Can I use Knapsack Pro locally in a development environment?
Knapsack Pro is not designed to be used in a development environment: there are many potential bottlenecks on one machine (CPU/RAM/IO/DB). Not to count, different types of tests require a different mix of resources. So you risk either under-utilizing or saturating resources, which result in suboptimal tests runs.
Knapsack Pro is built from the ground up for your CI where each node is isolated and you are guaranteed a faster test suite execution with each additional parallel node you add. Sky is the limit.
In some cases, you may still want to run multiple test processes on one machine. In such a case, please take a look at Using Knapsack Pro with parallel_tests.