Launch Specific Benchmark(s)

Use case

A developer is working on a feature that is covered by one or more specific benchmarks/scenarios. He/she would like to execute a rally task with an existing task template file (YAML or JSON) indicating exactly which benchmark(s) will be executed.

Problem description

When executing a task with a template file in Rally, all benchmarks are executed without the ability to specify one or a set of benchmarks the user would like to execute.

Possible solution

• Add optional flag to rally task start command to specify one or more benchmarks to execute as part of that test run.