Tenstorrent AI User-Mode Driver

Official Repository

https://github.com/tenstorrent/tt-umd

Software Dependencies

UMD requires Tenstorrent's kernel-mode driver

Required Ubuntu dependencies:

sudo apt install -y libhwloc-dev cmake ninja-build

Suggested third-party dependency is Clang 17:

wget https://apt.llvm.org/llvm.sh
chmod u+x llvm.sh
sudo ./llvm.sh 17

IOMMU and Hugepage requirements

To determine whether your system requires hugepage configuration, run the provided script:

./scripts/iommu_detect.sh

Grayskull and Wormhole

1G hugepages are required for shared device/host memory. Techniques for setup:

• Recommended: the tt-system-tools repository contains a .deb package which will configure your system
  • sudo dpkg -i tenstorrent-tools_1.1-5_all.deb
• Alternative: Metal project provides instructions and a script.
• For experts:
  • Put system IOMMU in passthrough mode or disable it
  • Allocate 1 or more 1G hugepages
  • Mount the hugetlbfs at /dev/hugepages-1G (e.g. mount -t hugetlbfs hugetlbfs /dev/hugepages-1G -o mode=777,pagesize=1024M)

Blackhole

If your system IOMMU is enabled, no hugepage setup is required.

Build flow

To build libdevice.so:

cmake -B build -G Ninja
cmake --build build

Tests are build separatelly for each architecture. Specify the ARCH_NAME environment variable as grayskull, wormhole_b0 or blackhole before building. You also need to configure cmake to enable tests, hence the need to run cmake configuration step again. To build tests:

cmake -B build -G Ninja -DTT_UMD_BUILD_TESTS=ON
cmake --build build

To build with GCC, set these environment variables before invoking cmake:

export CMAKE_C_COMPILER=/usr/bin/gcc
export CMAKE_CXX_COMPILER=/usr/bin/g++

Build debian dev package

cmake --build build --target package

# Generates umd-dev-x.y.z-Linux.deb

Integration

UMD can be consumed by downstream projects in multiple ways.

From Source (CMake)

You can link libdevice.so by linking against the umd::device target.

Using CPM Package Manager

CPMAddPackage(
  NAME umd
  GITHUB_REPOSITORY tenstorrent/tt-umd
  GIT_TAG v0.1.0
  VERSION 0.1.0
)

As a submodule/external project

add_subdirectory(<path to umd>)

From Prebuilt Binaries

Ubuntu

apt install ./umd-dev-x.y.z-Linux.deb

Simulator Integration

You can run UMD tests without silicon by following setup instructions here.

For UMD, sample tests can be found in tests/simulation/test_simulation_device.cpp

Pre-commit Hook Integration for Formatting and Linting

As part of maintaining consistent code formatting across the project, we have integrated the pre-commit framework into our workflow. The pre-commit hooks will help automatically check and format code before commits are made, ensuring that we adhere to the project's coding standards.

What is Pre-commit?

Pre-commit is a framework for managing and maintaining multi-language pre-commit hooks. It helps catch common issues early by running a set of hooks before code is committed, automating tasks like:

• Formatting code (e.g., fixing trailing whitespace, enforcing end-of-file newlines)
• Running linters (e.g., clang-format, black, flake8)
• Checking for merge conflicts or other common issues.

For more details on pre-commit, you can visit the official documentation.

How to Set Up Pre-commit Locally

To set up pre-commit on your local machine, follow these steps:

1. Install Pre-commit: Ensure you have Python installed, then run:

   pip install pre-commit

2. Install the Git Hook Scripts: In your local repository, run the following command to install the pre-commit hooks:

   pre-commit install

   This command will configure your local Git to run the defined hooks automatically before each commit.
3. Run Pre-commit Hooks Manually: You can also run the hooks manually against all files at any time with:

   pre-commit run --all-files

Why You Should Use Pre-commit

By setting up pre-commit locally, you can help maintain the quality of the codebase and ensure that commits consistently meet the project's formatting standards. This saves time during code reviews and reduces the likelihood of code formatting issues slipping into the repository.

Since the hooks run automatically before each commit, you don't need to remember to manually format or check your code, making it easier to maintain consistency.

We strongly encourage all developers to integrate pre-commit into their workflow.

Formatting C++ code

Installing clang-format

If you're using an IRD docker, clang-format should be already available. If you don't have clang-format in your working environment, follow the instructions on llvm website for installing it.

Formatting files

If working with VSCode, you can copy the provided default settings:

cp .vscode/default.settings.json .vscode/settings.json

From now on, c++ files will be formatted on save (given that clang-format is available).

Note that if you setup pre-commit hook, the files will be automatically formatted when you commit changes. You can also manually auto format the whole repo using mentioned pre-commit:

   pre-commit run --all-files