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How can I perform a live stack trace on a running UNIX applicaiton, and are there any utilities that are useful in digesting the stack trace once its done?
I’m looking to see if any functions are getting called more often than I would have expected them to be – the application works fine, it just recently slowed down and it doesn’t appear that anything else in the system is responsible (no other processes are running with unusual memory/processor usage).
Profiling tools will show what bits of the program are taking up the CPU time. If you have to dig deeper, you may need other tooling. Depending on what species of unix you’re after, the tools will vary, as this is sometimes quite platform specific. This article discusses process monitoring on Linux. Different versions of unix may have different sets of utilities for functions that have to interact with the kernel (e.g. Dtrace for Solaris). Some do work across platforms.