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CODE is a visual parallel programming system, allowing users to compose sequential programs into a parallel one. The parallel program is a directed graph, where data flows on arcs connecting the nodes representing the sequential programs. The sequential programs may be written in any language, and CODE will produce parallel programs for a variety of architectures, as its model is architecture-independent.

To learn more about using CODE, read the tutorial (under construction).

The CODE system can produce parallel programs for PVM-based networks of machines as well as for the Sequent Symmetry. Other target systems/architectures are under development or planned, including Cray, Sun Sparc MP, and MPI. The system itself runs on Suns (support for other platforms will be based on demand).

• The alpha release of CODE is now available (and it's FREE)! The software is distributed in encrypted form. You must indicate your acceptance of the license agreement and license fee waiver to receive the encryption key by e-mail. (You will need PGP to decrypt it.)
  
  

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  CODE 2.1a2 executable (encrypted) for SunOS
  

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  This is a major new revision of CODE (click here for a screen shot). It features a sophisticated new user-interface which provides many improvements to the previous version of CODE, making it easier and more pleasant to use. Some of the features include a Mac-like interface (à la MacDraw), multiple windows for subgraph editing, a hierarchy browser, an integrated runtime environment and more.



• A CODE Tutorial is now on-line, providing an introduction to using CODE (in construction).

• There is a CODE mailing-list for current (and prospective) CODE users so that they will be notified of releases (and pre-releases), new backends, etc.
To be placed on the CODE mailing list, send mail to emery@cs.utexas.edu.



Related Software

• XCodelib: Component Library System for CODE

Documentation

A CODE Tutorial is now on-line (in construction).

These directories of compressed PostScript files are documentation for the previous version of CODE, but are being made available in lieu of new documentation, which is in the preparation stages. Despite the changes in the user interface, these manuals are still quite useful.

• CODE 2.0 User's Manual
• CODE 2.0 Reference Manual

Department of Computer Sciences
The University of Texas at Austin
Austin, TX 78712-1188

Goal

Group Leader

• Professor James C. Browne

Affiliated Faculty Members

• John S. Werth

Staff and Student Members

• Dwip Banerjee: Dynamic Data Partitioning
• Emery Berger: CODE group systems analyst, CODE 2.1 design and implementation
• Ajita John: Compilation of Constraint Programs

• CODE Alumni

• J. C. Browne, S. I. Hyder, J. Dongarra, K. Moore, P. Newton, "Visual Programming and Debugging for Parallel Computing," IEEE Parallel and Distributed Technology, Spring 1995, Volume 3, Number 1, 1995.

  Compares the visual parallel programming environments HeNCE and CODE 2. (21K)

• J. C. Browne, S. I. Hyder, J. Dongarra, K. Moore, P. Newton, "Visual Programming and Debugging for Parallel Computing", Technical Report TR94-229, Dept. of Computer Sciences, Univ. of Texas at Austin, 1994.

  Compares the visual parallel programming environments HeNCE and CODE 2 (a longer version of the above paper, with more references). (138K)

• S. I. Hyder, "A Unified Approach to Concurrent Debugging", Dissertation, Dept. of Computer Sciences, Univ. of Texas at Austin, 1994.

  Dissertation that describes an approach to concurrent debugging that has been implemented for the CODE 2 environment.(278K)

• S. I. Hyder, J. Werth, and J. C. Browne, "A unified model for concurrent debugging," in Proceedings of the 1993 International Conference on Parallel Processing, IEEE Computer Society, August 1993.

• R. Jain, J. S. Werth, and J. C. Browne, "A general model for scheduling of parallel computations and its application to parallel I/O operations," in Proceedings of 1991 International Conference on Parallel Processing, August 1991.

• M. Kleyn, J.C. Browne, "A High Level Language for Specifying Graph-Based Languages and their Programming Environments", 15th International Conference on Software Engineering, Baltimore MD, April, 1993.

  The PostScript file is an extended version of the above paper.(88K)

• M. Kleyn, "A High Level Language for Specifying Graph-Based Languages and their Programming Environments", Dissertation, Dept. of Computer Sciences, Univ. of Texas at Austin, 1995.

  This dissertation describes a high-level specification language, Glide, for defining integrated graphical/textual programming environments for visual programming languages (those based on directed graph models of computation).(367K)

• P. Newton, "A Graphical Retargetable Parallel Programming Environment and Its Efficient Implementation", Technical Report TR93-28, Dept. of Computer Sciences, Univ. of Texas at Austin, 1993.

  A doctoral dissertation, discussing CODE 2.0 in depth.(700K)

• P. Newton, Delivered paper at Workshop on Environments and Tools for Parallel Scientific Computing, Walland, TN, May 26-27, 1994.

  Short paper on virtues and limitations of HeNCE 2.0 and CODE 2.0 as well as ramblings on processes as visual components.(98K)

• P. Newton and J.C. Browne, "The CODE 2.0 Graphical Parallel Programming Language", Proc. ACM Int. Conf. on Supercomputing, July, 1992.

  This paper describes a prototype implementation of CODE 2. Some of the notations have changed, but the ideas are the same. This paper remains a good broad introduction to CODE because it is brief.(91K)

• J. Werth, J. C. Browne, S. Sobek, T. J. Lee, P. Newton, and R. Jain, "The interaction of the formal and the practical in parallel programming environment development: CODE," Lecture Notes on Computer Science, vol. 589, New York: Springer Verlag, 1992.

• J. S. Werth and L. H. Werth, "Directions in software engineering education," in Proceedings of Thirteenth International Conference on Software Engineering, May 1991.