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Scalar: Enabling Git at Scale

Scalar is a tool that helps Git scale to some of the largest Git repositories. It achieves this by enabling some advanced Git features, such as:

  • Sparse-checkout: limits the size of your working directory.

  • File system monitor: tracks the recently modified files and eliminates the need for Git to scan the entire worktree.

  • Commit-graph: accelerates commit walks and reachability calculations, speeding up commands like git log.

  • Multi-pack-index: enables fast object lookups across many pack-files.

  • Incremental repack: Repacks the packed Git data into fewer pack-file without disrupting concurrent commands by using the multi-pack-index.

By running scalar register in any Git repo, Scalar will automatically enable these features for that repo and start running suggested maintenance in the background.

Repos cloned with the scalar clone command use the GVFS protocol to significantly reduce the amount of data required to get started using a repository. By delaying all blob downloads until they are required, Scalar allows you to work with very large repositories quickly. This protocol allows a network of cache servers to serve objects with lower latency and higher throughput. The cache servers also reduce load on the central server.

Installing on macOS

To install Scalar on macOS, download the Installers_macOS_Release.zip from the releases page. Extract the Installers_macOS_Release folder, cd into it, and run ./InstallScalar.sh in a Terminal window. The script may prompt for your password as it installs the following components:

Installing on Windows

To install Scalar on Windows, download the Installers_Windows_Release.zip from the releases page. Extract the Installers_Windows_Release folder, open it in a command prompt, and run InstallScalar.bat. This will install the following components:

  • Getting Started: Get started with Scalar. Includes scalar register, scalar unregister, scalar clone, and scalar delete.

  • Advanced Features: For expert users who want full control of Scalar's activity. Includes scalar run <task>, scalar pause, scalar resume.

  • Troubleshooting: Collect diagnostic information or update custom settings. Includes scalar diagnose, scalar config, scalar upgrade, and scalar cache-server.

  • Frequently Asked Questions