Of course I'm in already in trouble. That's why I'm debugging. I tend not to debug things that are working perfectly. If I can't attach a profiler to find, for

Of course I'm in already in trouble. That's why I'm debugging. I tend not to debug things that are working perfectly. If I can't attach a profiler to find, for example, the code that contains a regex that's doing too much backtracking with production data, then I'm dead in the water. If I can't get a sample out of a system that's received a query of death, then I'm dead in the water. If I can't attach dtrace (or the equivalent) and get stats on how much I/O a system is doing in response to various events, I'm dead in the water. Being able to dive into the depths of a system is the #1 criteria for confidently being able to put it into production.