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copied!<p>Coverage is important to see which parts of the code <em>have not</em> been run. In my experience it has to be accumulated over multiple use cases, because any single run of the software will only use some of the code.</p> <p>Profiling means different things at different times. Sometimes it means measuring performance. Sometimes it means diagnosing memory leaks. Sometimes it means getting visibility into multi-threading or other low-level activities.</p> <p>When the goal is to improve software performance, by finding so-called "bottlenecks" and fixing them, don't just settle for any profiler, not even necessarily a highly-recommended or venerable one. It is essential to use the kind that gets the right kind of information and presents it to you the right way, because there is a lot of confusion about this. <a href="https://stackoverflow.com/questions/4387895/if-profiler-is-not-the-answer-what-other-choices-do-we-have/4390868#4390868">More on that subject.</a></p> <p>Added: For a coverage tool, I've always done it myself. In nearly every routine and basic block, I insert a call like this: <code>Utils.CovTest("file name, routine name, comment that tells what's being done here")</code>. The routine records the fact that it was called, and when the program finishes, all those comments are appended to a text file. Then there's a post-processing step where that file is "subtracted" from a complete list (gotten by a grep-like program). The result is a list of what <em>hasn't</em> been tested, requiring additional test cases.</p> <p>When not doing coverage testing, <code>Utils.CovTest</code> does nothing. I leave it out of the innermost loops anyway, so it doesn't affect performance much. In C and C++, I do it with a macro that, during normal use, expands to nothing.</p>

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