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gem5 bootcamp environment

This repository has been designed for use in gem5 tutorials. It contains:

  • The slides that are used in the bootcamp. The slides are rendered with Marp.
  • The materials directory contains templates code and completed code examples of how to use gem5.
  • The web directory enables the bootcamp to be hosted on GitHub pages.
  • The gem5 directory is a submodule that contains the gem5 source code and gem5-resources is a submodule for gem5-resources.
    • These will usually point to the latest stable release of gem5.

To use this repository, you will need to have a GitHub account and a Codespaces subscription. If you are using this repository as part of the official gem5 bootcamp, you will be provided with a codespace subscription.

To view the bootcamp slides, visit the gem5 bootcamp website.

Contributing

See CONTRIBUTING.md for more information on how to contribute to the gem5 bootcamp.

Using this repository

Note: 'gem5' and 'gem5-resources' are submodules though the .devcontainer/devcontainer.json file specifies that a git submodule update --init --recursive command is executed when the Codespace Docker container is created.

Note: The .devcontainer/on_create.sh script is executed the first time the codespace is created. This will pre-download much of the resources (disk images, etc.) that are used in the gem5 tutorials. It can take a while to do this. A pre-built devcontainer is set up for the bootcamp and should be used to avoid this delay.

The container used by Codespaces is built from Dockerfile. It contains:

  • All gem5 dependencies (inc. optional dependencies).
  • Prebuilt gem5 binaries:
    • /usr/local/bin/gem5-chi (/usr/local/bin/gem5) (gem5 ALL ISAs with CHI protocol)
    • /usr/local/bin/gem5-mesi (default gem5 ALL build with MESI_Two_Level)
    • /usr/local/bin/gem5-vega (x86-only with GPU protocol)
  • A RISCV64 and an AARCH64 GNU cross-compiler:
    • RISCV64 GNU cross-compiler found in /opt/cross-compiler/riscv64-linux/.
    • AARCH64 GNU cross-compiler found in /opt/cross-compiler/aarch64-linux/.

Beginners' example

The following can be used within the Codespace container to run a basic gem5 simulation straight away:

gem5 gem5/configs/example/gem5_library/arm-hello.py

This will execute a "Hello world!" program inside a simulated ARM system.

Updating submodules

In this project we have two submodules: 'gem5' and 'gem5-resources'. These are automatically obtained when the codespaces is initialized. At the time of writing the 'gem5' directory is checked out to the stable branch at v24.0.0.0. The 'gem5-resources' repository is checked out to revision '97532302', which should contain resources with known compatibility with gem5 v24.0.

To update the git submodules to be in-sync with their remote origins (that hosted on our GitHub), execute the following command:

git submodule sync   # Only needed if submodule remotes changed
git submodule update --remote

This repository may be updated to these in-sync submodules by running the following (this assumes you have correct permissions to do so):

git add gem5 gem5-resources
git commit -m "git submodules updated"
git push

Launching a new version of the bootcamp

Steps to create a new instance of the bootcamp.

  1. Create a new repo
  2. Update your local repo with a new remote: git remote add <name> git@github.com:gem5bootcamp/<repo>.git
  3. Create a new branch: git checkout -b <name>
  4. Update repo to enable github actions. Use https://github.com/gem5bootcamp/<repo>/actions
  5. Push new branch to new repo main: git push <name> <name>:main
  6. Track the right upstream: git branch --set-upstream-to=<name>/main
  7. Update splash page
  8. Update Introduction
  9. Enable github pages to "deploy from branch" gh-pages. Use https://github.com/gem5bootcamp/<repo>/settings/pages