swarm_root

swarm_root refers to the directory where P4 Code Review lives in the filesystem. Depending on how you installed P4 Code Review, the default location could be:

• For a package installation: /opt/perforce/swarm.
• For a tarball installation: wherever you unpacked P4 Code Review. If you are unsure, you could check your web server's configuration to discover where P4 Code Review exists.