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nce you have completed your application, there are a number of things that you might want to do before finally releasing your code to the world One of the most obvious procedures is to debug your code Despite your best efforts, there are bound to be bugs and problems in your code that you probably didn t realize were there, and certainly never intended to introduce Debugging under Perl can be handled in a number of different ways There are command line switches to output different levels of information, there s the output from the Perl compiler, which can be a useful addition to the debugger s toolkit, and there s even an interactive debugger that you can use to execute and monitor the progress of your Perl script s execution There are also other steps that you need to take before you can release your code Documentation is always a good idea, not only as pointers for your end-users, but also as a tool for you, so that when you go back to the code a few months later, you know what it does, how, and why If your script is a general purpose tool, then you can make it appeal to a larger user group by making it cross-platform aware, and if possible, compatible Knowing which functions, facilities, and systems are available on each platform is a good start, but there are also tricks that you can apply to make the process easier Finally, Perl includes some tools that make the distribution and installation of modules and applications easier Learning how to make the best use of these modules can dramatically increase the ease of use and installation by your end-users The other chapters in this section cover these latter parts of the application development process In this chapter, we re going to concentrate purely on the processes and tools available for debugging and optimizing the applications, scripts, and modules that you write Debugging is a time-consuming and laborious process When I was at college, I was taught that the proper ratio was 80 percent testing and 20 percent development time, and after many years in the programming business, I can affirm that that ratio is about right Even in a very simple piece of code, it s possible to introduce some potential bugs and problems For every bug you find and eliminate, I can guarantee that two more will be waiting in the wings Furthermore, the solution to one bug may well introduce new bugs that you aren t aware of There is, however, more to debugging than simply finding the bugs and squishing them A good programmer will take a more pragmatic approach, and try to develop a system that will trap most of the errors before they cause any problems Remember that the purpose of debugging, and in turn, error trapping, is to ensure that the software does what it is supposed to do, while simultaneously ensuring that it doesn t do anything it shouldn t A simple log-processing script should not delete or corrupt the log in the process, for example We ve already seen some examples of basic error trapping in 9 you should use 9 as a guide to isolating potential problems before they become real ones In this chapter, we ll look at two basic procedures for debugging The second is the use of more simplified debugging processes, such as using print and caller to.

1 Thickness gives the piece a three-dimensional look 2 Remember as you work that lines and objects created in model space cannot be altered in paper space, and vice versa 3 Only paper space allows adjustment and manipulation of multiple viewport plotting Some trial and error may be required to achieve the desired look

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provide a history of a script s execution, and therefore to help you to identify where things have gone wrong The final, but certainly not least important, option that we will look at is the use of the Perl built-in debugger The final stage of any debugging process is probably the one least followed optimization Although many people do not consider it a bug, a badly optimized script is as much a danger as one that overwrites files it shouldn t have access to A simple CGI script that processes a form shouldn t take hours doing so monitoring the execution time can often give you a good idea of where the problems lie Within Perl, there are a few solutions to that particular problem, including an extension to the core debugging extensions, the Perl Profiler This monitors the execution time of each subroutine in your script and gives you an excellent idea of where there could be problems We ll also look at some of the manual techniques available for improving performance, and at some of the more obvious resource sinks that can slow execution It s impossible in a single chapter to cover everything you need to know about trapping errors and debugging For a more detailed look at debugging with Perl, see my Debugging Perl: Troubleshooting for Programmers (Osborne/McGraw-Hill, 2000), from which a lot of the material in this chapter comes See Appendix C for more information

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