By David J Agans
Debugging - The nine integral principles for locating Even the main Elusive and software program challenge КНИГИ ; ПРОГРАММИНГ Название: Debugging - The nine crucial ideas for locating Even the main Elusive and software program challenge Автор: David J. Agans Издательство: Amacom Год: 2002 Формат: PDF Язык: английский Страниц: 106 ISBN: 0-8144-7168-4 Размер: 2.48 МбFending off the easiest makes an attempt of expert engineers, defects and software program blunders can stymie the efforts of the tech detectives trying to unscramble them. In Debugging, Dave Agans identifies 9 easy, useful ideas, appropriate to any software program software or process, that could aid discover any malicious program, irrespective of how difficult or obscure..com zero
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Extra resources for Debugging - The 9 Indispensable Rules for Finding Even the Most Elusive Hardware and Software Problem
Spray a hose on the leaky window, not on a different, "similar" one. • Find the uncontrolled condition that makes it intermittent. Vary everything you can—shake it, rattle it, roll it, and twist it until it shouts. • Record everything and find the signature of intermittent bugs. Our bonding system always and only failed on jumbled calls. • Don't trust statistics too much. The bonding problem seemed to be related to the time of day, but it was actually the local teenagers tying up the phone lines.
Therefore, you should be willing to rebuild the software in order to find the bug in the first place. Make a debug version so you can see the source. Add new debug statements to look at the parameters you really need to see. "Quit Thinking and Look," and then, when you've fixed the bug, "#ifdef" all that stuff out and ship production code again. Earlier, I mentioned sending an engineer to the customer site with a taxi−load of instrumentation. Because customer sites are usually production code and it's difficult to build software offsite, field engineers usually have to use add−on or already built−in instrumentation.
Plumbers build instrumentation into the system when they add a temperature gauge to a boiler or a pressure gauge to a water tank. (In the well pump story, if they had checked the well pressure gauge, they would have seen that the pump was just fine. ) To find air leaks in a house, we dangle a ribbon around the window frames and electrical outlets and look for drafts; if we can afford it, we might use an infrared sensor to look for cool spots. When you have a leak in a bicycle tire, you swab soapy water on it and look for the bubbles.