Introduction of Debugging
- Submitting an interactive job – Save time by queuing once and running multiple times.
- Using VNC with a Debugger – when displaying an X11 client (e.g., DDT) remotely over the network, interactive response is typically slow. Using the VNC server can often help you improve the situation.
- Arm Forge (formerly Allinea DDT) – a full-featured GUI-based debugging tool supporting scalar, multi-threaded, and large-scale parallel applications.
- ATP – Cray’s Abnormal Termination Processing can generate a merged stack backtrace if your program dies.
- STAT – Generate a merged stack backtrace snapshot while your run is in progress. Useful to diagnose deadlock.
- lgdb – Provides a command-line interface for debugging a parallel application with gdb (the GNU Project Debugger).
Common Debugging Issues
- Determining Memory Use – learn how to use the glibc mallinfo call to get information on used/available memory in your code.