Bryan O'Sullivan (Mercurial)
Mercurial is a distributed revision control system designed for performance and scalability. Although written in Python, it is faster than most other revision control tools. This paper discusses the techniques used in Mercurial to achieve such high performance, and compares its performance on common operations with three other revision control systems: CVS, Subversion, and Perforce. It also introduces some novel software development techniques that are made possible by Mercurial's high performance.