Starting Parallel Tasks

Totalview® User Guide : Part IV: Advanced Tools, Configuration, and Customization : 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

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 369”.