Overview

DDT, the Distributed Debugging Tool is a comprehensive graphical interface designed for the complex task of debugging parallel code. With superior support for Fortran and C/C++ plus the industry's best graphical interface you are in control of your parallel application, whether you are working with 2 processes on a workstation or 1024 or more processes across a high-performance cluster. DDT provides an excellent understanding of your MPI code and a common interface for every compiler, language and MPI distribution.

The DDT distributed debugging interface requires a debugging engine. Absoft's Fx2 debugging engine provides a far richer feature set, superior functionality, and reliability.

• DDT has the industry's best debugger interface for distributed computing: one screen, one button, incredibly intuitive, and no scripting language to learn. A modern re-configurable GUI provides drag-and-drop group creation allowing you to quickly group your processes by task, or troubleshoot a problematic process.
• DDT provides a complete debugging solution for complex parallel programs and offers incredible value for the price
• DDT supports all popular compiler vendors including: Absoft, IBM, gnu, HP, Intel, PGI, and Sun Forte

• Launch MPI jobs from a simple graphical window
• Extensively tested for Scyld, LAM/MPI, MPICH-GM, MPICH p4, MPICH p4-mpd, and others
• Built-in support for all major compilers from Absoft, Portland Group, Intel and GNU
• C, C++, Fortran 77 and Fortran 90/95 support
• Scalar, MPI, and OpenMP thread support
• Automatically analyzes values across processes
• Simple to view data structures/pointers
• Group processes by task with drag and drop
• Instantly view process status at any time
• Inspect multiple variables in a single window: all local variables or variables between selected lines
• Run and step processes in groups, with real-time feedback on their status
• Switch between processes with a single mouse click
• Comprehensive feedback on process positions within code
• Cross-processor comparison features
• Automatic display of project source files, with syntax highlighting
• Color highlights indicate process position in code
• Place breakpoints directly into your code for all or selected processes
• Navigate through your local variables, stack frame and complex data structures with ease
• 3-D visualization for arrays
• Drag-and-drop to create watches, expand pointers and view the contents of multi-dimensional arrays
• Save the contents of arrays or slices of arrays during runtime to CSV files for spreadsheet use

• Versatile array visualization capabilities
• Unrivalled 3-D visualization capabilities
• Zoom, spin and even view in stereo

DDT easily scales with your needs, such as from a simple 2-process project to larger clusters involving 1024 or more processes.

• Support for debugging core-files
• Synchronize button brings all processes to the same point in the code. This is important when all your processes have lots of breakpoints already and the execution path is complex
• Stack align sets the current stack to a common stack, which makes using the cross-process comparison window simpler
• Change the directories used to scan source directories