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Parallel Debugging Tools
========================
There are two main categories of tools that can aid in
parallel debugging:
* **Debuggers:** Both serial and parallel debuggers are useful. Serial
debuggers are what most programmers are used to (e.g.,
the GNU debugger, ``gdb``), while
parallel debuggers can attach to all the individual processes in an
MPI job simultaneously, treating the MPI application as a single
entity. This can be an extremely powerful abstraction, allowing the
user to control every aspect of the MPI job, manually replicate race
conditions, etc.
* **Profilers:** Tools that analyze your usage of MPI and display
statistics and meta information about your application's run. Some
tools present the information "live" (as it occurs), while others
collect the information and display it in a post mortem analysis.
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