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23. Debugging
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Debugging
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Contents 23.1 Overview of Debugging Issues
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23.2 Finding a Defect 23.3 Fixing a Defect 23.4 Psychological Considerations in Debugging 23.5 Debugging Tools Obvious and Not-So-Obvious
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Related Topics The software-quality landscape: 20
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Developer testing: 22 Refactoring: 24 DEBUGGING IS THE PROCESS OF IDENTIFYING the root cause of an error and correcting it. It contrasts with testing, which is the process of detecting the error initially. On some projects, debugging occupies as much as 50 percent of the total development time. For many programmers, debugging is the hardest part of programming. Debugging doesn t have to be the hardest part. If you follow the advice in this book, you ll have fewer errors to debug. Most of the defects you will have will be minor oversights and typos, easily found by looking at a source-code listing or stepping through the code in a debugger. For the remaining harder bugs, this chapter describes how to make debugging much easier than it usually is
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23.1 Overview of Debugging Issues
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The late Rear Admiral Grace Hopper, co-inventor of COBOL, always said that the word bug in software dated back to the first large-scale digital computer, the Mark I (IEEE 1992). Programmers traced a circuit malfunction to the presence of a large moth that had found its way into the computer, and from that time on, computer problems were blamed on bugs. Outside software, the word
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23. Debugging
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bug dates back at least to Thomas Edison, who is quoted as using it as early as 1878 (Tenner 1997). The word bug is a cute word and conjures up images like this one:
G23xx01
The reality of software defects, however, is that bugs aren t organisms that sneak into your code when you forget to spray it with pesticide. They are errors. A bug in software means that a programmer made a mistake. The result of the mistake isn t like the cute picture shown above. It s more likely a note like this one:
From: Your Boss To: You RE: Your Job Bug Error
You're Fired!
G23xx02
In this context, technical accuracy requires that mistakes in the code be called errors, defects, or faults.
Role of Debugging in Software Quality
Like testing, debugging isn t a way to improve the quality of your software, per se; it s a way to diagnose defects. Software quality must be built in from the start. The best way to build a quality product is to develop requirements carefully, design well, and use high-quality coding practices. Debugging is a last resort.
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Variations in Debugging Performance
Why talk about debugging Doesn t everyone know how to debug No, not everyone knows how to debug. Studies of experienced programmers have found roughly a 20-to-1 difference in the time it takes experienced programmers to find the same set of defects. Moreover, some programmers find more defects and make corrections more accurately. Here are the results of a classic study that examined how effectively professional programmers with at least four years of experience debugged a program with 12 defects:
Fastest Three Programmers Average debug time (minutes) Average number of defects not found Average number of defects made correcting defects 5.0 0.7 3.0 Slowest Three Programmers 14.1 1.7 7.7
0 KEY POINT
Source: Some Psychological Evidence on How People Debug Computer Programs (Gould 1975).
8 HARD DATA
The three programmers who were best at debugging were able to find the defects in about one-third the time and inserted only about two-fifths as many new defects as the three who were the worst. The best programmer found all the defects and didn t insert any new defects in correcting them. The worst missed 4 of the 12 defects and inserted 11 new defects in correcting the 8 defects he found. But, this study doesn t really tell the whole story. After the first round of debugging the fastest three programmers still have 3.7 defects left in their code, and the slowest still have 9.4 defects. Neither group is done debugging yet. I wondered what would happen if I applied the same find-and-bad-fix ratios to additional debugging cycles. This isn t statistically valid, but it s still interesting. When I applied the same find-and-fix ratios to successive debugging cycles until each group had less than half a defect remaining, the fastest group required a total of 3 debugging cycles, whereas the slowest group required 14 debugging cycles. Bearing in mind that each cycle of the slower group takes almost 3 times as long as each cycle of the fastest group, the slowest group would take about 13 times as long to fully debug its programs as the fastest group, according to my non-scientific extrapolation of this study. Interestingly, this wide variation has been confirmed by other studies (Gilb 1977, Curtis 1981).
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