38
    • NVIDIA Container Toolkit: nvidia-docker2 (2.3) and libnvidia-container (>= 1.2.0-rc.1)

7.1. New Features

The following new features are included in this release:

  • CUDA Toolkit 11.2 support
  • Critical performance improvements
  • nvidia-smi packaged
  • Full NVML support
  • IPC support

7.2. Resolved Issues

The following issues are resolved in this release:
  • Fixed nvidia-smi issues on some systems.

7.3. Known Limitations

The following features are not supported in this release:

  1. Note that NVIDIA Container Toolkit does not yet support Docker Desktop WSL 2 backend. Use Docker-CE for Linux instead inside your WSL 2 Linux distribution.
  2. nvidia-smi is now supported but in order to use it, please copy it to /usr/bin and set appropriate permissions with the below commands: We will soon provide a better user experience when there is OS support.
  3. CUDA debugging or profiling tools are not supported in WSL 2. This capability will be added in a future release.
  4. cumemmap IPC with fd is now supported. Other Legacy IPC APIs are not yet supported.
  5. Unified Memory is limited to the same feature set as on native Windows systems.
  6. With the NVIDIA Container Toolkit for Docker 19.03, only --gpus all is supported. This means that on multi-GPU systems it is not possible to filter for specific GPU devices by using specific index numbers to enumerate GPUs.
  7. When installing CUDA using the package manager, do not use the cuda, cuda-11-0, or cuda-drivers meta-packages under WSL 2. These packages have dependencies on the NVIDIA driver and the package manager will attempt to install the NVIDIA Linux driver which may result in issues. The NVIDIA Windows 10 driver should be the only driver present in the system.
  8. When running the NGC Deep Learning (DL) Framework GPU containers in WSL 2, you may encounter a message: Note that this message is an incorrect warning for WSL 2 and will be fixed in future releases of the DL Framework containers to correctly detect the NVIDIA GPUs. The DL Framework containers will still continue to be accelerated using CUDA on WSL 2.

7.4. Known Issues

The following are known issues in this release:

  • CUDA on WSL2 is not to be used with the latest Microsoft Windows 10 Insider Preview Build 20226 due to known issues. Please use newer builds >= 20236 or revert to the older build 20221 to use CUDA on WSL2.
  • Warning: Please do not update to WIP OS 21327 if you would like to use WSL with GPU support.

Troubleshooting

Here is a collection of potential errors that you may encounter when using CUDA on WSL 2:

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Container Runtime Initialization Errors

  • In some cases, when running a Docker container, you may encounter nvidia-container-cli : initialization error:
  • This usually indicates that the right Microsoft Windows Insider Preview Builds, WSL 2, NVIDIA drivers and NVIDIA Container Toolkit may not be installed correctly. Use the dxdiag tools from the Run dialog and provide the diagnostic logs to NVIDIA. You can also use the CUDA on WSL 2 Forums to get in touch with NVIDIA product and engineering teams for help.

Notices

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