DDT

Allinea DDT helps developers fix bugs quickly - from the desktop to the largest supercomputer. The most scalable parallel debugger for debugging MPI and multi-threaded codes, DDT leads the world in performance and usability.

Developer: Allinea Platforms: NEC Nehalem Cluster Category: Debugger License: Commercial Website: Allinea homepage

Usage

DDT is available through modules

module load forge

Note: Do not forget to compile your application with debugging info (-g option)

Examples

Usage on HAWK

To debug a program with ddt on HAWK you have to use the Reverse Connection feature. Therefore first launch ddt on a login node:

module load forge
ddt

Then, you have to execute the program you want to debug in a separate shell either via a job script or an interactive job as follows: Load the forge module in your job script or interactive job and modify your mpirun command line therein

module load forge
ddt --connect mpirun ...

After some time a connection request window will pop up in the ddt GUI. Accept the request and you will get the ddt run window to start debugging.

For more information visit the ARM documentation.

starting the application from inside DDT

Get an interactive job and set up the environment within

module load forge
module load openmpi

Compile your application

mpicc -g your_app.c -o your_app

Start DDT:

ddt your_app

Select the right MPI implementation in the options and run your program.

See also

• Software Development Tools, Compilers & Libraries

External links

• Allinea homepage
• DDT Demos
• DDT User Guide