LNT is an infrastructure for performance testing. The software itself consists of two main parts, a web application for accessing and visualizing performance data, and command line utilities to allow users to generate and submit test results to the server.
The package was originally written for use in testing LLVM compiler technologies, but is designed to be usable for the performance testing of any software.
The official LNT documentation is available online at: https://llvm.org/docs/lnt
The LNT source is available in the llvm-lnt repository: https://github.com/llvm/llvm-lnt
To get started, please look at the Developer Guide in the official documentation.