This gem depends on parallel_tests. Check it's page for installation instructions.
Gem pspec determines optimal processors count ( OPC ) as
processors count - 1
Add to your Gemfile inside development group.
gem 'pspec'
rake pspecRuns pspec:prepare and pspec:run consequentially.
rake pspec:full_prepareMigrates your database, prepares your test database, clones your test database OPC times.
rake pspec:prepareClones your test database OPC times.
rake pspec:runRuns your specs in parallel using OPC processors.