Allinea DDT

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Developer(s)Arm Holdings (formerly Allinea Software Ltd.)
Initial release2002
Stable release
18.3 / November 2018; 5 months ago (2018-11)
Operating systemLinux and Blue Gene/Q. (Windows and macOS for remote client)
Platformx64-64, ARM, PowerPC, Intel Xeon Phi and CUDA
Available inEnglish
LicenceProprietary commercial software

Arm DDT is a commercial C, C++ and Fortran 90 debugger produced by Allinea Software now part of Arm[1] of Warwick, United Kingdom. It is widely used for debugging parallel Message Passing Interface (MPI) and threaded (pthread or OpenMP) programs, including those running on clusters of Linux machines.


It is used to find bugs on both small and large clusters, from 1 to 100,000s of processors. It features memory debugging which detect memory leaks, or reading and writing beyond the bounds of arrays.

It was the first debugger to be able to debug petascale applications - having been used to debug applications running concurrently on 220,000 processes on a Cray XT5 at Oak Ridge National Laboratories.[2][3] This is possible interactively as the debugger's control tree architecture leads to logarithmic performance for most collective operations. Arm DDT uses the GNU Debugger as debug engine.

Arm DDT also supports coprocessor architectures such as Intel Xeon Phi coprocessors[4] and NVIDIA CUDA GPUs.[5]

It is part of Arm Forge - a suite of tools for developing code in high performance computing - which also includes the performance profiler for scalar, multithreaded and parallel codes - Arm MAP.[6]

As of 2011, 80 percent of the world's top 25 supercomputers on the TOP500 list, use Arm's tools.[7]


  1. ^ "How Allinea Helps Scientists Run their Applications Faster and Better". InsideHPC. 5 December 2012.
  2. ^ "Upgrade Adds Muscle to Debugger". Oak Ridge National Laboratories. Archived from the original on 2011-06-23. Retrieved 14 June 2011.
  3. ^ "ORNL, Allinea Prep Debugging Tool for Petascale Supercomputers". Communications of the ACM. 30 July 2010.
  4. ^ "Allinea Releases Tools for Xeon Phi Developers". HPCWire. 13 November 2012. Archived from the original on 2013-03-07. Retrieved 2013-01-15.
  5. ^ "NVIDIA debugging solutions page".
  6. ^ Arm Forge
  7. ^ "Allinea Selected as a Red Herring Top 100 Europe Technology Company". HPCwire. Tabor Communications. 2011-06-01. Archived from the original on 2012-03-14. Retrieved 2013-02-07.

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