Google uses Perforce SCM for Version Control

As this job ad for Web Developer at Google suggests, Google is using the Perforce SCM System for version control. Many software companies use Microsoft's Visual SourceSafe for version control. Subversion is another popular version control system. The most well known version control system in the open source community is CVS. ClearCase is still another version control system in wide use. Perforce tries to show its advantage by comparing all those popular version control systems.