TotalView
[http://www.roguewave.com/products-services/totalview]
is a high-end Unix-oriented debugger
that's particularly important to those working on
parallelization.  Its [scripting] language, rather 
remarkably, is [Tcl].

What is TotalView? [https://computing.llnl.gov/tutorials/totalview/]

    TotalView is a sophisticated software debugger product from Rogue Wave Software, Inc.
    ...and before that, TotalView Technologies, LLC (2007-2009)
    ...and before that, Etnus LLC. (1998-2007)
    ...and before that, Dolphin Interconnect Solutions, Inc. (1996-1998)
    ...and before that, BBN Systems and Technologies, a division of BBN Corporation (1993-1996)   

    Used for debugging and analyzing both serial and parallel programs.

    Especially designed for use with complex, multi-process and/or multi-threaded applications.

    Without question, the most popular HPC debugger to date. 

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[http://docs.hpc.uib.no/hpcdoc/images/0/0f/Tv-full.png]


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