After you click Debug select the launch configuration, the debugger downloads the program to the specific core and the Debug perspective appears. Within the Debug view, the program’s thread appears. The thread is identified by its launch configuration name and the index value of the core that it executes on. If you are source code debugging, the program’s source appears in an editor view.
To debug a specific core's program, click on its thread in the Debug view. The Debug perspective automatically displays the source, registers, and variables for this core. If you click on another thread, the Debug perspective updates all of the views to display that core's context.