Parallel testing would be nice. Theres a bunch of things to do to make it work. See the LEP for constraints/goals/resourcing.

Known bugs/issues: parallel test bugs

Design sketch:

• bin/test --parallel runs N test runners with subunit, where N is the number of cores, and the tests are partitioned across runners.
• Layers dynamically allocate/deallocate resources such as:
  • dbnames
  • config files
  • librarian work dir
  • librarian ports

Things that need specialist knowledge:

• dynamically allocating ports for zope - port 8085 and 9025 specifically, which can then be fed back into e.g. zcml files/launchpad.conf.
• Buildmaster slave tests hard code the xmlrpc port to 8221 everywhere.