HP XC System Software User's Guide Version 3.2

6.2.1.7 Debugging Running Applications
As an alternative to the method described in “Debugging an Application”, it is also possible to
"attach" an instance of TotalView to an application which is already running.
1. Compile a long-running application as in “Debugging an Application”:
$ mpicc -g -o Psimple simple.c -lm
2. Run the application:
$ mpirun -srun -n2 Psimple
3. Start TotalView:
$ totalview
4. Select Unattached in the TotalView Root Window to display a list of running processes.
Double-click on the srun process to attach to it.
5. The TotalView Process Window appears, displaying information on the srun process.
Select Attached in the TotalView Root Window.
6. Double-click one of the remote srun processes to display it in the TotalView Process Window.
7. Now you should be able set breakpoints to debug the application.
6.2.1.8 Exiting TotalView
Make sure your job has completed before exiting TotalView. This may require that you wait a
few seconds from the time your job has completed until srun has completely exited.
If you exit TotalView before your job is completed, use the squeue command to ensure that
your job is not still on the system.
$ squeue
If it is still there, use the following command to remove all of your jobs:
$ scancel --user username
To cancel individual jobs, see the scancel manpage for information about selective job
cancellation.
6.2 Debugging Parallel Applications 71