Starting Parallel Tasks

Totalview® for HPC User Guide : PART IV Advanced Tools and Customization : Chapter 19 Setting Up MPI Debugging Sessions : IBM MPI Parallel Environment (PE) Applications : Starting Parallel Tasks

After you set breakpoints, you can start all of the parallel tasks with the Process Window Group > Go command.

CLI: dfocus G dgo
Abbreviation: G

NOTE >> No parallel tasks reach the first line of code in your main routine until all parallel tasks start.

Be very cautious in placing breakpoints at or before a line that calls MPI_Init() or MPL_Init() because timeouts can occur while your program is being initialized. After you allow the parallel processes to proceed into the MPI_Init() or MPL_Init() call, allow all of the parallel processes to proceed through it within a short time. For more information on this, see "“IBM PE Debugging Tips” on page 413".